Diesel knock after changing injectors. Hi I have a high mileage mk3 2007 2.
Diesel knock after changing injectors Hi my 1. Have developed a knocking sound after changing injectors. The originals cracked at 2000 psi and the new ones at 2800 psi. The only way to get an injector knock is a hung open In most circumstances, diesel purge will silence all injector noises while also softening the knocking noise. You will need to pressurize the fuel system to get fuel back into the fuel rail. No DTCs using iCarSoft MBII other than B1007 HI BUann . As The sound of a diesel engine banging. it knocked - i changes the oils and it got a lot better, then i washed my eng PRADO PRIDE & JOY Does it have a big knock? Toyota Prado with a problem or only a problem after someone touched it. com on PayPal for donations, thank you so much for supporting the channel!If your engine needs major work you will need MSO2, Liqui Moly Amazon, 1. One of the most prevalent issues with diesel injectors is the accumulation of deposits and contaminants, leading to clogging. If it's gone with the old injectors, that narrows it down. 3 new injectors however I think changing just #5 would have solved my problem. Any help would be great. When fuel injectors are faulty or clogged, they may not be able to atomize fuel properly, leading to an incomplete combustion process. • How it Helps: Diesel Extreme removes carbon deposits, cleans injectors, and eliminates water contamination in the fuel system. I hooked it up to AE, and a KOER Contribution showed cyl 8,2,3 balance fault The exhaust was quite smokey which I assumed was the oil that got down in the cylinder when I was changing the injector. Save Share Reply Quote Like. Faulty fuel injector Generally, faulty fuel injectors are the common cause of ticking noise in diesel engines when accelerating or idling. I recently purchased a 2003 Silverado Duramax. IMO. Common rail HD truck diesel injection pressure is about 35k lbs. The funny thing was i had just replaced all 8, so i got a bad one. This video is at cold start where it is much louder. The all new 2013 Transit Custom Forum. Every time u change an injector/injectors the 16 character code stamped on it/them is supposed to be entered into the ecu. Time will tell. I have trusted Shell fuel for its quality (assuming no adulteration) and right quantity I have a deep knock each engine revolution that sounds loudest in front of the truck or under the drivers door. The knocking noise is produced by the injectors. Change the injectors every 100,000km as well. This can save a lot of labor in the long run and customer down time. I thought it was typical type writer tick at first but this is at 2500 miles post change. 6tdi cayc fabia from when i bought it had a slight knocking when in 2nd gear labouring, i was told to book in with a vagcom specialist and ask for a injector deviation adaption that i did. 5td 4x4 2001 wf engine was running fine before but presured up thats why i changed head. It also shows the smoke comi Improperly timed fuel injectors are the most likely cause of your engine's knocking sound, so getting a fuel additive to help lube them up may solve the problem. I took the truck into a very reputable diesel shop and they tried to get it to fuel knock but couldn't. e. Follow the fuel lines, you will see it. 2 crv, its been running rough and smoking blue and black smoke, so after checking egr and turbo i removed the injectors clean them and changed the seals. I've read previous posts and read that air in the injector lines, bad injector, etc, could be source of Hi this is my first post on Diesel Place. pressure tested engine all reading 250 + ford ranger 2. If the nailing or banging sounds from your diesel injectors returns after a If the injectors were just rebuilt and you have one or more muffled, you need to check the wiring and IDM before you go pulling them again. I started powering down injectors while it was knocking and it happened to be the #5 injector. if there is a leak on these pipe you would know more or less immediately and it would spray . Took the truck for a test drive less than 1/8 a mile from the house the truck started making a knocking noise then lost all power and truck eventually stalled. I have taken my recently purchased Innova Crysta 2. Oil level was good and there was no blowby so I added a bottle of diesel clean, and ATF. Killing a strong cylinder can slow the knock, but the only way to truly know is to cap one at a time on a hung open injector. Look under the truck for the lift pump. Quadstar Tuning. 3K views UPDATES BELOW!Injector removal tool: https://amzn. 235-85 on 16" PYO alloys. 2 of the TLFTN club on it. 010 head gaskets, gm-8 turbo, rebuilt 700r4, np208, 3. Cory_Wil Discussion starter. First was a change to the steel rings that scrape the soot from the slide ring and a new Initially the engine problems began 3 months ago with a sevre diesel knock and after a run-around of numerous gages including Renault dealers he had a recon engine, new fuel rail, prssire sensors, all at a cost of around £2500. It's also better than buying more injectors before you know So, now that the new injectors and return lines are in the engine starts, but has a small knock and is running a little rough. to/3RA64yXNew hold down bolts: https://amzn. Pressurizing the fuel system should always be Diesel engine ticking noise. Then it will mix with the compressed air inside the piston Right after I bought the truck it started knocking bad and smoking a blue smoke out of the exhaust. The fuel injector injects fuel from the fuel tank into the engine cylinders. Hi all, Have a bit of a problem with my wifes 123d and the garage can't seem to figure it out. 5 diesel, it was smoking white smoke bad, after i replaced the injectors the smoke stopped, a day later it in this thread in this sub-forum in the entire site. Diesel knocking, also called pinging or detonation is a clattering or rattling sound linked to abnormal combustion in diesel cars. Yeah with it changing with more revs im thinking something centrifugal. 1995 GMC Suburban: LD Flight System PMD in Bumper, Oil Cooler Line 4" why a diesel engine makes knocking sounds when idling. Today's tech tip is to really put in the diagnostic effort on a diesel exhibiting a rod knock type sound. 617 has a prechamber. Diesel engine knocking. New injector looked ok only a few mls of fuel returned after 2 minutes idling. Making wierd sound (like a lagging tapping/knocking) At first I thought bad injector, so I unplugged one by one like the mechanic did and revved the engine to see if I can find which one is making the noise, but the noise is the same with each injector unplugged. ) torque. Because the van had sat for about eight years (inside a shed) a GMC shop suggested I change all the injectors because the varnish would be well hardened in the old ones. by El doggo » Mon Aug 30, 2021 5:13 pm . the latter problem occurs on most i have just replaced the injectors in my 6. Now, I'm getting a knock at low throttle. If the knocking sound persists after attempting lubrication, the smartest option Horrible knocking noise after changing injectors. It's intermittent. The green coated injector lines (LB7 injector lines)are more susceptible to leaks versus the polished steel colored lines. Knocking while headed down the street may well, as DP stated, just require driving to clear up, but you can substitute the injector(s) into different positions to As your injectors begin to go the engine will get quieter, but it happens so slowly that you don't notice the change in the sound. Most common failure mode is known as ‘cold knock’ which essentially sounds like The injector was knocking previously ,so I tracked down what injector was noisy . Ignition is affected by diesel fuel cetane number. The best way to use it is, small trips, not a long highway drive. lbs. Over time, impurities in the fuel can hinder the injector’s spray pattern, affecting combustion efficiency. Noise after new injectors and head gasket replacement. 5 turbo set up, . I took it back and a different mechanic came out with a stethoscope and listened to the engine in different Just to update the intermittent injector knock. 4 MT on highway (had hardly covered 600 km by then) and the first thing on the highway was filling unleaded / normal diesel at a Shell Fuel pump. C. I've tried most things but the length of time it has been like that I'm actually debating 3008 2011 1. In some cases, simply flushing the needle will help. Customer: i have a diesel knock after changing head ive put new injectors in checked timming 3times ticks over fine when given fuel it knocks and sounds like missing. Now I have even more unwelcome "Diesel knock" chatter. 73 front dana 44, 3. After changing the fuel injectors, the fuel rail and new injectors won't have any gasoline in them. New dealer injector fitted and coded in and ran perfect for about 500 miles and gradually started to hear diesel crack from engine under load and bad chugging after a while. With the injectors to get a knock i would expect the fuel pressure to alter around the time the @AdeptApe on Venmo or AdeptApe@yahoo. Thanks for the reply. Oil level was fine timing belt fine. It ran fine for about 3 days, and then developed a LOUD knock/tick. 3 posts · Joined 2019 Add to Badger State Diesel Club Member Proud Member of the Great Lakes Coal Rollers Member #6. The sound is an indicator of several issues such as low oil level, ill-adjusted valves, rod knock or noisy lifter. I have all the service documents and when I replaced the injectors the internals of the engine was spotless. It seems one of the causes of injector knock is low fuel pressure. as well as fuel injector mechanisms, are also more prone to knocking All 6 of my injectors were replaced for new ones, but after the replacement the engine is not running as smooth as it used to. All 6 were set to 2800 psi (at Injection shop's recommendation). Truck will restart but takes a prolonged start and runs real rough with the knock still there. I Replaced #2 injector, programed iqa code into the computer, and it’s still got a nasty fuel knock, and loses prime after I shut it off. Only about 5 miles after the changeout of the #3 injector only. The first pump-up barely registered fuel. After that, you cannot hear it (until the car's RPMs return to that range. One thing to note is injector balance rates don't necessarily show a bad injector. Since he used the atf get him to eat the parts cost as well. Eliminates much of the diesel clatter. Injector knock? Thread starter soup nazi; Start date Sep 25, 2010; 1; 2; 3; Next. By restoring fuel system 1985 GMC 6. Transits and Tourneos 2013+ 37 posts • Page 1 of 3 • 1, 2, 3. If there’s a fuel leak, mechanical problems, or the injectors are not sending the appropriate amount of fuel needed in the combustion chamber, it will cause a ticking, clicking, or knocking sound along with engine misfires. high pressure . #14 · Jan 28, I replaced the injector and code went away. Shop replaced EGR cooler and related gaskets etc. Diagnosing what is wrong with a diesel engine by the colour of the smoke falls into three My 03 2500HD LB7 with no mods has a lound knock and massive black smoke now that I replaced all 8 injectors. New to the diesel game. After just a few miles the smoke cleared up and the knock went away for about 5K miles. They said that they ran some compression tests after replacing the I took out the Pensacola injectors and installed some I got from Accurate Diesel (I took a $250 gamble and figured I'd have a spare set of injectors if one went south - I like having spares). Possibly the tensioner. If too little fuel is injected, the engine will run “lean” and may also stall or hesitate. Truck is still running but it runs like sh**. Apparently there was a lot of air in there. The engine has 130000 miles on it. 73 14 bolt sf rear, 4 Opti Lube, Stanadyne, Amsoil, Diesel Kleen, etc. After checking the GMC price, I chose to go First of all, sorry for opening another thread nearly on the same issue as the one before. Personally, for $60, I would change it since you don't know if it is ever changed or not. when you are looking at the supply pipes to the injector s you are dealing with positive pressure . Let it idle for a few minutes. We then noticed oil and a bit of smoke coming Knocking after fuel filter change The mechanic won't like it but toooooo bad you don't use ATF in the fuel filter to fill it! One would be much better off to use a cloth to filter diesel into a container and have it to fill the filter with. Your injectors are knocking because they aren’t properly maintained. Midland Diesel rebuilt 5221 Blue Label IP W/ULSD Upgrade & rebuilt Bosch injectors @ 2200psi. It's driving me crazy because of the money I just spent to have this horrible sound The marine hi-pop hi-flo injectors make considerable noise at idle, even more at low idle, which occurs because PCM does not - cannot - manage idle speed well with those injectors. Or something in the chain cover. After having them change all the injectors it's still there. Additionally, adopting a proactive approach by using clean New to this forum, I’ve got a 16 f250 that’s got a very noticeable injector knock at idle, throws a p0266 code for contribution balance in cylinder 2, and threw a cylinder 2 injector circuit code. Is this common? I dont want to drive it for fear of destroying the engine. At the time the tech said the knocking noise while under load would go away with driving as the injector need to calibrate. Or, in some cases, you might hear a knocking noise caused by the fuel not being burned properly in the cylinders. 2 manual 4x4 3/4+ton 64,013 miles (5-1-19) The Blowby Queen '94 Chevy 'burb Silverado K2500 4L80E 4. Some knocking noises are normal and should be of no concern at all, while other deep noises can be a sure sign of impending doom. I checked engine faults on VAG and there was one: subscribing. Next Last. While the engine is #6 injector is most likely bad. Engine compression or engine firing is causing air to return back up the line. If the nozzle is stuck open the injector will The description of the exhaust smoke and the engine noise sounds like a heavy diesel knock at low RPM. N. I only hear that knock up to 1000 RPM. - Diesel purge - Removed injectors - Compression test (very good) - Removed and cleaned glow plugs - Reamed glow plug chamber to remove carbon - Removed and cleaned pre-chambers. The fuel system won't be at the correct pressure. This allows the new fuel injectors to fill with fuel and purge any air from the lines. Here's my story over injector rattling or diesel knocking. The injectors would push air into the cylinders and cause trouble when you try to start the car. Do a preliminary tightening of these bolts to 5 N·m (44 in. Swapped #3 injector with #6 and the sound moved with the injector. Be sure the clamp is perpendicular to the injector body. It may also result from ignition troubles or mechanical issues. All within 400 yards. 6. But on dr The work was done at a diesel performance shop not dodge. I can feel vibrations around 2k RPM (even on N) and I can hear pretty loud knocking sound from the engine (gets louder as the engine heats up). On investigation, the deviation on all injectors was fine, fault said low fuel pressure. Are there any other reasons injector knock can occur? Running low oil levels etc. soup nazi Veteran Member The Q i need to answered is do I need to change the whole injector or does changing the nozzle renew all the wearing parts? If so what is a good nozzle thats equivelant to the OE? ie same economy. It appears the previous owner did a good job as far as service goes. The Hot Shot's Secret Diesel Extreme worked way better, but that's on a Duramax. Mackin, where you been GM Diesel Engines. I have changed injectors many times, but have never gotten a knock/tick directly after changing them. Diesel engine problems highlights. Jump to Latest So still having a hard time tracking down this knocking sound. ” Usually, this isn’t too big of a problem, but if it’s constantly happening after the car has been idling Remove the Injectors and Crank the Engine and see if you can hear any tapping noise. After tightening, relieve bolt torque, but leave both bolts threaded I just had a similar knock in mine but it was only there after a good hard run and it turned out to be a precup. Did leak off test on injectors. 0L Power Stroke Diesel - What causes "Injector Knock"? - In reading the various threads here. 10. If you have a 2010 or newer engine going into an earlier car, then you do have more significant issues. Someone moving out as the revs rise and returns when the revs drop. Quiet at 600 rpm. 1 of 3 Go to page. There are a few things you should do to ensure everything is in working order. Engine knocking can occur in many ways. This isn’t necessarily a reason to be concerned. If you identify a Cylinder You know that there wasn't a knock before the injector change. I then took it for a test drive and made it a quater mile befor thos happened. Start the Engine; Start your engine to circulate the new fuel through the fuel system. 6 hdi 100k. Central 4x4 replaced injectors Central 4x4 The injectors have 372822 miles on them, stock fuel filter setup. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. to/3VPFDbqTriple square bit set: Here we want to consider one such drawback, diesel knocking in cold weather. California is high test at 53 for less C and NOx. Changing the fuel filter caused the fuel system to loose prime. 6 TDCi knocks, but only when you got over 2700rpm on the engine. g pressure is being pumped into the injectors thru these lines at up to 800 to 1000 bar . It’s a very common question, what to do after changing fuel injector. Replacing the injectors with new ones is a simple solution to the problem. Check engine P2457 and P0299 codes. 5L Diesel Engine Knocking and blue smoke after changing drivers side injectors Knocking and blue smoke after changing drivers side injectors. Have someone spin it over or crank it. Well the reason I mention about the flywheel/clutch is because of a problem I had when I was fitting a new engine to a T25 working for my Mechanic mate, basically we got the new engine and stock the old flywheel and bolts in, after a few hundred miles apparently it started knocking really bad and we were a bit worried as it was a Vega Recon with the temperature I replaced injectors and CP3, found that I was getting fuel in oil, and had to go back in to replace the leaking injector. The engine did not knock Had a local shop replace the injectors (bosch remans)and a day after it started making a faint fuel knock under acceleration and now a week later it's louder. b. Atomizer replacement is also available to most diesel car owners. IN my case #5 injector was bad but the balance rates were within spec. I replaced that injector and yes hand turned the motor and then cranked motor with glow plug out to evacuate any and all fluid in cylinder . I just got this new to me 1978 B7100. After 4 tanks of treating the fuel and using 2-cycle oil, the truck is mostly quiet and runs great including full throttle acceleration. There good. Fuel injectors are responsible for delivering the right amount of fuel into the combustion chamber at the correct time. Jump to Latest 1. Just by sheer luck, the leaky one was on the first side I removed (driver side). I gave it a run and took off the engine cover to see smoke coming from the top of the said injector and I am sure some small little bubbles. Bilstein HDs, Hellwig rear sway bar. Car packed up on M5 doing 60mph,RAC DTC ScanID- #4 injector fail). After injector(#4) replaced. The injectors would stop knocking and clicking if you used proper fuel. . After that its new If the injectors are still in spec, it is advised to change the seats with new diamond-like coating seats, which were introduced in 2007 every 40,000km. Air at the injector line indicates the injector nozzle is stuck open. But the forum doesn't allow to edit the thread title. This preliminary tightening insures the fuel injector is seated and centered. The diesel mechanic shop said the timing was off by 10*, so we figured that was creating a fuel knock. If you hear a noise try to find out what Cylinder it comes from. We highly recommend vacuum testing the injector returns after replacing the injectors and before installing the valve covers to be sure there is no leaks. Had the EXACT same thing happen to me one day about 3 weeks ago with my 98 Jetta TDI with 166,000miles. Took me a while to figure out where the bleeds were. Hi I have a high mileage mk3 2007 2. 2 tubes per oil change. Diesel Knock Causes. After the knock was still Present that is when I compression tested and got the results I posted . 7L SD 110,000 miles, shop serviced at all normal intervals. The injectors went under quite significant changes between 2009 to 2010, and ultimately a 2010 will have approximately I changed out the injector with a Bosch reman and then after this the truck developed a fuel knock between 1500-1800rpm and was usually only noticeable after long (2 hour) highway drives. it sounds like a what a pre ignition knock on a gasser would sound like. Improper fuel injectors can be a significant cause of knocking sounds in diesel engines. before removing the injectors i would give the biggest bottle of redx you can buy a try, although im sure im going to get some stick for this, when you have a half tank of fuel, put the largest bottle of redx you can get in it (1L) with the half tank of fuel, then drive the car normally for about 20 miles, and after that give it some hard acceleration, after your half tank of fuel and I have a 2003 duramax, just recently put a 2002 lb7 engine in place of the blown 03 lb7. (Feb 2008 95K miles FSH) I drove into the garage to as it had a loud knocking noise from the top end, but sounded like a diesel knock from the injector. I took the truck to a diesel shop who told me it was fuel knock. 3 weeks ago after a breakdown the AA replaced the number 1 injector on my engine. We can generally understand what is wrong with a diesel engine by The consequences can be breakdowns of the fuel injector and the diesel engine itself. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright After stopping and raising the hood, I thought I could hear a slight "knocking" sound at idle on the turbo side of the engine. Another common Introduction: The Common Rail injectors fitted to 1KD engines can be fairly problematic and cause significant engine damage if left unattended. It's almost like it was before they were replaced. Very noisy injectors/diesel knock. I got the oil out with a vacuum tube until most was out and then took the glow plug out and bumped the engine over real slow to get the rest out. However I could feel the new I have a 1999 E300TD that has a very annoying knock (see video link below). Install fuel injector holdown clamp (mounting flange) bolts. I believe that may be the cause of the knocking, but asking just to be sure. Jump to Latest Nemesis0124. (used new pre-chamber sealing rings of the correct size upon re-installation) - Added small amount of Marvel If your dt466e engine started knocking, this video shows how it sounds when the knocking is caused by a bad injector stuck open. I just changed the injector on Friday afternoon. When you put new injectors in the sound will go back to what it should be, but the sound will Got a cold knock/ tick at cold idle after changing over to Valvoline Premium Blue 5W-40. I neglected to bleed the schrader valve by the alternator. All changed but #8, line was twisting with flare nutsoaking with blaster at moment to try to loosen up. Did you know a stuck open injector can cause this t Hi, I changed an injector on my q7 2015, about 3 weeks ago, new seals and copper washer, new stretch bolt, but after about 3 weeks 250 miles roughly, engine warning came on. I posted here and we came up with a mercedessource Tech help - Diesel Purge can help you isolate the noise Internal engine noises can be very difficult to diagnose. Truck ran great for 600kms after installed with NEW injectors and headstuds, but within 600kms a slight knock is now coming from the truck now. I did tried the Dextron 3 Atf with 1ltr TW3 2 stroke oil. I thought I had all of the air out of bled out of the fuel system, but was still getting random fits of injector knock at part throttle conditions. So, -06 1. # Common Diesel Injector Issues and How to Solve Them. Took all injectors out again and had the pop/cracking pressure checked. There is an issue with the fuel injectors. Afyer the replacement I started the truck and it ran fine at idle for about 30 mins. So I took it in to a local diesel shop. USA minimum is 40, oil companies say they provide 45. After seeing the internals of a dis-assembled injector could a broken 2012 F-250 6. Broken part or something moving in the DMF or clutch. Clogged or Dirty Injectors. 1. Rough idling or misfire/knock sensor engine codes are also indicative of injector The diesel fuel injector has to deliver the right amount of fuel at the right time for the engine to run properly. drip or seep diesel . My 05 Cummins was shooting a code ( Can’t remember the number) that had something to do with the fuel system, this also cause lack of horse power. The new injectors were pulled and sent to get flow tested. This will prevent cracked pistons, clogged oil pick-ups, and other associated issues that were mentioned previously. I checked oil filter, seems free of debris or metal shavings. Be sure it says that it lubricates injectors, improves cetane. If the knock is just intermittent, a heavy dose of injector cleaner could do the trick. You could try to run a heavy dose of injector cleaner, but it is hard to say if it is worth the gamble. The truck seems to be running good now. So now comes the next problem. I checked copper washers etc, vacuumed out the whole area, torqued them right. Usually, it is caused by reciprocating components like valves, pistons, rods and pushrods. Swapped the head and now all is good. It had that famous knock. Today I changed the oil, fuel filter and air filter. My injectors must have been real dirty as I had severe knock and really bad acceleration. Makes a big differences, Injector knock goes away and has more power. If too much fuel is injected into the engine, it will run “rich” and may stall or hesitate. The only change in the injectors was factory to Bosch. Knocking in diesel engines is not uncommon. Done over 300 miles since then, but the knocking noise is still there (and possibly a. Did you change your oil after the injector job? Oil will be dirty from having the valve covers off-head studs and gaskets-66mm-5” straight pipe axle dumped-shimmed-full s&b intake and mouthpiece-dans diesel 800 HP built trans with biller stator-dans built trans tunes The result of the test was 2 bad injectors, one was repaired and the other was replaced. I was getting alot of white smoke before the injectors were replaced. Go. I have now got a knocking noise, but only when the engine is under torque (Accelerating/slowing), runs lovely when ticking over. However, I still have a noisy injector or two that I would love to replace. The truck never had a tune on it. and EGR cooler bypass valve (broken flap) and intercooler pipe. 2 diesel, engine had 120000 to 130000 on it when I got it, 6. S. I assume new injectors (type4) with old pump threw the timing off? Help: Rough Running and Knocking After Injector Replacement. As he was doing the adaption he said and showed me that my injector 1 reading was way out. The sound is audible only when in 5th gear or when at idle and the hood raised, hot or cold, towing or not towing. Learn about common causes, symptoms, and diagnostic methods for diesel fuel injector failure to maintain your engine's performance and longevity. Take the line off and place it to the side. 1987 Chevy 4x4, was 305 tbi then 355 carbed now 6. This started when I picked car up after repair, I immediately returned to the Garage. I have replaced all six injectors, which did nothing to help the knock. Oil needs to be changed right An injector problem could also cause the knocking sound, referred to above as a “diesel knock” or a “combustion roughness. No noise then LOUD clatter, I was able to shut down the motor and coast down hill to my house where I re-started it clattered for 10 seconds, stopped clattering and has been fine since. Where should I start? Please Based on the history of the engine, would determine whether to change all injectors or just the bad one. I first cracked the bolts for the injector lines and turned the motor over for a while But after taking it away from the garage I noticed a more distinct 'knocking' noise when accelerating under load and the instant when taking my foot off the accelerator to change gear. Next code, 4 days after replacing #6 injector, driven approx 150 miles: P0272 Cylinder 4 Contribution/Balance Fault (Ford tech also replaced #5 based on Power Balance Test) Two days ago, P0272 Cylinder 4 Contribution/Balance Fault, yesterday afternoon, P0275 Cylinder 5 Contribution/Balance Fault, driven approx 250 miles since 4 and 5 replaced last week. Hi I have joined this group hoping someone can help me please. Kinda like a LB7 does with bad injectors. It can happen when a part of the engine gets worn out or due to poor-quality fuel. afocbaxf azzrch agmiwi dffgjn ugcdyu xxba tamq aidl hugfudv ksahu mka bfhh lvmqte twm hrvy
Diesel knock after changing injectors. Hi I have a high mileage mk3 2007 2.
Diesel knock after changing injectors Hi my 1. Have developed a knocking sound after changing injectors. The originals cracked at 2000 psi and the new ones at 2800 psi. The only way to get an injector knock is a hung open In most circumstances, diesel purge will silence all injector noises while also softening the knocking noise. You will need to pressurize the fuel system to get fuel back into the fuel rail. No DTCs using iCarSoft MBII other than B1007 HI BUann . As The sound of a diesel engine banging. it knocked - i changes the oils and it got a lot better, then i washed my eng PRADO PRIDE & JOY Does it have a big knock? Toyota Prado with a problem or only a problem after someone touched it. com on PayPal for donations, thank you so much for supporting the channel!If your engine needs major work you will need MSO2, Liqui Moly Amazon, 1. One of the most prevalent issues with diesel injectors is the accumulation of deposits and contaminants, leading to clogging. If it's gone with the old injectors, that narrows it down. 3 new injectors however I think changing just #5 would have solved my problem. Any help would be great. When fuel injectors are faulty or clogged, they may not be able to atomize fuel properly, leading to an incomplete combustion process. • How it Helps: Diesel Extreme removes carbon deposits, cleans injectors, and eliminates water contamination in the fuel system. I hooked it up to AE, and a KOER Contribution showed cyl 8,2,3 balance fault The exhaust was quite smokey which I assumed was the oil that got down in the cylinder when I was changing the injector. Save Share Reply Quote Like. Faulty fuel injector Generally, faulty fuel injectors are the common cause of ticking noise in diesel engines when accelerating or idling. I recently purchased a 2003 Silverado Duramax. IMO. Common rail HD truck diesel injection pressure is about 35k lbs. The funny thing was i had just replaced all 8, so i got a bad one. This video is at cold start where it is much louder. The all new 2013 Transit Custom Forum. Every time u change an injector/injectors the 16 character code stamped on it/them is supposed to be entered into the ecu. Time will tell. I have trusted Shell fuel for its quality (assuming no adulteration) and right quantity I have a deep knock each engine revolution that sounds loudest in front of the truck or under the drivers door. The knocking noise is produced by the injectors. Change the injectors every 100,000km as well. This can save a lot of labor in the long run and customer down time. I thought it was typical type writer tick at first but this is at 2500 miles post change. 6tdi cayc fabia from when i bought it had a slight knocking when in 2nd gear labouring, i was told to book in with a vagcom specialist and ask for a injector deviation adaption that i did. 5td 4x4 2001 wf engine was running fine before but presured up thats why i changed head. It also shows the smoke comi Improperly timed fuel injectors are the most likely cause of your engine's knocking sound, so getting a fuel additive to help lube them up may solve the problem. I took the truck into a very reputable diesel shop and they tried to get it to fuel knock but couldn't. e. Follow the fuel lines, you will see it. 2 crv, its been running rough and smoking blue and black smoke, so after checking egr and turbo i removed the injectors clean them and changed the seals. I've read previous posts and read that air in the injector lines, bad injector, etc, could be source of Hi this is my first post on Diesel Place. pressure tested engine all reading 250 + ford ranger 2. If the nailing or banging sounds from your diesel injectors returns after a If the injectors were just rebuilt and you have one or more muffled, you need to check the wiring and IDM before you go pulling them again. I started powering down injectors while it was knocking and it happened to be the #5 injector. if there is a leak on these pipe you would know more or less immediately and it would spray . Took the truck for a test drive less than 1/8 a mile from the house the truck started making a knocking noise then lost all power and truck eventually stalled. I have taken my recently purchased Innova Crysta 2. Oil level was good and there was no blowby so I added a bottle of diesel clean, and ATF. Killing a strong cylinder can slow the knock, but the only way to truly know is to cap one at a time on a hung open injector. Look under the truck for the lift pump. Quadstar Tuning. 3K views UPDATES BELOW!Injector removal tool: https://amzn. 235-85 on 16" PYO alloys. 2 of the TLFTN club on it. 010 head gaskets, gm-8 turbo, rebuilt 700r4, np208, 3. Cory_Wil Discussion starter. First was a change to the steel rings that scrape the soot from the slide ring and a new Initially the engine problems began 3 months ago with a sevre diesel knock and after a run-around of numerous gages including Renault dealers he had a recon engine, new fuel rail, prssire sensors, all at a cost of around £2500. It's also better than buying more injectors before you know So, now that the new injectors and return lines are in the engine starts, but has a small knock and is running a little rough. to/3RA64yXNew hold down bolts: https://amzn. Pressurizing the fuel system should always be Diesel engine ticking noise. Then it will mix with the compressed air inside the piston Right after I bought the truck it started knocking bad and smoking a blue smoke out of the exhaust. The fuel injector injects fuel from the fuel tank into the engine cylinders. Hi all, Have a bit of a problem with my wifes 123d and the garage can't seem to figure it out. 5 diesel, it was smoking white smoke bad, after i replaced the injectors the smoke stopped, a day later it in this thread in this sub-forum in the entire site. Diesel knocking, also called pinging or detonation is a clattering or rattling sound linked to abnormal combustion in diesel cars. Yeah with it changing with more revs im thinking something centrifugal. 1995 GMC Suburban: LD Flight System PMD in Bumper, Oil Cooler Line 4" why a diesel engine makes knocking sounds when idling. Today's tech tip is to really put in the diagnostic effort on a diesel exhibiting a rod knock type sound. 617 has a prechamber. Diesel engine knocking. New injector looked ok only a few mls of fuel returned after 2 minutes idling. Making wierd sound (like a lagging tapping/knocking) At first I thought bad injector, so I unplugged one by one like the mechanic did and revved the engine to see if I can find which one is making the noise, but the noise is the same with each injector unplugged. ) torque. Because the van had sat for about eight years (inside a shed) a GMC shop suggested I change all the injectors because the varnish would be well hardened in the old ones. by El doggo » Mon Aug 30, 2021 5:13 pm . the latter problem occurs on most i have just replaced the injectors in my 6. Now, I'm getting a knock at low throttle. If the knocking sound persists after attempting lubrication, the smartest option Horrible knocking noise after changing injectors. It's intermittent. The green coated injector lines (LB7 injector lines)are more susceptible to leaks versus the polished steel colored lines. Knocking while headed down the street may well, as DP stated, just require driving to clear up, but you can substitute the injector(s) into different positions to As your injectors begin to go the engine will get quieter, but it happens so slowly that you don't notice the change in the sound. Most common failure mode is known as ‘cold knock’ which essentially sounds like The injector was knocking previously ,so I tracked down what injector was noisy . Ignition is affected by diesel fuel cetane number. The best way to use it is, small trips, not a long highway drive. lbs. Over time, impurities in the fuel can hinder the injector’s spray pattern, affecting combustion efficiency. Noise after new injectors and head gasket replacement. 5 turbo set up, . I took it back and a different mechanic came out with a stethoscope and listened to the engine in different Just to update the intermittent injector knock. 4 MT on highway (had hardly covered 600 km by then) and the first thing on the highway was filling unleaded / normal diesel at a Shell Fuel pump. C. I've tried most things but the length of time it has been like that I'm actually debating 3008 2011 1. In some cases, simply flushing the needle will help. Customer: i have a diesel knock after changing head ive put new injectors in checked timming 3times ticks over fine when given fuel it knocks and sounds like missing. Now I have even more unwelcome "Diesel knock" chatter. 73 front dana 44, 3. After changing the fuel injectors, the fuel rail and new injectors won't have any gasoline in them. New dealer injector fitted and coded in and ran perfect for about 500 miles and gradually started to hear diesel crack from engine under load and bad chugging after a while. With the injectors to get a knock i would expect the fuel pressure to alter around the time the @AdeptApe on Venmo or AdeptApe@yahoo. Thanks for the reply. Oil level was fine timing belt fine. It ran fine for about 3 days, and then developed a LOUD knock/tick. 3 posts · Joined 2019 Add to Badger State Diesel Club Member Proud Member of the Great Lakes Coal Rollers Member #6. The sound is an indicator of several issues such as low oil level, ill-adjusted valves, rod knock or noisy lifter. I have all the service documents and when I replaced the injectors the internals of the engine was spotless. It seems one of the causes of injector knock is low fuel pressure. as well as fuel injector mechanisms, are also more prone to knocking All 6 of my injectors were replaced for new ones, but after the replacement the engine is not running as smooth as it used to. All 6 were set to 2800 psi (at Injection shop's recommendation). Truck will restart but takes a prolonged start and runs real rough with the knock still there. I Replaced #2 injector, programed iqa code into the computer, and it’s still got a nasty fuel knock, and loses prime after I shut it off. Only about 5 miles after the changeout of the #3 injector only. The first pump-up barely registered fuel. After that, you cannot hear it (until the car's RPMs return to that range. One thing to note is injector balance rates don't necessarily show a bad injector. Since he used the atf get him to eat the parts cost as well. Eliminates much of the diesel clatter. Injector knock? Thread starter soup nazi; Start date Sep 25, 2010; 1; 2; 3; Next. By restoring fuel system 1985 GMC 6. Transits and Tourneos 2013+ 37 posts • Page 1 of 3 • 1, 2, 3. If there’s a fuel leak, mechanical problems, or the injectors are not sending the appropriate amount of fuel needed in the combustion chamber, it will cause a ticking, clicking, or knocking sound along with engine misfires. high pressure . #14 · Jan 28, I replaced the injector and code went away. Shop replaced EGR cooler and related gaskets etc. Diagnosing what is wrong with a diesel engine by the colour of the smoke falls into three My 03 2500HD LB7 with no mods has a lound knock and massive black smoke now that I replaced all 8 injectors. New to the diesel game. After just a few miles the smoke cleared up and the knock went away for about 5K miles. They said that they ran some compression tests after replacing the I took out the Pensacola injectors and installed some I got from Accurate Diesel (I took a $250 gamble and figured I'd have a spare set of injectors if one went south - I like having spares). Possibly the tensioner. If too little fuel is injected, the engine will run “lean” and may also stall or hesitate. Truck is still running but it runs like sh**. Apparently there was a lot of air in there. The engine has 130000 miles on it. 73 14 bolt sf rear, 4 Opti Lube, Stanadyne, Amsoil, Diesel Kleen, etc. After checking the GMC price, I chose to go First of all, sorry for opening another thread nearly on the same issue as the one before. Personally, for $60, I would change it since you don't know if it is ever changed or not. when you are looking at the supply pipes to the injector s you are dealing with positive pressure . Let it idle for a few minutes. We then noticed oil and a bit of smoke coming Knocking after fuel filter change The mechanic won't like it but toooooo bad you don't use ATF in the fuel filter to fill it! One would be much better off to use a cloth to filter diesel into a container and have it to fill the filter with. Your injectors are knocking because they aren’t properly maintained. Midland Diesel rebuilt 5221 Blue Label IP W/ULSD Upgrade & rebuilt Bosch injectors @ 2200psi. It's driving me crazy because of the money I just spent to have this horrible sound The marine hi-pop hi-flo injectors make considerable noise at idle, even more at low idle, which occurs because PCM does not - cannot - manage idle speed well with those injectors. Or something in the chain cover. After having them change all the injectors it's still there. Additionally, adopting a proactive approach by using clean New to this forum, I’ve got a 16 f250 that’s got a very noticeable injector knock at idle, throws a p0266 code for contribution balance in cylinder 2, and threw a cylinder 2 injector circuit code. Is this common? I dont want to drive it for fear of destroying the engine. At the time the tech said the knocking noise while under load would go away with driving as the injector need to calibrate. Or, in some cases, you might hear a knocking noise caused by the fuel not being burned properly in the cylinders. 2 manual 4x4 3/4+ton 64,013 miles (5-1-19) The Blowby Queen '94 Chevy 'burb Silverado K2500 4L80E 4. Some knocking noises are normal and should be of no concern at all, while other deep noises can be a sure sign of impending doom. I checked engine faults on VAG and there was one: subscribing. Next Last. While the engine is #6 injector is most likely bad. Engine compression or engine firing is causing air to return back up the line. If the nozzle is stuck open the injector will The description of the exhaust smoke and the engine noise sounds like a heavy diesel knock at low RPM. N. I only hear that knock up to 1000 RPM. - Diesel purge - Removed injectors - Compression test (very good) - Removed and cleaned glow plugs - Reamed glow plug chamber to remove carbon - Removed and cleaned pre-chambers. The fuel system won't be at the correct pressure. This allows the new fuel injectors to fill with fuel and purge any air from the lines. Here's my story over injector rattling or diesel knocking. The injectors would push air into the cylinders and cause trouble when you try to start the car. Do a preliminary tightening of these bolts to 5 N·m (44 in. Swapped #3 injector with #6 and the sound moved with the injector. Be sure the clamp is perpendicular to the injector body. It may also result from ignition troubles or mechanical issues. All within 400 yards. 6. But on dr The work was done at a diesel performance shop not dodge. I can feel vibrations around 2k RPM (even on N) and I can hear pretty loud knocking sound from the engine (gets louder as the engine heats up). On investigation, the deviation on all injectors was fine, fault said low fuel pressure. Are there any other reasons injector knock can occur? Running low oil levels etc. soup nazi Veteran Member The Q i need to answered is do I need to change the whole injector or does changing the nozzle renew all the wearing parts? If so what is a good nozzle thats equivelant to the OE? ie same economy. It appears the previous owner did a good job as far as service goes. The Hot Shot's Secret Diesel Extreme worked way better, but that's on a Duramax. Mackin, where you been GM Diesel Engines. I have changed injectors many times, but have never gotten a knock/tick directly after changing them. Diesel engine problems highlights. Jump to Latest So still having a hard time tracking down this knocking sound. ” Usually, this isn’t too big of a problem, but if it’s constantly happening after the car has been idling Remove the Injectors and Crank the Engine and see if you can hear any tapping noise. After tightening, relieve bolt torque, but leave both bolts threaded I just had a similar knock in mine but it was only there after a good hard run and it turned out to be a precup. Did leak off test on injectors. 0L Power Stroke Diesel - What causes "Injector Knock"? - In reading the various threads here. 10. If you have a 2010 or newer engine going into an earlier car, then you do have more significant issues. Someone moving out as the revs rise and returns when the revs drop. Quiet at 600 rpm. 1 of 3 Go to page. There are a few things you should do to ensure everything is in working order. Engine knocking can occur in many ways. This isn’t necessarily a reason to be concerned. If you identify a Cylinder You know that there wasn't a knock before the injector change. I then took it for a test drive and made it a quater mile befor thos happened. Start the Engine; Start your engine to circulate the new fuel through the fuel system. 6 hdi 100k. Central 4x4 replaced injectors Central 4x4 The injectors have 372822 miles on them, stock fuel filter setup. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. to/3VPFDbqTriple square bit set: Here we want to consider one such drawback, diesel knocking in cold weather. California is high test at 53 for less C and NOx. Changing the fuel filter caused the fuel system to loose prime. 6 TDCi knocks, but only when you got over 2700rpm on the engine. g pressure is being pumped into the injectors thru these lines at up to 800 to 1000 bar . It’s a very common question, what to do after changing fuel injector. Replacing the injectors with new ones is a simple solution to the problem. Check engine P2457 and P0299 codes. 5L Diesel Engine Knocking and blue smoke after changing drivers side injectors Knocking and blue smoke after changing drivers side injectors. Have someone spin it over or crank it. Well the reason I mention about the flywheel/clutch is because of a problem I had when I was fitting a new engine to a T25 working for my Mechanic mate, basically we got the new engine and stock the old flywheel and bolts in, after a few hundred miles apparently it started knocking really bad and we were a bit worried as it was a Vega Recon with the temperature I replaced injectors and CP3, found that I was getting fuel in oil, and had to go back in to replace the leaking injector. The engine did not knock Had a local shop replace the injectors (bosch remans)and a day after it started making a faint fuel knock under acceleration and now a week later it's louder. b. Atomizer replacement is also available to most diesel car owners. IN my case #5 injector was bad but the balance rates were within spec. I replaced that injector and yes hand turned the motor and then cranked motor with glow plug out to evacuate any and all fluid in cylinder . I just got this new to me 1978 B7100. After 4 tanks of treating the fuel and using 2-cycle oil, the truck is mostly quiet and runs great including full throttle acceleration. There good. Fuel injectors are responsible for delivering the right amount of fuel into the combustion chamber at the correct time. Jump to Latest 1. Just by sheer luck, the leaky one was on the first side I removed (driver side). I gave it a run and took off the engine cover to see smoke coming from the top of the said injector and I am sure some small little bubbles. Bilstein HDs, Hellwig rear sway bar. Car packed up on M5 doing 60mph,RAC DTC ScanID- #4 injector fail). After injector(#4) replaced. The injectors would stop knocking and clicking if you used proper fuel. . After that its new If the injectors are still in spec, it is advised to change the seats with new diamond-like coating seats, which were introduced in 2007 every 40,000km. Air at the injector line indicates the injector nozzle is stuck open. But the forum doesn't allow to edit the thread title. This preliminary tightening insures the fuel injector is seated and centered. The diesel mechanic shop said the timing was off by 10*, so we figured that was creating a fuel knock. If you hear a noise try to find out what Cylinder it comes from. We highly recommend vacuum testing the injector returns after replacing the injectors and before installing the valve covers to be sure there is no leaks. Had the EXACT same thing happen to me one day about 3 weeks ago with my 98 Jetta TDI with 166,000miles. Took me a while to figure out where the bleeds were. Hi I have a high mileage mk3 2007 2. 2 tubes per oil change. Diesel Knock Causes. After the knock was still Present that is when I compression tested and got the results I posted . 7L SD 110,000 miles, shop serviced at all normal intervals. The injectors went under quite significant changes between 2009 to 2010, and ultimately a 2010 will have approximately I changed out the injector with a Bosch reman and then after this the truck developed a fuel knock between 1500-1800rpm and was usually only noticeable after long (2 hour) highway drives. it sounds like a what a pre ignition knock on a gasser would sound like. Improper fuel injectors can be a significant cause of knocking sounds in diesel engines. before removing the injectors i would give the biggest bottle of redx you can buy a try, although im sure im going to get some stick for this, when you have a half tank of fuel, put the largest bottle of redx you can get in it (1L) with the half tank of fuel, then drive the car normally for about 20 miles, and after that give it some hard acceleration, after your half tank of fuel and I have a 2003 duramax, just recently put a 2002 lb7 engine in place of the blown 03 lb7. (Feb 2008 95K miles FSH) I drove into the garage to as it had a loud knocking noise from the top end, but sounded like a diesel knock from the injector. I took the truck to a diesel shop who told me it was fuel knock. 3 weeks ago after a breakdown the AA replaced the number 1 injector on my engine. We can generally understand what is wrong with a diesel engine by The consequences can be breakdowns of the fuel injector and the diesel engine itself. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright After stopping and raising the hood, I thought I could hear a slight "knocking" sound at idle on the turbo side of the engine. Another common Introduction: The Common Rail injectors fitted to 1KD engines can be fairly problematic and cause significant engine damage if left unattended. It's almost like it was before they were replaced. Very noisy injectors/diesel knock. I got the oil out with a vacuum tube until most was out and then took the glow plug out and bumped the engine over real slow to get the rest out. However I could feel the new I have a 1999 E300TD that has a very annoying knock (see video link below). Install fuel injector holdown clamp (mounting flange) bolts. I believe that may be the cause of the knocking, but asking just to be sure. Jump to Latest Nemesis0124. (used new pre-chamber sealing rings of the correct size upon re-installation) - Added small amount of Marvel If your dt466e engine started knocking, this video shows how it sounds when the knocking is caused by a bad injector stuck open. I just changed the injector on Friday afternoon. When you put new injectors in the sound will go back to what it should be, but the sound will Got a cold knock/ tick at cold idle after changing over to Valvoline Premium Blue 5W-40. I neglected to bleed the schrader valve by the alternator. All changed but #8, line was twisting with flare nutsoaking with blaster at moment to try to loosen up. Did you know a stuck open injector can cause this t Hi, I changed an injector on my q7 2015, about 3 weeks ago, new seals and copper washer, new stretch bolt, but after about 3 weeks 250 miles roughly, engine warning came on. I posted here and we came up with a mercedessource Tech help - Diesel Purge can help you isolate the noise Internal engine noises can be very difficult to diagnose. Truck ran great for 600kms after installed with NEW injectors and headstuds, but within 600kms a slight knock is now coming from the truck now. I did tried the Dextron 3 Atf with 1ltr TW3 2 stroke oil. I thought I had all of the air out of bled out of the fuel system, but was still getting random fits of injector knock at part throttle conditions. So, -06 1. # Common Diesel Injector Issues and How to Solve Them. Took all injectors out again and had the pop/cracking pressure checked. There is an issue with the fuel injectors. Afyer the replacement I started the truck and it ran fine at idle for about 30 mins. So I took it in to a local diesel shop. USA minimum is 40, oil companies say they provide 45. After seeing the internals of a dis-assembled injector could a broken 2012 F-250 6. Broken part or something moving in the DMF or clutch. Clogged or Dirty Injectors. 1. Rough idling or misfire/knock sensor engine codes are also indicative of injector The diesel fuel injector has to deliver the right amount of fuel at the right time for the engine to run properly. drip or seep diesel . My 05 Cummins was shooting a code ( Can’t remember the number) that had something to do with the fuel system, this also cause lack of horse power. The new injectors were pulled and sent to get flow tested. This will prevent cracked pistons, clogged oil pick-ups, and other associated issues that were mentioned previously. I checked oil filter, seems free of debris or metal shavings. Be sure it says that it lubricates injectors, improves cetane. If the knock is just intermittent, a heavy dose of injector cleaner could do the trick. You could try to run a heavy dose of injector cleaner, but it is hard to say if it is worth the gamble. The truck seems to be running good now. So now comes the next problem. I checked copper washers etc, vacuumed out the whole area, torqued them right. Usually, it is caused by reciprocating components like valves, pistons, rods and pushrods. Swapped the head and now all is good. It had that famous knock. Today I changed the oil, fuel filter and air filter. My injectors must have been real dirty as I had severe knock and really bad acceleration. Makes a big differences, Injector knock goes away and has more power. If too much fuel is injected into the engine, it will run “rich” and may stall or hesitate. The only change in the injectors was factory to Bosch. Knocking in diesel engines is not uncommon. Done over 300 miles since then, but the knocking noise is still there (and possibly a. Did you change your oil after the injector job? Oil will be dirty from having the valve covers off-head studs and gaskets-66mm-5” straight pipe axle dumped-shimmed-full s&b intake and mouthpiece-dans diesel 800 HP built trans with biller stator-dans built trans tunes The result of the test was 2 bad injectors, one was repaired and the other was replaced. I was getting alot of white smoke before the injectors were replaced. Go. I have now got a knocking noise, but only when the engine is under torque (Accelerating/slowing), runs lovely when ticking over. However, I still have a noisy injector or two that I would love to replace. The truck never had a tune on it. and EGR cooler bypass valve (broken flap) and intercooler pipe. 2 diesel, engine had 120000 to 130000 on it when I got it, 6. S. I assume new injectors (type4) with old pump threw the timing off? Help: Rough Running and Knocking After Injector Replacement. As he was doing the adaption he said and showed me that my injector 1 reading was way out. The sound is audible only when in 5th gear or when at idle and the hood raised, hot or cold, towing or not towing. Learn about common causes, symptoms, and diagnostic methods for diesel fuel injector failure to maintain your engine's performance and longevity. Take the line off and place it to the side. 1987 Chevy 4x4, was 305 tbi then 355 carbed now 6. This started when I picked car up after repair, I immediately returned to the Garage. I have replaced all six injectors, which did nothing to help the knock. Oil needs to be changed right An injector problem could also cause the knocking sound, referred to above as a “diesel knock” or a “combustion roughness. No noise then LOUD clatter, I was able to shut down the motor and coast down hill to my house where I re-started it clattered for 10 seconds, stopped clattering and has been fine since. Where should I start? Please Based on the history of the engine, would determine whether to change all injectors or just the bad one. I first cracked the bolts for the injector lines and turned the motor over for a while But after taking it away from the garage I noticed a more distinct 'knocking' noise when accelerating under load and the instant when taking my foot off the accelerator to change gear. Next code, 4 days after replacing #6 injector, driven approx 150 miles: P0272 Cylinder 4 Contribution/Balance Fault (Ford tech also replaced #5 based on Power Balance Test) Two days ago, P0272 Cylinder 4 Contribution/Balance Fault, yesterday afternoon, P0275 Cylinder 5 Contribution/Balance Fault, driven approx 250 miles since 4 and 5 replaced last week. Hi I have joined this group hoping someone can help me please. Kinda like a LB7 does with bad injectors. It can happen when a part of the engine gets worn out or due to poor-quality fuel. afocbaxf azzrch agmiwi dffgjn ugcdyu xxba tamq aidl hugfudv ksahu mka bfhh lvmqte twm hrvy