misfire or anything. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? Any thoughts or suggestions would be appreciated. Most of the complaints show up in the 2009 to 2011 model years. No it runs fine on sylinder one but not on 6 or 7!!! Lost number four Another General Motors 5.3L V8 Lawsuit Filed | GM Authority My Wifes 17 Buick with afm was my attempt to get back to gm. chevrolet - How does cylinder deactivation work? - Motor Vehicle Just one or two. He unstuck it and I took it for a drive and same thing happened. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! It could be the filter screen under the oil sending unit. It will show up as a misfire code in a cylinders 1,4,6, or 7. This allows the engine to run in V8 mode. What makes you think it was a design flaw ? Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. Clean oil is crucial. Cylinders two, three, and eight are all similar in cylinder deactivation. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? All ready done valve job . AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Then again, it should have never been controlling those solenoids. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Hopefully he can free up the stuck/collapsed lifter. I called my service station and they told me to get it in ASAP. Brian, I have been reading your article about the AFM. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. It has plenty of oil pressure and I put all new lifters in it. I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! Pod. I have no clue what to do now. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? This is what I keep telling people. I would rather stay a V8 full time than deal with AFM issues in the future. I have no other engine problems and Id like to fix the issue. Basically rebuilt most of the engine while in the vehicle. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Your email address will not be published. Most will want to get rid of the AFM immediately and VVT isnt for []. Very expensive repair too! They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Having a hard time finding one .. If I put my truck in manual 5, it doesnt try to go into V4 mode. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Hello. how many miles do you have on your engine? I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. With 40000 GM offers the following diagnostic steps in determining if this is the problem. Shame this happened. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. All eight cylinders are now powering the engine. I speak from some experience. $8500.00 fix. [], [] way. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. hi brian when you replace the lifters do you have to change the guides also? [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? Do you think I can still disable AFM? AFM - active fuel management strategy which deactivates the lifters on specific . I plan on getting a tuner to disable the AFM. The trucks are only supposed to use two four. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . GM claims fuel improvements ranging from 5%-15% depending on the engine. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Would you get enough power to drive at freeway speeds? That might show up if you cut the filter and looked for debris in the pleats. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. If you left the original cam in, the AFM cylinders will be down about 25 lbs. All the time. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. I ran 0W-20 no more the 5000 miles between changes. Having it fixed now, just curious Seems like a problematic design. Or not because it is the cast iron block and not he aluminum block? They lasted one year with big problems. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. There are no changes in the valves or the springs. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Driver reported this occurred suddenly while driving down the highway. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. I recently took a long trip and it burned 1.5 quarts of oil. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. AFM/DFM Disabler - Range Technology However, they are only functional on engines that usedAFM. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Diablo says yes but they do not provide tunes. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Cant believe they havent fixed this in a decade. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. Pushing forward. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso The most common issue GM vehicle owners with AFM report is increased fuel consumption. You cannot compare them to old 350s. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). I wont bother with blocking the relief valve. No problems with any to this point. Learn how your comment data is processed. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. My daughters car had about 230,000 miles when she complained of the problem. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. It also has an electrical connector on the back. Covers me to 100K. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). Can they be faulty? The result is improved combustion chamber pressure as the piston approaches top . Sylinder one lost compression on my 09 5,3. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. In four-cylinder mode, they act like air springs and allow for smooth operation. (Non-AFM engines have a smooth cover.). "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. They may be able to find some of those missing ponies. Its not GMs choice to use AFM. Solenoids, new lifters also test voltage to solenoid pack all good their, Is this an issue only with GM SUVs and trucks, or does it include cars too? Yeh truck has 5237 miles on it Should I wait until the warranty runs out, or will that be too late to stop possible damage? It has AMF. Is this the shield you referred to in a past post? 2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. On one hand it has an aluminum block, which is nice. I am leaning heavily on installing the AFM disabler. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. No movement on the rocker arms. Thanks for the advice Brian! AFM Sucks!!! We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy If under the truck while parked and it is doing it it sounds like it is towards the back of motor. The engine will switch to operating on fewer cylinders when cruising at a constant speed. I call it active obama fuel management .A scam . When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. I dont plan on installing the delete kit at this time. thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? 50,000 miles. I havent has any lifter or cam issues. Just pulled it down in the garage there was no other damage , luckily. I would appreciate it if you let me know how you make out. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. Unfortunately, I found out about the lifters too late. You were lucky that it worked. 5.3-liter Chevy Engine Problems: What Should You Look Out For? what deleter (if thats a real word) have you heard good things about. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. This happened on a camping trip with my kids last friday night. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. []. He used seafoam and changed to synthetic oil. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. The engine has flex-fuel capability. Disable Active Fuel Management - Ricks Free Auto Repair Advice Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus.
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