gm cylinder deactivation problems

I had privilege to work on some of that garbage they never did work . Does the Pressure relief vavle ever go bad?? Having it fixed now, just curious Seems like a problematic design. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. The engine is running on only four cylinders. 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Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. However, the fuel savings are not always as much as expected. You will get codes thrown if the afm is physically removed without telling the ECM you did so. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. New plugs and wires. 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 plan on getting a tuner to disable the AFM. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. Love the truck. AFM - active fuel management strategy which deactivates the lifters on specific . From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. lol. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. Should I wait until the warranty runs out, or will that be too late to stop possible damage? General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. The 2016+ Tacomas are junk. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. The engine had 200K miles. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. I have no clue what to do now. 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? These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Im curious as to how much tran fluid you put in? Would it be fine to go ahead with the AFM Disabler? . I recently bought a low mileage 2013 Silverado and the lifters collapsed. Ditto , never buy a throw away vehicle again is my recommendation and my fix . In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Runs better than new now and no more oil consumpsion!! A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Looking to tear down myself. It is being covered under warranty since I only have 72,000 miles on it. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. 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. 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. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. TheAFMcylinders are opposite of one another in the firing order. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. 2 15 with 5.3 Sierras both with 100k and The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? Verified over hundreds of trips, makes no sense. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Replaced all lifters. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. This new lawsuit is essentially identical to the previous. Will this AFM DISABLER damage anything???. Toyota will be my next truck unless GM owns up and makes wright with consumers. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps. Hi Grant is that disabler still working for you ? $8500.00 fix. I ordered a electronic disabler for it today. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. There is a chance the cam lobe was stressed and started to deteriorate. Wed recommend a call to our partners at Summit Racing. Accept i only have 60K on my truck and it hasnt recovered. Changing the sensor didnt help. More information can be found in the GM TSB bulletin number 10-06-01-008g. Just shut AFM off. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Constant engine and transmission problems. I will be installing the AFM deactivator tonight when I get hoe. Do not pay that amount. AFMlifters have a history of failing and oil consumption can be a problem. I noticed this discussion mainly addresses Chevy Silverados and other trucks? 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. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. I have been assuming this is just a slow to pump-up lifter or lifters. []. On the AFM lifters that dosnt work i have installed them With the oil hole Down! GM get a clue! The car runs great apart from the shuddering at those speeds. I have a 2011 GMC with over 162,000 miles on it and it runs great! 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. Next day, fired it up to take the the junk yard and it ran great. Since the tranny oil worked, you should now change the oil, right? That inherently less smooth operation requires additional NVH dampening. 1981 Cadillac V 864. Just one. It has 8,000 miles on it. The engine also had 799 or 243 casting heads which are closely related to the LS6. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. I have a 12 wit 4.8 Silverado 75000 miles [], [] as the LS engine familys hybrid engine in trucks and SUVs. Todays computers are faster so it does work. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. I ave noticed the point about excess oil spray. I havent has any lifter or cam issues. All Cylinders. This basically deactivates the cylinder deactivation system. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Its Chrysler and Ford. It also mentions a valve cover replacement with revised PCV valve design. 190k on the motor always ran AMSOIL full synth since new. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Getting ready to diy for $450. . Most will want to get rid of the AFM immediately. Have there been improvements in more recent model years employing AFM [2014 or newer]? Would you get enough power to drive at freeway speeds? I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. The exhaust valve remains open during the intake stroke and closes just before BDC. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. The 2nd went with a conventional valvetrain. Hopefully more is known by then. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). I just bought a 2018 Silverado. I am trying to prevent same issue. It does seem that when they start goingthey go quickly. I wont bother with blocking the relief valve. Some drivers want V8 power under their foot at all times. Toyota has their own problems. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. Whats the next step? what deleter (if thats a real word) have you heard good things about. Nine plaintiffs filed the General . They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. All eight cylinders are now powering the engine. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. If you ignore it and keep driving, odds are you will destroy the cam as well. If I put my truck in manual 5, it doesnt try to go into V4 mode. I have a 2012 Chevy Avalanche. I recently took a long trip and it burned 1.5 quarts of oil. I have the towing package on my 13 Tahoe LTZ. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? Does the disabler prevent the engine damage in the first place? Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. The most common issue GM vehicle owners with AFM report is increased fuel consumption. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Once the lifter has been damaged, the cam is probably also damaged. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Id wait until the warranty expires then disable. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. With 40000 Cylinders two, three, and eight are all similar in cylinder deactivation. What the biggest reported problem with Chevy Silverados? Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Don't even get me started on the shortened life of the cooling, starting and charging systems. Not sure what else it can be. Its got a hundred forty-five thousand miles on it. I have a 2013 1500 with the LC9. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. It has plenty of oil pressure and I put all new lifters in it. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? Any thoughts or suggestions would be appreciated. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. 50,000 miles. GM should recall every vehicle with this terrible design flaw! Fortunately, the old engine hadnt been shipped back to the remanufacturer. Can I (should I) also change to a standard volume oil pump? I always have done my oil changes on time, not sure about the people who owned it before me though. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? How long did it take? I tried the trans fluid in the oil. Is this due to the AFM being shut off? 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). of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 2011 Chevy Avalanche LTZ. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. This should be added to your earlier model if you experience oil consumption. How did your turn out? In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. They are taller and have special oil holes. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? 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! It came back on last Wednesday starting with a flash. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Brian, I have the same question as Scott. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! Because its not just GM that have engine problems. The oil is baked on to every component. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Theyre also notorious for bad cam tower oil leaks. I ran 0W-20 on more the 5000 miles between changes. Any problems to watch out for?Did you replace the VLOM? Easier said than done. Engines with AFM use a high-volume oil pump. so the trans fluid worked for you then? This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? We believe this confirmed that the AFM has never been operating in this vehicle. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. Everything was fine for two weeks, ow customer complains s it same noise it made as before. CHANGE YOUR OIL!!!!! Hello! This allows the engine to run in V8 mode. Drives way better for my mostly paved road driving. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I did noticed the oil consumption but it was rare that I would have to add oil.