gm cylinder deactivation problems

[] they have a downside? The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. The motor I pulled was a 2007 LY5 with about 77k on it. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. Your email address will not be published. 1981 Cadillac V 864. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I am having that done today on my 08 Suburban and its only costing me $225. 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. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. 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 materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I got the AMF disabler anyway and so far so good. I went with the new motor for the warranty. 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. They lasted one year with big problems. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Remembered that after I bought my Tahoe. Also putting in a new transmission vs. rebuilding. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Our 2013 yukon with 47k miles just failed. I told her to never pull the gadget out. Getting ready to diy for $450. How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Open to suggestions about best course of action. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. This system is the most effective way to disable AFM. The only solution is to replace the entire cylinder head. How do you know if the lifter has failed? It is also known as Displacement on Demand (DoD) or cylinder deactivation. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. My 2002 I had over 298K on it with no engine related issues. It came back on last Wednesday starting with a flash. A 17 with 5.3. 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. I have a 07 Yukon with 180K and no issues what so ever. Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. Engine oil pressure is fine. Im always sorry to hear when people run into issues like these. It only has about 9k miles on it. any help? I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. She started to have the lifter problem again after 60,000 miles more. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. What the biggest reported problem with Chevy Silverados? 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. 2011 Chevy Avalanche LTZ. Runs better than new now and no more oil consumpsion!! I would just have the AFM disabled (tuned out) then. I am confused about the plug in disabler. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Most of the complaints show up in the 2009 to 2011 model years. I recently bought a low mileage 2013 Silverado and the lifters collapsed. I couldnt agree with you less, yet I respect your opinions. Thank you. Next day, fired it up to take the the junk yard and it ran great. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Regardless of the AFM solenoid being commanded on or off. Since the tranny oil worked, you should now change the oil, right? Would doing the disabler option once I get it back be the right one? . 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. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. Most of all, my concern is reliability. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. I havent has any lifter or cam issues. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. The engine will switch to operating on fewer cylinders when cruising at a constant speed. After reading these forums Im a little concerned about my decision to stay with GM. bought at Brian Tooley Racing ! I cant really tell from driving. Ill Never Ever buy another gm. Truck has an active P0300 code and runs very rough. It also has an electrical connector on the back. If the 4th cylinder lifter has failed, would driving it damage the engine? I am hoping this does the trick. Thanks for the detailed post! NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. Now Im here tring to figure out what to do. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. GM uses 3 different styles all are engine specific. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. 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? On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Some guys have been able to use a tool through the top with the cover off to get it to release. With 44, its a enormous Jon to remove the oil pan. There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. I loved this rtuck until this happened!! Does cylinder deactivation affect engine life? - Quora I just got new warranty engine and dont want this issue again? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. Do not pay that amount. Only thing I noticed with the oil consumption issue. Hopefully more is known by then. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). If buying a tuner/chip which works best for that truck/engine? Dont drive it if you have a dead cylinder due to afm failure. Does the disabler prevent the engine damage in the first place? Junk . Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. It works . Took it to a shop and they advised that it could be due to the AFM system not functioning properly. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . 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??? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Shame this happened. Definitely dont want to do anything to fix one problem and create another. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? Can I (should I) also change to a standard volume oil pump? Sylinder one lost compression on my 09 5,3. Diablo says yes but they do not provide tunes. In four-cylinder mode, they act like air springs and allow for smooth operation. I have a 2013 1500 with the LC9. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. I had one fail and it chattered the cam to the point that I had to Install a new cam. Required fields are marked *. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Its a CA EMMISIONS TRUCK. They layed over night in engine oil before instalation. I just bought a 2018 Silverado. Any truth to that? 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. 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver Hello. Any help would be appreciated. As you said, the ECM was never seeing the AFM so I think youre good to go. Its got a hundred forty-five thousand miles on it. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . There is a good chance that some of the drivers side lifters decided to go. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. This system was originally used in early 1980s Cadillacs. Hi. Thankfull for any ideeas! Ditto , never buy a throw away vehicle again is my recommendation and my fix . After all we bailed them out of bankruptcy. Had similar problems under warranty, no telling what they rigged me up with at the dealer. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Ayush Srivastava 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. Very confusing stuff out there. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? 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? Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. I ave noticed the point about excess oil spray. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. Replacing engine due to issues caused by AFM. Here's what you need to know: 1. It replaces the AFM components with standard parts. When you don't need the full power of the engine, it provides better fuel economy." The most common issue GM vehicle owners with AFM report is increased fuel consumption. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Just shut AFM off. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? The exhaust valve remains open during the intake stroke and closes just before BDC. The problem:. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs Yes, always change all the lifters at once. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. thank You so much! Pushing forward. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. I would appreciate any feedback. If possible, will simply not using VVT provide a powerful,good running engine? This happened on a camping trip with my kids last friday night. I have successfully used a gadget that plugs into the ODBII. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. You are correct. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Thanks for your help. Another option is to plug it entirely if the AFM is already removed. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. 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? All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Did Obama make them do this? Cylinder Deactivation & Variable Engine Displacement - LiveAbout It uses a M14 x 1.5 thread plug like Dorman 65217. The oil collapses the plunger inside the lifter. What was happening to the first is slowly (or quickly in your case) happening to the others. 190k on the motor always ran AMSOIL full synth since new. This basically deactivates the cylinder deactivation system. GM switched over to the 4100 v-8 in 1982. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. . I have an 07 Yukon with 230k on the engine. Had nothing but trouble out of it. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. 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? It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. It will show up as a misfire code in a cylinders 1,4,6, or 7. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. 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. GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Any advice that you could offer would be great. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Covers me to 100K. 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 ! I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. I am considering the same. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? Does the Pressure relief vavle ever go bad?? I have a 2014 Chevy Z51 [w/dry sump oiling etc.] I have the towing package on my 13 Tahoe LTZ. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? If you ignore it and keep driving, odds are you will destroy the cam as well. No problems with any to this point. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online Just pulled it down in the garage there was no other damage , luckily. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Did not help. Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. The LZ1 was upgraded with AFM and []. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engineone is to install an AFM Disabler, and the second is to install an AFM Delete Kit. I will keep reading and take notes. There are so many moving components in an engine these days as opposed to the past. 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. chevrolet - How does cylinder deactivation work? - Motor Vehicle TheAFMsystem can be identified by its components. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Or not because it is the cast iron block and not he aluminum block? The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Then changed the oil. Cylinders two, three, and eight are all similar in cylinder deactivation. CHANGE YOUR OIL!!!!! We believe this confirmed that the AFM has never been operating in this vehicle. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. In other words, the crankshaft and bearings were not visible. So I researched and got an AFM disabler. 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. I guess I might have to call a dealership or GM to get a definite answer on this one. I own a reputable repair shop. I have a noise in the engine but it seems to go away when revved up. Its ribbed with solenoids on the underside. Seafoam with syn oil change only fixed for a week. . do you fill to capacity anyways???? 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. 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 []. 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. what deleter (if thats a real word) have you heard good things about. 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. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. One the other hand, it came without AFM, VVT, or flex fuel capability. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. It has 8,000 miles on it. 2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue 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. Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. No it runs fine on sylinder one but not on 6 or 7!!! Its Chrysler and Ford. has 92,000 miles and was just told I have cam and lifter failure. AFM - active fuel management strategy which deactivates the lifters on specific . AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. 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. Didnt change exhaust nor tune so likely no change in power/torque. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I would rather stay a V8 full time than deal with AFM issues in the future. 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. But then she passed away from cancer. Now the problems back, I have 180k miles on it now. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? whith a disabler. Constant engine and transmission problems. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. A 14 gmc 5.3 Sierra 85000 miles Just one or two. If you installed a performance cam intended for a car, it may be bleeding off some low end compression.

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