gm cylinder deactivation problemsgm cylinder deactivation problems

(Bought car 1 day before lifter died!) Dont want to make a move on a new truck or jump to a 2500 yet. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? I cant really tell from driving. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Any help would be appreciated. Put everything back together proper torque, gakets, valve seals, etc. The result is improved combustion chamber pressure as the piston approaches top . More information can be found in the GM TSB bulletin number 10-06-01-008g. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. . 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? I am leaning heavily on installing the AFM disabler. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. IMHO . Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? It prevents the computer from switching over to four-cylinder mode. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Id wait until the warranty expires then disable. I call it active obama fuel management .A scam . With 40000 I recently bought a 2018 Silverado 5.3L with AFM. I would say maybe 5% of my customers keep up on their oil changes. The wife however found this deal on an Envoy Denali . https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. This really sucks. Im always sorry to hear when people run into issues like these. Get this, rebuild is only rings and maybe lifters. Hi Mike, the metal shield you noticed is probably the windage tray. Didnt change exhaust nor tune so likely no change in power/torque. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. It has has 9000 miles and no lifter or other issues or codes so far. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Easier said than done. How about if they just let us have a manual transmission agains for fuel mileage? Getting ready to diy for $450. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? Required fields are marked *. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Would never take it on a long trip. The 2nd went with a conventional valvetrain. 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. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. any help? The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Clean oil is crucial. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Corvette that does employ AFM. Engine oil pressure is fine. Everything else looked good. Not sure which direction to go from here. Your email address will not be published. Only thing I noticed with the oil consumption issue. Im curious as to how much tran fluid you put in? Pod. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Does the Pressure relief vavle ever go bad?? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Todays computers are faster so it does work. This allows the engine to run in V8 mode. Shame this happened. Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. is it still working good since you have done that with the trans fluid? I drive the same 320 mile trip every two weeks and drive the same route and full tank. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? 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. Since no air can get in or out, four cylinders provide no power. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. AFMengines use special lifters for cylinders 1, 4, 6, and 7. i just bought a 2018 Silverado with the 5.3 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. I had one fail and it chattered the cam to the point that I had to Install a new cam. I always have done my oil changes on time, not sure about the people who owned it before me though. Would you get enough power to drive at freeway speeds? 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. Should I wait until the warranty runs out, or will that be too late to stop possible damage? They lasted one year with big problems. Is this an issue only with GM SUVs and trucks, or does it include cars too? Yeh truck has 5237 miles on it They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Once the failure has occurred, the AFM shut off methods other than that probably wont work. 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. Their tech guys have seen it all and may have some thoughts on this as well. Then I guess I have to spend a bunch of money and get the delete kit. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Constant engine and transmission problems. Still have no power. Every one of these engine will have a lifter fail, this is a travesty! Basically rebuilt most of the engine while in the vehicle. The original version sprayed oil on the cylinder walls and increased oil consumption. At this state, a disabler would probably do what you need it to do. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Looking to tear down myself. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. It also has an electrical connector on the back. I have a 07 Yukon with 180K and no issues what so ever. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . 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. In other words, the crankshaft and bearings were not visible. There has been a lifter noise since I bought the truck 1 year ago. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? I have read synthetic isnt good for AFM lifters. Any problems to watch out for?Did you replace the VLOM? I want to put a AFM disabler in it what all do I need to have done. 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. Please report back if you have any issues, but I think you are in good shape. This is my project car and will be my drive (about 5000 miles a year). Ill Never Ever buy another gm. Next day, fired it up to take the the junk yard and it ran great. I quites down to nothing after running for about a minute. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. Most will want to get rid of the AFM immediately and VVT isnt for []. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? 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. 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??? The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. Theyre also notorious for bad cam tower oil leaks. I just took a long trip and it used 1.5 quarts of oil. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Told her that it would not last and that she needed to find a different way to get around. Some guys have been able to use a tool through the top with the cover off to get it to release. This system was originally used in early 1980s Cadillacs. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. You also need the disabler installed in your obd connector. They have plastic casing, so you can imagine what will happen with aged plastic. [], I have a 2012 Silverado Z71 bought new. Hi Grant is that disabler still working for you ? [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. I have already dropped a lot of money on this truck (08 suburban). It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Billy, there is some interesting trivia here on the L92. Glad I did. I have an 07 Yukon with 230k on the engine. All the time. 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. Teflon coatings does not last. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Your email address will not be published. TheAFMsystem can be identified by its components. I would just have the AFM disabled (tuned out) then. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. A 17 with 5.3. I told her to never pull the gadget out. they are known to become plugged. There is a good chance that some of the drivers side lifters decided to go. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? how many miles do you have on your engine? And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. I am confused about the plug in disabler. But if you dont like it. Brian, I have the same question as Scott. On June 4th you stated The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. I have an 07 Yukon with over 180K. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Diablo says yes but they do not provide tunes. hi brian when you replace the lifters do you have to change the guides also? [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. Most of the complaints show up in the 2009 to 2011 model years. How did your turn out? If so what would the vin code be? Have there been improvements in more recent model years employing AFM [2014 or newer]? I have the towing package on my 13 Tahoe LTZ. It could be the filter screen under the oil sending unit. Engines with AFM use a high-volume oil pump. The problem:. Is this due to the AFM being shut off? 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. 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? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Thanks for the detailed post! Truck ran fine before that. Because its not just GM that have engine problems. 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. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes what deleter (if thats a real word) have you heard good things about. I ordered a electronic disabler for it today. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I had to replace them all and the camshaft as well. I can literally drive from Seattle to Redding CA on one tank. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. Who knew? While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. They dont so any better than domestics on mpgs. That inherently less smooth operation requires additional NVH dampening. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. 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. Remembered that after I bought my Tahoe. Verified over hundreds of trips, makes no sense. I know I felt the same way. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. Install an AFM Delete Kit 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. AFM Sucks!!! Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. I havent has any lifter or cam issues. 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? GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. When you don't need the full power of the engine, it provides better fuel economy." https://www.cargurus.com/Cars/Discussion-t30884_ds822284. 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. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. 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. Now Im here tring to figure out what to do. Hi. It came back on last Wednesday starting with a flash. I may just do that Vic. 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. He unstuck it and I took it for a drive and same thing happened. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. 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. Any truth to that? After reading these forums Im a little concerned about my decision to stay with GM. 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. Thank you. Ive only put a straight pipe exhaust, intake, and a boost controller on it. They layed over night in engine oil before instalation. Or not because it is the cast iron block and not he aluminum block? I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. CHANGE YOUR OIL!!!!! I speak from some experience. The exhaust valve remains open during the intake stroke and closes just before BDC. When they are locked into position, they wont wear further and cause issues down the road. Sylinder one lost compression on my 09 5,3. Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. I have no clue what to do now. RANGE TECNOLOGY.COM. 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? They may be able to find some of those missing ponies. I ran 0W-20 no more the 5000 miles between changes. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Never did strand me on the side of the road way. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Having it fixed now, just curious Seems like a problematic design. 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. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I was getting ~ 30 mpg, so I love that. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. He used seafoam and changed to synthetic oil. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. 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. 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? . The collapsed lifters will not engage the pushrods and both valves remain closed.

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