gm cylinder deactivation problems23 Apr gm cylinder deactivation problems
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? Hi Brian, Ketil, let us know what you find out. The result is improved combustion chamber pressure as the piston approaches top . 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). NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Would doing the disabler option once I get it back be the right one? https://www.cargurus.com/Cars/Discussion-t30884_ds822284. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. AFM - active fuel management strategy which deactivates the lifters on specific . please respond with your opinion. No other V-8 truck of similar weight can do that (except another GM with AFM). Drives way better for my mostly paved road driving. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. It seems this tough engine has everything incorporated into it. Theyre also notorious for bad cam tower oil leaks. 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. Will this AFM DISABLER damage anything???. This system was originally used in early 1980s Cadillacs. is it still working good since you have done that with the trans fluid? My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 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. They have plastic casing, so you can imagine what will happen with aged plastic. I couldnt agree with you less, yet I respect your opinions. That inherently less smooth operation requires additional NVH dampening. 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! I recently took a long trip and it burned 1.5 quarts of oil. I would rather stay a V8 full time than deal with AFM issues in the future. So for all of you that continue to complain about how bad these things are. Hi Mike, the metal shield you noticed is probably the windage tray. I will be installing the AFM deactivator tonight when I get hoe. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). No clue what to do. I would. Number 7 cylinder lifters stops moving when truck starts. I tried the trans fluid in the oil. But if you dont like it. Loved the looks and interior and thought a I got a great deal at $6k even. If someone didnt want to spend gas buy a Toyota. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. It only has about 9k miles on it. I have a 2012 Chevy Avalanche. 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. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Any advice that you could offer would be great. Since no air can get in or out, four cylinders provide no power. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? With the nipple, or without? The only solution is to replace the entire cylinder head. I have a 2011 GMC Sierra 1500 with the 5.3. Dont want to make a move on a new truck or jump to a 2500 yet. 2 15 with 5.3 Sierras both with 100k and 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? It essentially turns your V8 engine into a V4 which saves fuel. GM switched over to the 4100 v-8 in 1982. The wife however found this deal on an Envoy Denali . Double digit MPGs in my 98 K1500 would be a dream lmao. 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??? they are known to become plugged. Have misfire code and engine has what I would call a surge while driving. I have 217,000+ on it and it never fails meever! Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Thank you. 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 []. I plan on getting a tuner to disable the AFM. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. I did noticed the oil consumption but it was rare that I would have to add oil. This lowers the cost of building it [], [] aluminum block engine. Because I want to. I just did the delete and replaced the cam as well. Change your oil. I have a 07 Yukon with 180K and no issues what so ever. I have read synthetic isnt good for AFM lifters. 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. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. [], [] as the LS engine familys hybrid engine in trucks and SUVs. 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. Fortunately I received a reducing in house shop hourly rate. "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. 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. Some drivers want V8 power under their foot at all times. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Having a hard time finding one .. Ive only put a straight pipe exhaust, intake, and a boost controller on it. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Thanks for your help. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. Getting ready to diy for $450. Only running on drivers side cylinders. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. It was well researched and tested back in the late seventies and eighties . Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in Is the Pressure relief valve replaceable? I already ordered the parts to replace myself and remove the code. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. The 2016+ Tacomas are junk. The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. has 92,000 miles and was just told I have cam and lifter failure. 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. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . This update also saw the usage of cylinder deactivation technology or Active Fuel Management. I ran 0W-20 on more the 5000 miles between changes. . Changing the sensor didnt help. It came back on last Wednesday starting with a flash. I got the AMF disabler anyway and so far so good. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Is this an issue only with GM SUVs and trucks, or does it include cars too? Thanks. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). The oil collapses the plunger inside the lifter. GM claims fuel improvements ranging from 5%-15% depending on the engine. So I researched and got an AFM disabler. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. 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. A 14 gmc 5.3 Sierra 85000 miles Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. It has plenty of oil pressure and I put all new lifters in it. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. The engine had 200K miles. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. I call it active obama fuel management .A scam . Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. 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. Replaced all lifters. Thanks for the detailed post! [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. 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. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. I had a 2007 Yukon XL 5.3 with the AFM. 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. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Perhaps a flaw by design would be a more appropriate description . 190k on the motor always ran AMSOIL full synth since new. (Non-AFM engines have a smooth cover.). There has been a lifter noise since I bought the truck 1 year ago. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Covers me to 100K. After all we bailed them out of bankruptcy. Did not help. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Or not because it is the cast iron block and not he aluminum block? Take a look at what bmw did in its R1250 bike. He used seafoam and changed to synthetic oil. He stated if I continued to exceed 4500 RPM it would blow the lifters out. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. 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. Engines with AFM use a high-volume oil pump. 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. 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. All the time. Never did strand me on the side of the road way. 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.
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