gm cylinder deactivation problems

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. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. []. Friend will send to me from Arizona. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Not sure what else it can be. 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. Theyre also notorious for bad cam tower oil leaks. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. IMHO . It is currently at the dealer having a new long block installed under warranty. misfire or anything. [] 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. Welcome to socialism folks . When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. If you think GM pioneered cylinder deactivation, guess again , Production date on the vehicle is 04/2006 oddly enough. The engine will switch to operating on fewer cylinders when cruising at a constant speed. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. My daughters car had about 230,000 miles when she complained of the problem. 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. 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. 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. Take a look at what bmw did in its R1250 bike. Whats the next step? This is what I keep telling people. 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. Do not pay that amount. The system uses solenoids to deliver oil pressure to control. Open to suggestions about best course of action. Everything else looked good. Cylinders two, three, and eight are all similar in cylinder deactivation. Your email address will not be published. Now I get 24 to 26 with deactivation locked out and full power. Hopefully more is known by then. I have no other engine problems and Id like to fix the issue. The lifter seems to recharge whenever the truck sits for some time. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. The valve itself is part number W0133-2574213. It will show up as a misfire code in a cylinders 1,4,6, or 7. In four-cylinder mode, they act like air springs and allow for smooth operation. 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? Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Thanks for the advice Brian! How to Delete or Disable Active Fuel Management (AFM) on GM Engines Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. My fear now is not will it happen but when! Oil flows to the special lifters through theAFMtowers. Engine oil pressure is fine. Ive only put a straight pipe exhaust, intake, and a boost controller on it. The computers had not evolved enough to control the sytem. Replaced all 16 lifters due to collapsed lifter on CYl #4. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. How is that an improvement. 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 . We believe this confirmed that the AFM has never been operating in this vehicle. Some drivers want V8 power under their foot at all times. I only had 81k on the motor. 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 have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! She drove it for another 35,000 and it went out again. On one hand it has an aluminum block, which is nice. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority Another option is to plug it entirely if the AFM is already removed. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. The write up confuses me. I have a 2014 Silverado with a 5-3. [], I have a 2012 Silverado Z71 bought new. 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. (Non-AFM engines have a smooth cover.). AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. 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. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . what deleter (if thats a real word) have you heard good things about. Cylinder deactivation | GM Truck Club Forum At this state, a disabler would probably do what you need it to do. Its ribbed with solenoids on the underside. Install an AFM Delete Kit [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. The engine is running on only four cylinders. How do you know if the lifter has failed? This is in response to pretty much everyone. Any problems to watch out for?Did you replace the VLOM? Will the plug in deactivater fix the oil consumption or will it cause more consumption? I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. 5.3-liter Chevy Engine Problems: What Should You Look Out For? The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. I dont plan on installing the delete kit at this time. It is replaceable.. just remove oil pan and it will be on top at the filter. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. He stated if I continued to exceed 4500 RPM it would blow the lifters out. The wife however found this deal on an Envoy Denali . CHANGE YOUR OIL!!!!! Truck has an active P0300 code and runs very rough. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy They have plastic casing, so you can imagine what will happen with aged plastic. Im servicing a 2011 Chevrolet 5.3 with AFM. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? How to Fix GM's Cylinder Deactivation Problems Ill Never Ever buy another gm. I have an 07 Yukon with over 180K. PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 "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. I am hoping this does the trick. Thanks. 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. 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? Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Brian, I have been reading your article about the AFM. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 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. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. I would appreciate any feedback. I recently bought a low mileage 2013 Silverado and the lifters collapsed. With 40000 (Bought car 1 day before lifter died!) As you said, the ECM was never seeing the AFM so I think youre good to go. It essentially turns your V8 engine into a V4 which saves fuel. Battery was unplugged for a week.. I dont know where to being to look for the problem. AFM Sucks!!! It is being covered under warranty since I only have 72,000 miles on it. Thankfull for any ideeas! 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. Is there any reaction to the disabler when pulling a boat or trailer? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. I have an 07 Silverado 1500 ltz. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Very expensive repair too! Had similar problems under warranty, no telling what they rigged me up with at the dealer. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. I just got new warranty engine and dont want this issue again? 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. Only running on drivers side cylinders. How long did it take? He used seafoam and changed to synthetic oil. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I have no clue what to do now. 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. Yes, always change all the lifters at once. There is a chance the cam lobe was stressed and started to deteriorate. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. It works . 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. Ive been reading, with disgust and concern of the lifter/cam situation. The dealer in Rockhill, SC when asked only said they had not had a problem. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Your email address will not be published. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Why cant u just unplug the solenoid on back of engine by oil pressure sensor? All New lifters were from AC delco. When you drain the oil at three to four thousand miles its still clean. You are correct. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Covers me to 100K. bought at Brian Tooley Racing ! How did your turn out? I speak from some experience. Its not possible to install them wrong? I ave noticed the point about excess oil spray. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. With 44, its a enormous Jon to remove the oil pan. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. I am leaning heavily on installing the AFM disabler. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? 4,7 plugs foul runs rough at idle. A 14 gmc 5.3 Sierra 85000 miles Go Small? Common Problems With the Chevy Silverado 2.7L Turbo My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I have been assuming this is just a slow to pump-up lifter or lifters. 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.