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Is this an issue only with GM SUVs and trucks, or does it include cars too? Replaced all lifters. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. [], I have a 2012 Silverado Z71 bought new. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Because its not just GM that have engine problems. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Any truth to that? Their tech guys have seen it all and may have some thoughts on this as well. What type of ODBII gadget did you use? I also notice that it doesnt go into V4 when it is cold. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Its ribbed with solenoids on the underside. [], [] as the LS engine familys hybrid engine in trucks and SUVs. We need availability of a replacement engine without the AFM. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. I have a noise in the engine but it seems to go away when revved up. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Dont want to make a move on a new truck or jump to a 2500 yet. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. the extra oil isnt needed. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Friend will send to me from Arizona. Once the lifter has been damaged, the cam is probably also damaged. GM offers the following diagnostic steps in determining if this is the problem. No clue what to do. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I always have done my oil changes on time, not sure about the people who owned it before me though. I am confused about the plug in disabler. I would appreciate it if you let me know how you make out. Are there errors or something only the dealer can clear? 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. I will keep reading and take notes. Very confusing stuff out there. Excess oil will be pushed out of the pressure relief valve into the oil pan. Diablo says yes but they do not provide tunes. But then she passed away from cancer. Its Chrysler and Ford. This happened on a camping trip with my kids last friday night. If buying a tuner/chip which works best for that truck/engine? Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. 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). Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Thanks for your help. I just got new warranty engine and dont want this issue again? "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. Any problems to watch out for?Did you replace the VLOM? Truck ran fine before that. Im servicing a 2011 Chevrolet 5.3 with AFM. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. Took the heads off again. I know a few guys with Tundras. Can you tell me what needs to be done with the VVT? My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. The computers had not evolved enough to control the sytem. 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. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Im curious as to how much tran fluid you put in? Definitely dont want to do anything to fix one problem and create another. It was well researched and tested back in the late seventies and eighties . On the AFM lifters that dosnt work i have installed them With the oil hole Down! 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. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. 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? another common cause for low OP is the oil pick up tube O ring. It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". Have an intake and Borla exhaust. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Cost about $250, but it is not fool proof. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? We chickened out though and just bolted the AFM solenoid plate onto the used engine. AFMengines use special lifters for cylinders 1, 4, 6, and 7. 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. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. My Wifes 17 Buick with afm was my attempt to get back to gm. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Hopefully more is known by then. Change your oil. It essentially turns your V8 engine into a V4 which saves fuel. 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? A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. I would appreciate any feedback. It replaces the AFM components with standard parts. Your email address will not be published. [] they have a downside? 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. There are 5.3 cylinder deactivation problems that can occur. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). The biggest problem is nobody changes their oil on time. I am trying to prevent same issue. 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. Accept i only have 60K on my truck and it hasnt recovered. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . 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. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. It works . Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. At this state, a disabler would probably do what you need it to do. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. 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. Not sure which direction to go from here. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Ill Never Ever buy another gm. Will the plug in deactivater fix the oil consumption or will it cause more consumption? []. Because I want to. Would doing the disabler option once I get it back be the right one? Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. There is a chance the cam lobe was stressed and started to deteriorate. The oil collapses the plunger inside the lifter. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. Teflon coatings does not last. Replaced all 16 lifters due to collapsed lifter on CYl #4. So for all of you that continue to complain about how bad these things are. . 330-630-0240. Replacing engine due to issues caused by AFM. A 14 gmc 5.3 Sierra 85000 miles Hi Mike, the metal shield you noticed is probably the windage tray. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. I was getting ~ 30 mpg, so I love that. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I had one fail and it chattered the cam to the point that I had to Install a new cam. Hello. 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. 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. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. I read something the other day which I found to be funny. 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. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. She had driven it for a couple of months that way. I plan on getting a tuner to disable the AFM. Verified over hundreds of trips, makes no sense. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? 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. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. I have already dropped a lot of money on this truck (08 suburban). http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. The 2016+ Tacomas are junk. 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. it is the regulator guy! stalled in a certain way a warning wouldn be a bad idea. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Fouls those plugs. If you ignore it and keep driving, odds are you will destroy the cam as well. This system was originally used in early 1980s Cadillacs. Looking to tear down myself. GM uses 3 different styles all are engine specific. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. This is my second Avalanche and I never had any issues with either of them. Regards, The car runs great apart from the shuddering at those speeds. I am having that done today on my 08 Suburban and its only costing me $225. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. I have a 2013 1500 with the LC9. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? The problem:. I noticed this discussion mainly addresses Chevy Silverados and other trucks? I did noticed the oil consumption but it was rare that I would have to add oil. Does the disabler prevent the engine damage in the first place? Had nothing but trouble out of it. Cylinders two, three, and eight are all similar in cylinder deactivation. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. How do you know if the lifter has failed? Id wait until the warranty expires then disable. Brian, I have been reading your article about the AFM. In four-cylinder mode, they act like air springs and allow for smooth operation. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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? Here's what you need to know: 1. Any guidance would surely be appreciated. I already ordered the parts to replace myself and remove the code. What makes you think it was a design flaw ? changed oil , its all working now, but want to disable this sorry system. 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 []. As you said, the ECM was never seeing the AFM so I think youre good to go. TheAFMcylinders are opposite of one another in the firing order. I had a 2007 Yukon XL 5.3 with the AFM. Cant believe they havent fixed this in a decade. I hate it. Thank you for your time. I have a 12 wit 4.8 Silverado 75000 miles 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. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Required fields are marked *. I told her to never pull the gadget out. Hi Brian, Changing the sensor didnt help. Having a hard time finding one .. 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. Engines with AFM use a high-volume oil pump. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. I may just do that Vic. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Clean oil is crucial. How did your turn out? do you fill to capacity anyways???? 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. There are so many moving components in an engine these days as opposed to the past. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power.