gm cylinder deactivation problems

When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. Their tech guys have seen it all and may have some thoughts on this as well. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. I have no other engine problems and Id like to fix the issue. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. I couldnt agree with you less, yet I respect your opinions. 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. Are you saying that I am in the clear by a year and issues fixed? 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. I am trying to prevent same issue. $8500.00 fix. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. Never did strand me on the side of the road way. The Jury is still out on the Gen. 5s but the warranty could be an issue. But the problem at that time was the computer technology. In four-cylinder mode, they act like air springs and allow for smooth operation. I was getting ~ 30 mpg, so I love that. Would never take it on a long trip. I hate it. So I did the job one more time. What would you do if you were in my situation? They lasted one year with big problems. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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 been assuming this is just a slow to pump-up lifter or lifters. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. I told her to never pull the gadget out. I speak from some experience. Getting ready to diy for $450. 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. Brian, Thank you again for the response. This system was originally used in early 1980s Cadillacs. . The engine will switch to operating on fewer cylinders when cruising at a constant speed. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. It is being covered under warranty since I only have 72,000 miles on it. Then again, it should have never been controlling those solenoids. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 1. How is that an improvement. they are known to become plugged. The problem:. 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. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. 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? Help appreciated. What was happening to the first is slowly (or quickly in your case) happening to the others. Install an AFM Delete Kit The biggest problem is nobody changes their oil on time. 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? Hopefully more is known by then. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? 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. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. [], [] way. The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. If buying a tuner/chip which works best for that truck/engine? This system is the most effective way to disable AFM. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Loved the looks and interior and thought a I got a great deal at $6k even. So I researched and got an AFM disabler. 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. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. whith a disabler. Pushing forward. what deleter (if thats a real word) have you heard good things about. It prevents the computer from switching over to four-cylinder mode. Pod. []. Not sure which direction to go from here. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Ketil, let us know what you find out. How about if they just let us have a manual transmission agains for fuel mileage? In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. 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. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. 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. Love the truck so far. There is a good chance that some of the drivers side lifters decided to go. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I have a 07 Yukon with 180K and no issues what so ever. Took the heads off again. Chevrolet 5.3 Engine Issues and Recommendations An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. I am trying to find out of this is true. But after reading this thread, Im a little concerned about the long-term reliability. I own a reputable repair shop. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. My question on a 2007 Chevy Tahoe 5.3 AFM Replace the cam or do the delete kit? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. The collapsed lifters will not engage the pushrods and both valves remain closed. 1. I am considering the same. I had privilege to work on some of that garbage they never did work . [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Since the tranny oil worked, you should now change the oil, right? 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. Im confused from the write up about the plug in. Any guidance would surely be appreciated. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. []. Hello! 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. However, they are only functional on engines that usedAFM. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. 190k on the motor always ran AMSOIL full synth since new. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. 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. They dont so any better than domestics on mpgs. TheAFMsystem can be identified by its components. All the time. Runs better than new now and no more oil consumpsion!! AFM - active fuel management strategy which deactivates the lifters on specific . Welcome to socialism folks . [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. misfire or anything. hi brian when you replace the lifters do you have to change the guides also? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. Also putting in a new transmission vs. rebuilding. Driver reported this occurred suddenly while driving down the highway. Its got a hundred forty-five thousand miles on it. I got the AMF disabler anyway and so far so good. GM uses 3 different styles all are engine specific. Looking forward to input from the forum, Thank you. We believe this confirmed that the AFM has never been operating in this vehicle. Some guys have been able to use a tool through the top with the cover off to get it to release. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. The engine had 200K miles. 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? Dont drive it if you have a dead cylinder due to afm failure. Take a look at what bmw did in its R1250 bike. Very confusing stuff out there. Most of all, my concern is reliability. Thanks for the advice Brian! We did take it apart to check for metal possibly being trapped inside, it looked like brand new. bought at Brian Tooley Racing ! Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! My 5.3 has a vin code of O. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Brian, I have been reading your article about the AFM. . All ready done valve job . But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. 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? Ditto , never buy a throw away vehicle again is my recommendation and my fix . Have misfire code and engine has what I would call a surge while driving. Engine oil pressure is fine. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . GM should recall every vehicle with this terrible design flaw! Told her that it would not last and that she needed to find a different way to get around. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Im crossing my fingers it does the trick! What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Replacing engine due to issues caused by AFM. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Thanks. Thats not all bad because it saves the cost of an AFM delete kit. 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. .IMHO . The only solution is to replace the entire cylinder head. Chris, when you did your delete, did you also change the cam at the same time? Yes, always change all the lifters at once. Your email address will not be published. TheAFMcylinders are opposite of one another in the firing order. Brian, I have the same question as Scott. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Keith, were happy to help. Billy, there is some interesting trivia here on the L92. We need availability of a replacement engine without the AFM. Having it fixed now, just curious Seems like a problematic design. I have already dropped a lot of money on this truck (08 suburban). I sold them when they were new. A tuner can often fix that as well by giving it some more ignition advance in these regions. Since no air can get in or out, four cylinders provide no power. 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. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. 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??? Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? With the nipple, or without? The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. 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. No it runs fine on sylinder one but not on 6 or 7!!! It was well researched and tested back in the late seventies and eighties . 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? The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak .

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