That inherently less smooth operation requires additional NVH dampening. Not sure which direction to go from here. The wife however found this deal on an Envoy Denali . I have a 2012 Chevy Avalanche. I call it active obama fuel management .A scam . The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Carbon Build-Up in the Intake Ports. Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. My daughters car had about 230,000 miles when she complained of the problem. I have 217,000+ on it and it never fails meever! All Gen IV engine blocks haveAFMtowers and oil passages cast in. I would rather stay a V8 full time than deal with AFM issues in the future. Truck has an active P0300 code and runs very rough. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. i just bought a 2018 Silverado with the 5.3 GM claims fuel improvements ranging from 5%-15% depending on the engine. Fortunately I received a reducing in house shop hourly rate. I am wondering the same thing. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. 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. Found that all passenger side cylinders are not firing. , Production date on the vehicle is 04/2006 oddly enough. 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. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Not sure what else it can be. 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. 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. Does cylinder deactivation affect engine life? - Quora You will get codes thrown if the afm is physically removed without telling the ECM you did so. (Bought car 1 day before lifter died!) Send response to tkrieg@cox.net. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have 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. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. [], [] way. It was good for about 10 miles and started with same loud knock noise. they are known to become plugged. There are no changes in the valves or the springs. After all we bailed them out of bankruptcy. They should let us the better mileage. Did not help. GM Releases Valve Lifter Service Update For V8 Engines I plan on getting a tuner to disable the AFM. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. I noticed this discussion mainly addresses Chevy Silverados and other trucks? 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Getting ready to diy for $450. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. There may be an ignition related issue on that cylinder. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. But if you dont like it. Disable Active Fuel Management - Ricks Free Auto Repair Advice Never did strand me on the side of the road way. Thats not all bad because it saves the cost of an AFM delete kit. any help? 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. I havent has any lifter or cam issues. Regards, CHANGE YOUR OIL!!!!! I would appreciate it if you let me know how you make out. 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". Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Only thing I noticed with the oil consumption issue. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. I have a 2014 Silverado with a 5-3. Is this an issue only with GM SUVs and trucks, or does it include cars too? 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! 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??? Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris. $8500.00 fix. Thanks for your help. Then again, it should have never been controlling those solenoids. If you just crack it without it starting it moves all the time . Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. it is the regulator guy! Your email address will not be published. I have a noise in the engine but it seems to go away when revved up. Yes, always change all the lifters at once. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. I know a few guys with Tundras. Fouls those plugs. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. The biggest problem is nobody changes their oil on time. Easier said than done. 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. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. Drives way better for my mostly paved road driving. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 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. Hopefully more is known by then. NOT GOOD!! AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. When you don't need the full power of the engine, it provides better fuel economy." Very expensive repair too! GM Active Fuel Management Cylinder Deactivation Technology - GM Authority Told her that it would not last and that she needed to find a different way to get around. Are you saying that I am in the clear by a year and issues fixed? GM Lifter Recall Needed, Says Class Action Lawsuit The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Why does GM's cylinder deactivation cause lifter failure? It has plenty of oil pressure and I put all new lifters in it. 2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! All eight cylinders are now powering the engine. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module?

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