I am leaning heavily on installing the AFM disabler. Most of the complaints show up in the 2009 to 2011 model years. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. (Non-AFM engines have a smooth cover.). I read something the other day which I found to be funny. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. 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. Todays computers are faster so it does work. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. 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. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. Welcome to socialism folks . Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? The detergent. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Engines with AFM use a high-volume oil pump. There are 5.3 cylinder deactivation problems that can occur. Accept i only have 60K on my truck and it hasnt recovered. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. So I did the job one more time. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. Have a lifter problem on my 2010 5.3 Silverado. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. I call it active obama fuel management .A scam . [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. I hate it. This is what I keep telling people. It replaces the AFM components with standard parts. They dont so any better than domestics on mpgs. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. 2 15 with 5.3 Sierras both with 100k and [], [] LS Tech: How to Delete VVT or DisableAFM []. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. GM should recall every vehicle with this terrible design flaw! Just shut AFM off. I have an 07 Silverado 1500 ltz. Thanks. Yes thats true. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. Pod. The older truck gets 19 mpg the newer truck with fuel management gets 14. Im confused from the write up about the plug in. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. Get this, rebuild is only rings and maybe lifters. Where can I buy a bolt to replace this relief valve ?? My 5.3 is. 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. Also putting in a new transmission vs. rebuilding. I will keep reading and take notes. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Thanks. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! Seafoam with syn oil change only fixed for a week. Is there any reaction to the disabler when pulling a boat or trailer? It was well researched and tested back in the late seventies and eighties . Send response to tkrieg@cox.net. What makes you think it was a design flaw ? Love the truck. Not sure what else it can be. 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. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. I just did the delete and replaced the cam as well. He unstuck it and I took it for a drive and same thing happened. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). I havent has any lifter or cam issues. No movement on the rocker arms. 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. Install ls3 valley cover. The computers had not evolved enough to control the sytem. 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! Diablo says yes but they do not provide tunes. I have 217,000+ on it and it never fails meever! When you drain the oil at three to four thousand miles its still clean. Run it and let it soak overnight. Brian, I have been reading your article about the AFM. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. They may be able to find some of those missing ponies. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Oil flows to the special lifters through theAFMtowers. I am having that done today on my 08 Suburban and its only costing me $225. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. what deleter (if thats a real word) have you heard good things about. More information can be found in the GM TSB bulletin number 10-06-01-008g. These trucks cost too much to have a terrible product. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Now Im here tring to figure out what to do. 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. Driver reported this occurred suddenly while driving down the highway. But not sure very annoying. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I have a noise in the engine but it seems to go away when revved up. Now I get 24 to 26 with deactivation locked out and full power. With the nipple, or without? 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. I have read synthetic isnt good for AFM lifters. Im curious as to how much tran fluid you put in? Remembered that after I bought my Tahoe. How did your turn out? It seems this tough engine has everything incorporated into it. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Regardless of the AFM solenoid being commanded on or off. She had driven it for a couple of months that way. Only running on drivers side cylinders. Very expensive repair too! My 2002 I had over 298K on it with no engine related issues. Friend will send to me from Arizona. My daughters car had about 230,000 miles when she complained of the problem. This system was originally used in early 1980s Cadillacs. So now at 168 thousand miles it still runs good but gets bad gass mileage. 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. In other words, the crankshaft and bearings were not visible. It came back on last Wednesday starting with a flash. Took the heads off again. Mine did at the exact same time. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5). There is a good chance that some of the drivers side lifters decided to go. It depends on the failure mode of the lifter however, certainly worth a try. One must anticipate this. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . [] 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. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Drives way better for my mostly paved road driving. I am wondering the same thing. Pulled the inntake and replaced valleypan With all the solenoids. Most will want to get rid of the AFM immediately. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. We believe this confirmed that the AFM has never been operating in this vehicle. It will show up as a misfire code in a cylinders 1,4,6, or 7. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? 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. Yes, always change all the lifters at once. All New lifters were from AC delco. What the biggest reported problem with Chevy Silverados? Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. Its a CA EMMISIONS TRUCK. Having a hard time finding one .. This is my second Avalanche and I never had any issues with either of them. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. After reading these forums Im a little concerned about my decision to stay with GM. On one hand it has an aluminum block, which is nice. Another option is to plug it entirely if the AFM is already removed. Since the tranny oil worked, you should now change the oil, right? stalled in a certain way a warning wouldn be a bad idea. This system is the most effective way to disable AFM. []. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. AFMengines use special lifters for cylinders 1, 4, 6, and 7. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. No other V-8 truck of similar weight can do that (except another GM with AFM). Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. The motor I pulled was a 2007 LY5 with about 77k on it. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual.
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