gm cylinder deactivation problems

I own a reputable repair shop. Put everything back together proper torque, gakets, valve seals, etc. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. 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! Next day, fired it up to take the the junk yard and it ran great. 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. This is what I keep telling people. Clean oil is crucial. This allows the engine to run in V8 mode. 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 am having that done today on my 08 Suburban and its only costing me $225. So now at 168 thousand miles it still runs good but gets bad gass mileage. Yes a poor design but a flaw ? A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. 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. hi brian when you replace the lifters do you have to change the guides also? When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. 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. I havent has any lifter or cam issues. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Thats a tough call, if the warranty will cover itId let it run out. Lost number four 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. If I put my truck in manual 5, it doesnt try to go into V4 mode. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. I would. It has has 9000 miles and no lifter or other issues or codes so far. The car runs great apart from the shuddering at those speeds. My question is: do I install the electronic disabler on the new engine to avoid future issues? another common cause for low OP is the oil pick up tube O ring. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. Basically rebuilt most of the engine while in the vehicle. . NOT GOOD!! 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. Run it and let it soak overnight. lol. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. Do not pay that amount. GM claims fuel improvements ranging from 5%-15% depending on the engine. All these comments on the 5.3 are blowing my mind!!!. Unfortunately, I found out about the lifters too late. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Hi. It uses a M14 x 1.5 thread plug like Dorman 65217. Just recently, GM announced a temporary closure. thank You so much! What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). I also notice that it doesnt go into V4 when it is cold. 1. Shame this happened. I call it active obama fuel management .A scam . I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Very confusing stuff out there. It replaces the AFM components with standard parts. The oil is baked on to every component. I have a 2012 Chevy Avalanche. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. All New lifters were from AC delco. As you said, the ECM was never seeing the AFM so I think youre good to go. 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). https://www.cargurus.com/Cars/Discussion-t30884_ds822284. Oil flows to the special lifters through theAFMtowers. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] I can literally drive from Seattle to Redding CA on one tank. The lifter seems to recharge whenever the truck sits for some time. Seafoam with syn oil change only fixed for a week. How is that an improvement. 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). Have misfire code and engine has what I would call a surge while driving. Traded it with 180K miles and did not experience any problems. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. It also mentions a valve cover replacement with revised PCV valve design. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. They may be able to find some of those missing ponies. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Dont drive it if you have a dead cylinder due to afm failure. I would appreciate it if you let me know how you make out. (Non-AFM engines have a smooth cover.). I have been assuming this is just a slow to pump-up lifter or lifters. Constant engine and transmission problems. 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. it is the regulator guy! Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? I still get a P0336 code every once in a while but still good to drive around town. has 92,000 miles and was just told I have cam and lifter failure. Not sure which direction to go from here. I got the AMF disabler anyway and so far so good. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? They dont so any better than domestics on mpgs. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? I am leaning heavily on installing the AFM disabler. 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. They lasted one year with big problems. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Thanks for the detailed post! 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. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. 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. im going to plug in a dissabler when im done to keep it V8 mode all the time. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. What makes you think it was a design flaw ? Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. My 2002 I had over 298K on it with no engine related issues. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . The problem:. Chris, when you did your delete, did you also change the cam at the same time? 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 []. Call chevy.They should being paying most of that. Once I get it back, could I install the Disabler safely. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Thank you again for the response. When they are locked into position, they wont wear further and cause issues down the road. 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. Does the disabler prevent the engine damage in the first place? Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Love the truck so far. Getting ready to diy for $450. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Todays computers are faster so it does work. However, they are only functional on engines that usedAFM. TheAFMcylinders are opposite of one another in the firing order. 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. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. 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. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Once the failure has occurred, the AFM shut off methods other than that probably wont work. With 40000 Thats not all bad because it saves the cost of an AFM delete kit. 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. Because I want to. Change your oil. The system uses solenoids to deliver oil pressure to control. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. 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. 4,7 plugs foul runs rough at idle. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. Or not because it is the cast iron block and not he aluminum block? It is replaceable.. just remove oil pan and it will be on top at the filter. These trucks cost too much to have a terrible product. 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. so the trans fluid worked for you then? This system is the most effective way to disable AFM. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Learn how your comment data is processed. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Driver reported this occurred suddenly while driving down the highway. So I did the job one more time. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. GM uses 3 different styles all are engine specific. 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. How about if they just let us have a manual transmission agains for fuel mileage? Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Brian, I have been reading your article about the AFM. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. What type of ODBII gadget did you use? 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? I speak from some experience. Loved the looks and interior and thought a I got a great deal at $6k even. Engine oil pressure is fine. We believe this confirmed that the AFM has never been operating in this vehicle. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. My question on a 2007 Chevy Tahoe 5.3 AFM If you left the original cam in, the AFM cylinders will be down about 25 lbs. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. Wed recommend a call to our partners at Summit Racing. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. I plan on getting a tuner to disable the AFM. AFM Sucks!!! GM should recall every vehicle with this terrible design flaw! Whats the next step? I recently bought a 2018 Silverado 5.3L with AFM. There is a good chance that some of the drivers side lifters decided to go. Regards, I have a 2011 GMC with over 162,000 miles on it and it runs great! Toyota will be my next truck unless GM owns up and makes wright with consumers. The exhaust valve remains open during the intake stroke and closes just before BDC. Truck ran fine before that. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Once the lifter has been damaged, the cam is probably also damaged. I guess I might have to call a dealership or GM to get a definite answer on this one. They are taller and have special oil holes. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. There has been a lifter noise since I bought the truck 1 year ago. 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. 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. My daughters car had about 230,000 miles when she complained of the problem. Excess oil will be pushed out of the pressure relief valve into the oil pan. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . Ayush Srivastava It essentially turns your V8 engine into a V4 which saves fuel. bought at Brian Tooley Racing ! 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).

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