While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. It was well researched and tested back in the late seventies and eighties . Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. The 2016+ Tacomas are junk. Brian, I have the same question as Scott. Thank you again for the response. I speak from some experience. Just shut AFM off. TheAFMcylinders are opposite of one another in the firing order. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Took it to the dealer and was told I had a collapsed lifter. I had purchased an extended warranty when I bought the truck new. I have an 07 Silverado 1500 ltz. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. If you are using VVT, you could use the NAL-12612273 (L92) cam. The exhaust valve remains open during the intake stroke and closes just before BDC. 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??? I am hoping this does the trick. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Does the Pressure relief vavle ever go bad?? I dont plan on installing the delete kit at this time. . Love the truck. Perhaps a flaw by design would be a more appropriate description . Because I want to. Thanks. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. Cost about $250, but it is not fool proof. Should I buy one to disable the V4 mode? Your email address will not be published. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . This is in response to pretty much everyone. There are 5.3 cylinder deactivation problems that can occur. HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. No problems with any to this point. Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. We believe this confirmed that the AFM has never been operating in this vehicle. On the AFM lifters that dosnt work i have installed them With the oil hole Down! [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. Diablo says yes but they do not provide tunes. So I did the job one more time. We chickened out though and just bolted the AFM solenoid plate onto the used engine. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Would never take it on a long trip. please respond with your opinion. [], [] way. 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? You could also have tried that if the trans oil didnt work. Now I get 24 to 26 with deactivation locked out and full power. Problems After AFM Delete And How to Solve Them? - Tools Bible Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. There is a good chance that some of the drivers side lifters decided to go. I have the towing package on my 13 Tahoe LTZ. I had privilege to work on some of that garbage they never did work . I ordered a electronic disabler for it today. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. How to Delete or Disable Active Fuel Management (AFM) Excess oil will be pushed out of the pressure relief valve into the oil pan. Better airflow reduces drag on the pistons and the associated pumping losses. . Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? It seems this tough engine has everything incorporated into it. Your email address will not be published. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. GM Releases Valve Lifter Service Update For V8 Engines After reading these forums Im a little concerned about my decision to stay with GM. 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. Are you saying that I am in the clear by a year and issues fixed? Sylinder one lost compression on my 09 5,3. Thank you for your time. The problem:. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. . Junk . The valve itself is part number W0133-2574213. Only running on drivers side cylinders. Yes, always change all the lifters at once. The dealer in Rockhill, SC when asked only said they had not had a problem. If I had wanted a 4 banger I would have bought one. I have a shop 39 yrs . thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. At this state, a disabler would probably do what you need it to do. Remembered that after I bought my Tahoe. With 44, its a enormous Jon to remove the oil pan. I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Disable Active Fuel Management - Ricks Free Auto Repair Advice Didnt change exhaust nor tune so likely no change in power/torque. The 5 Most Common Chevy EcoTec3 5.3L Engine Problems 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. All eight cylinders are now powering the engine. lol. Thanks. I havent has any lifter or cam issues. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. If possible, will simply not using VVT provide a powerful,good running engine? [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Regards, It was in the late 70s or early 80s and it was a POS, Your memory serves you pretty well I too have the same nightmares lol. 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. Are there errors or something only the dealer can clear? Cant believe they havent fixed this in a decade. Its ribbed with solenoids on the underside. Regardless of the AFM solenoid being commanded on or off. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. I dont know where to being to look for the problem. Brian, All the time. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. How to Fix GM's Cylinder Deactivation Problems . This is my project car and will be my drive (about 5000 miles a year). Regarding the cylinder deactivation impact on fuel consumption . I have a 2014 Silverado with a 5-3. Solenoids, new lifters also test voltage to solenoid pack all good their, 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. No problems with any to this point. Only thing I noticed with the oil consumption issue. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. any help? Dont want to make a move on a new truck or jump to a 2500 yet. Double digit MPGs in my 98 K1500 would be a dream lmao. Getting ready to diy for $450. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. All these comments on the 5.3 are blowing my mind!!!. Everything else looked good. Learn how your comment data is processed. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. What would you do if you were in my situation? One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Last GM Ill ever buy unless its got a diesel. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. stalled in a certain way a warning wouldn be a bad idea. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I plan on getting a tuner to disable the AFM. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. 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. What was happening to the first is slowly (or quickly in your case) happening to the others. If you just crack it without it starting it moves all the time . AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Do not pay that amount. You may want to update your post. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 1. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. Carbon Build-Up in the Intake Ports. GM should recall every vehicle with this terrible design flaw! It is usually first noticed during highway driving. it is the regulator guy! I read something the other day which I found to be funny. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Thats not all bad because it saves the cost of an AFM delete kit. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. I couldnt agree with you less, yet I respect your opinions. I am confused about the plug in disabler. But not sure very annoying. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. 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? Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in All ready done valve job . My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. You cannot compare them to old 350s. Then changed the oil.