Given that, would you recommend buying one of the OBD-II devices to disable AFM? One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. hi brian when you replace the lifters do you have to change the guides also? This basically deactivates the cylinder deactivation system. On one hand it has an aluminum block, which is nice. 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. bought at Brian Tooley Racing ! , Production date on the vehicle is 04/2006 oddly enough. On the AFM lifters that dosnt work i have installed them With the oil hole Down! My 2002 I had over 298K on it with no engine related issues. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Do you think I can still disable AFM? Engine oil pressure is fine. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] The motor I pulled was a 2007 LY5 with about 77k on it. 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 don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. My question on a 2007 Chevy Tahoe 5.3 AFM The older truck gets 19 mpg the newer truck with fuel management gets 14. Oil flows to the special lifters through theAFMtowers. Any help would be appreciated. Chris, when you did your delete, did you also change the cam at the same time? One the other hand, it came without AFM, VVT, or flex fuel capability. 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 12 with 4.8 Silverado 75000 miles Cylinder Deactivation to the Rescue. I call it active obama fuel management .A scam . Mine did at the exact same time. 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. Shame this happened. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Can I (should I) also change to a standard volume oil pump? Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Have an intake and Borla exhaust. Constant engine and transmission problems. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Perhaps a flaw by design would be a more appropriate description . Dont want to make a move on a new truck or jump to a 2500 yet. Hi Brian, 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 have successfully used a gadget that plugs into the ODBII. I cant really tell from driving. 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 only solution is to replace the entire cylinder head. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. I will keep reading and take notes. Engine starts but is throwing a misfire on cyls 4,7. 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. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Did Obama make them do this? changed oil , its all working now, but want to disable this sorry system. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Thanks. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Traded it with 180K miles and did not experience any problems. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. If you are using VVT, you could use the NAL-12612273 (L92) cam. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. But not sure very annoying. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. 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. Thankfull for any ideeas! My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. 50,000 miles. The dealer in Rockhill, SC when asked only said they had not had a problem. Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? 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? When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Why this happens is a more . Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. My daughters car had about 230,000 miles when she complained of the problem. I quites down to nothing after running for about a minute. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. The oil collapses the plunger inside the lifter. We need availability of a replacement engine without the AFM. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. Loved the looks and interior and thought a I got a great deal at $6k even. Would installing the Disabler solve this? The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? It was good for about 10 miles and started with same loud knock noise. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Some drivers want V8 power under their foot at all times. Pulled right valve cover an rockers on syl 6 dont move. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. AFM - active fuel management strategy which deactivates the lifters on specific . I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. They are taller and have special oil holes. Put everything back together proper torque, gakets, valve seals, etc. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. Ketil, let us know what you find out. I love the car so far. Hi Mike, the metal shield you noticed is probably the windage tray. 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. It is being covered under warranty since I only have 72,000 miles on it. I noticed this discussion mainly addresses Chevy Silverados and other trucks? The system uses solenoids to deliver oil pressure to control. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. With 40000 Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. Have a lifter problem on my 2010 5.3 Silverado. When you eliminate the AFM system, the extra oil is no longer needed. Looking to tear down myself. another common cause for low OP is the oil pick up tube O ring. Install the disabler when you get your Yukon back and it will remain in good working order. Cant believe they havent fixed this in a decade. Have misfire code and engine has what I would call a surge while driving. [] 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 ran 0W-20 no more the 5000 miles between changes. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. No it runs fine on sylinder one but not on 6 or 7!!! This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Get this, rebuild is only rings and maybe lifters. Keith, were happy to help. After reading these forums Im a little concerned about my decision to stay with GM. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). I ave noticed the point about excess oil spray. 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. 190k on the motor always ran AMSOIL full synth since new. Ill Never Ever buy another gm. They have plastic casing, so you can imagine what will happen with aged plastic. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. []. Hi. It also mentions a valve cover replacement with revised PCV valve design. There are no changes in the valves or the springs. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? The trucks are only supposed to use two four. . I am leaning heavily on installing the AFM disabler. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Oil 0w or 5w -20 Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engineone is to install an AFM Disabler, and the second is to install an AFM Delete Kit. NOT GOOD!! Thanks. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. I already ordered the parts to replace myself and remove the code. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. This is my second Avalanche and I never had any issues with either of them. GM offers the following diagnostic steps in determining if this is the problem. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. How about if they just let us have a manual transmission agains for fuel mileage? The detergent. Is there any reaction to the disabler when pulling a boat or trailer? It is usually first noticed during highway driving. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Excess oil will be pushed out of the pressure relief valve into the oil pan. TheAFMcylinders are opposite of one another in the firing order. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. I recently bought a 2018 Silverado 5.3L with AFM. Dod is the biggest failure sence the 8-6-4 caddie in 1981. 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. [], I have a 2012 Silverado Z71 bought new. I am confused about the plug in disabler. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. 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. 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. At this state, a disabler would probably do what you need it to do. Where can I buy a bolt to replace this relief valve ?? As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines.

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