After reading these forums Im a little concerned about my decision to stay with GM. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. Or not because it is the cast iron block and not he aluminum block? Ive been reading, with disgust and concern of the lifter/cam situation. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. I call it active obama fuel management .A scam . I have an 07 Yukon with 230k on the engine. I recently bought a 2018 Silverado 5.3L with AFM. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. I know I felt the same way. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. No problems with any to this point. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. I will be installing the AFM deactivator tonight when I get hoe. I quites down to nothing after running for about a minute. 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. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Diablo says yes but they do not provide tunes. Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. With 44, its a enormous Jon to remove the oil pan. any help? [], [] as the LS engine familys hybrid engine in trucks and SUVs. Not sure what else it can be. 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. []. My 2002 I had over 298K on it with no engine related issues. The LZ1 was upgraded with AFM and []. According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. 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. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. I have a noise in the engine but it seems to go away when revved up. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Have a lifter problem on my 2010 5.3 Silverado. Thanks. I would just have the AFM disabled (tuned out) then. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. Because I want to. 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. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Unfortunately, I found out about the lifters too late. Seafoam with syn oil change only fixed for a week. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. I have already dropped a lot of money on this truck (08 suburban). I have an 07 Yukon with over 180K. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. It has the orings in place, that seals the towers. Then changed the oil. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? How is that an improvement. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). However, they are only functional on engines that usedAFM. The oil collapses the plunger inside the lifter. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! GM get a clue! $8500.00 fix. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). You could also have tried that if the trans oil didnt work. I love the car so far. If I had wanted a 4 banger I would have bought one. All eight cylinders are now powering the engine. If you are using VVT, you could use the NAL-12612273 (L92) cam. 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! NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. You are correct. It is being covered under warranty since I only have 72,000 miles on it. If I put my truck in manual 5, it doesnt try to go into V4 mode. 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. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. Pushing forward. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. My question on a 2007 Chevy Tahoe 5.3 AFM 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? The trucks are only supposed to use two four. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . It essentially turns your V8 engine into a V4 which saves fuel. 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. they are known to become plugged. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. The 2nd went with a conventional valvetrain. This is my second Avalanche and I never had any issues with either of them. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. has 92,000 miles and was just told I have cam and lifter failure. Get this, rebuild is only rings and maybe lifters. Id wait until the warranty expires then disable. The engine had 200K miles. Fortunately, the old engine hadnt been shipped back to the remanufacturer. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. 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 ! A lot of drivers reported losing 2-4 quarts of oil in between oil changes. I ran 0W-20 no more the 5000 miles between changes. I wont bother with blocking the relief valve. Really could use some pointers. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Brian, thank you for the quick response. This system was originally used in early 1980s Cadillacs. At this state, a disabler would probably do what you need it to do. I have been assuming this is just a slow to pump-up lifter or lifters. Did not help. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. The Jury is still out on the Gen. 5s but the warranty could be an issue. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. 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. 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. All Cylinders. Verified over hundreds of trips, makes no sense. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Todays computers are faster so it does work. Some drivers want V8 power under their foot at all times. I just bought a 2018 Silverado. i just bought a 2018 Silverado with the 5.3 Only running on drivers side cylinders. 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. Now Im here tring to figure out what to do. They took the engine down today found so much damage inside they ordered a new engine from Detroit. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. I ave noticed the point about excess oil spray. do you fill to capacity anyways???? I sold them when they were new.
