The oil is baked on to every component. 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 []. When you eliminate the AFM system, the extra oil is no longer needed. Since the tranny oil worked, you should now change the oil, right? What would you do if you were in my situation? I quites down to nothing after running for about a minute. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. This is my project car and will be my drive (about 5000 miles a year). 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. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. I have an 07 Yukon with 230k on the engine. Most of the complaints show up in the 2009 to 2011 model years. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? If under the truck while parked and it is doing it it sounds like it is towards the back of motor. 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. 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. Put everything back together proper torque, gakets, valve seals, etc. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. 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. Fortunately I received a reducing in house shop hourly rate. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Hi Brian, This really sucks. 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. Here's what you need to know: 1. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. The valve itself is part number W0133-2574213. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. The Jury is still out on the Gen. 5s but the warranty could be an issue. I loved this rtuck until this happened!! Run it and let it soak overnight. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. Its Chrysler and Ford. AFMlifters have a history of failing and oil consumption can be a problem. It was well researched and tested back in the late seventies and eighties . It is being covered under warranty since I only have 72,000 miles on it. I have a 12 with 4.8 Silverado 75000 miles 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. TheAFMsystem can be identified by its components. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. 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. We need availability of a replacement engine without the AFM. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Constant engine and transmission problems. We were getting a code that the cam position sensor was not functioning properly. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Can I (should I) also change to a standard volume oil pump? These trucks cost too much to have a terrible product. I am wondering the same thing. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. 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. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. Replaced all 16 lifters due to collapsed lifter on CYl #4. Battery was unplugged for a week.. Unfortunately, I found out about the lifters too late. Easier said than done. New plugs and wires. Its got a hundred forty-five thousand miles on it. Hopefully he can free up the stuck/collapsed lifter. $8500.00 fix. No clue what to do. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? There is a good chance that some of the drivers side lifters decided to go. TheAFMcylinders are opposite of one another in the firing order. Last GM Ill ever buy unless its got a diesel. Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. Welcome to socialism folks . They layed over night in engine oil before instalation. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM After all we bailed them out of bankruptcy. 2 15 with 5.3 Sierras both with 100k and The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Now I get 24 to 26 with deactivation locked out and full power. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. 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??? You may want to update your post. 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. I sold them when they were new. Just one. 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! If the lifter actually fails so that the mechanism wont release, it wont work. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Install the disabler when you get your Yukon back and it will remain in good working order. They are taller and have special oil holes. so the trans fluid worked for you then? Replaced all lifters. Any guidance would surely be appreciated. The motor I pulled was a 2007 LY5 with about 77k on it. If you ignore it and keep driving, odds are you will destroy the cam as well. I have a 2014 Silverado with a 5-3. Learn how your comment data is processed. More information can be found in the GM TSB bulletin number 10-06-01-008g. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. With 40000 On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . 4,7 plugs foul runs rough at idle. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Is this an issue only with GM SUVs and trucks, or does it include cars too? Should I wait until the warranty runs out, or will that be too late to stop possible damage? has 92,000 miles and was just told I have cam and lifter failure. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. My question on a 2007 Chevy Tahoe 5.3 AFM The detergent. They lasted one year with big problems. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. This lowers the cost of building it [], [] aluminum block engine. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. I dont know where to being to look for the problem. im going to plug in a dissabler when im done to keep it V8 mode all the time. 1. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. AFM Sucks!!! of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. You cannot compare them to old 350s. 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. Most will want to get rid of the AFM immediately. Its not possible to install them wrong? Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. Oil flows to the special lifters through theAFMtowers. Engine oil pressure is fine. Our 2013 yukon with 47k miles just failed. All Gen IV engine blocks haveAFMtowers and oil passages cast in. They may be able to find some of those missing ponies. If you just crack it without it starting it moves all the time . Disable the afm. I wont bother with blocking the relief valve. If buying a tuner/chip which works best for that truck/engine? If someone didnt want to spend gas buy a Toyota. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. [], I have a 2012 Silverado Z71 bought new. As you said, the ECM was never seeing the AFM so I think youre good to go. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? 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). So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. With 40000 You could also have tried that if the trans oil didnt work. Would doing the disabler option once I get it back be the right one? I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. 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? The write up confuses me. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. I recently took a long trip and it burned 1.5 quarts of oil. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. NOT GOOD!! Is there any potential down-side to doing this in other words, might this do more harm than good? Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? The most common issue GM vehicle owners with AFM report is increased fuel consumption. Mine did at the exact same time. CHANGE YOUR OIL!!!!! I had a 2007 Yukon XL 5.3 with the AFM. 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??? So I did the job one more time. A 14 gmc 5.3 Sierra 85000 miles With the nipple, or without? In other words, the crankshaft and bearings were not visible. I ran 0W-20 on more the 5000 miles between changes. [], [] LS Tech: How to Delete VVT or DisableAFM []. I would rather stay a V8 full time than deal with AFM issues in the future. It actavated the lifter? The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Having a hard time finding one .. I have had some say that it is the valves and others say that it is the cats plugged. My fear now is not will it happen but when! is it still working good since you have done that with the trans fluid? I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. But not sure very annoying. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Corvette that does employ AFM. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. I call it active obama fuel management .A scam . Chris, when you did your delete, did you also change the cam at the same time? NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Now the problems back, I have 180k miles on it now. Is this the shield you referred to in a past post? 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 []. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. If you left the original cam in, the AFM cylinders will be down about 25 lbs. 1. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. If I had wanted a 4 banger I would have bought one. Thank you. 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? There are so many moving components in an engine these days as opposed to the past. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Nine plaintiffs filed the General . He used seafoam and changed to synthetic oil. i just bought a 2018 Silverado with the 5.3 The engine is running on only four cylinders. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Drives way better for my mostly paved road driving. Keith, were happy to help. Very expensive repair too! It could be the filter screen under the oil sending unit. Just one or two. How about if they just let us have a manual transmission agains for fuel mileage? Thanks. Most of all, my concern is reliability. If the 4th cylinder lifter has failed, would driving it damage the engine? I have read synthetic isnt good for AFM lifters. Any thoughts or suggestions would be appreciated. do you fill to capacity anyways???? Now you tell me AFM works and I will tell you; that you are full of shit! 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). 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Regardless of the AFM solenoid being commanded on or off. I am leaning heavily on installing the AFM disabler. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Had nothing but trouble out of it. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? A lot of drivers reported losing 2-4 quarts of oil in between oil changes. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT.