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After reading these forums Im a little concerned about my decision to stay with GM. Then I guess I have to spend a bunch of money and get the delete kit. Then again, it should have never been controlling those solenoids. At this state, a disabler would probably do what you need it to do. [], [] way. Replaced all 16 lifters due to collapsed lifter on CYl #4. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Im confused from the write up about the plug in. []. Regards, I call it active obama fuel management .A scam . I quites down to nothing after running for about a minute. 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. Corvette that does employ AFM. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. But the problem at that time was the computer technology. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. GM offers the following diagnostic steps in determining if this is the problem. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Replacing engine due to issues caused by AFM. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. It was good for about 10 miles and started with same loud knock noise. Love the truck. We believe this confirmed that the AFM has never been operating in this vehicle. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. 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. 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. 2011 Chevy Avalanche LTZ. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Then changed the oil. I can literally drive from Seattle to Redding CA on one tank. I am wondering the same thing. I guess I might have to call a dealership or GM to get a definite answer on this one. 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. This basically deactivates the cylinder deactivation system. All eight cylinders are now powering the engine. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. If you just crack it without it starting it moves all the time . Will the plug in deactivater fix the oil consumption or will it cause more consumption? Thank you. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. I am hoping this does the trick. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . New plugs and wires. They have plastic casing, so you can imagine what will happen with aged plastic. 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). An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. A tuner can often fix that as well by giving it some more ignition advance in these regions. I had privilege to work on some of that garbage they never did work . Carbon Build-Up in the Intake Ports. Ill Never Ever buy another gm. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Im curious as to how much tran fluid you put in? What type of disabler did you go with? Replaced all lifters on passenger side as well as pushrods for even wear. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Constant engine and transmission problems. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. I already ordered the parts to replace myself and remove the code. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. 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. A 14 gmc 5.3 Sierra 85000 miles The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. He unstuck it and I took it for a drive and same thing happened. We chickened out though and just bolted the AFM solenoid plate onto the used engine. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. 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. On the AFM lifters that dosnt work i have installed them With the oil hole Down! CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. 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. How did your turn out? Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Just one. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. 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! Hi Brian, But it also restricts passages that the oil runs through. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. How do you know if the lifter has failed? 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 []. Ketil, let us know what you find out. If I had wanted a 4 banger I would have bought one. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. As you said, the ECM was never seeing the AFM so I think youre good to go. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Thanks for the advice Brian! Is this due to the AFM being shut off? Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. misfire or anything. I am considering the same. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. thank You so much! [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. 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. She started to have the lifter problem again after 60,000 miles more. Yes a poor design but a flaw ? I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. If possible, will simply not using VVT provide a powerful,good running engine? Install an AFM Delete Kit When you don't need the full power of the engine, it provides better fuel economy." Why would GM ever produce such problems with such little to gain. It could be the filter screen under the oil sending unit. I know a few guys with Tundras. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Every one of these engine will have a lifter fail, this is a travesty! Whats the next step? Easier said than done. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. Still have no power. I have read synthetic isnt good for AFM lifters. 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. So I did the job one more time. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. It has the orings in place, that seals the towers. 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). 1. Will this AFM DISABLER damage anything???. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Id wait until the warranty expires then disable. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. I recently took a long trip and it burned 1.5 quarts of oil. Now I get 24 to 26 with deactivation locked out and full power. It works . More information can be found in the GM TSB bulletin number 10-06-01-008g. the body is in great shape. The motor I pulled was a 2007 LY5 with about 77k on it. Very confusing stuff out there. 1. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. Learn how your comment data is processed. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Not sure what else it can be. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Did not help. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. 330-630-0240. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Perhaps a flaw by design would be a more appropriate description . This new lawsuit is essentially identical to the previous. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . 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. Its got a hundred forty-five thousand miles on it. I would rather stay a V8 full time than deal with AFM issues in the future. My fear now is not will it happen but when! I just took a long trip and it used 1.5 quarts of oil. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . Pod. Friend will send to me from Arizona. 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 would say maybe 5% of my customers keep up on their oil changes. But if you dont like it. [], [] LS Tech: How to Delete VVT or DisableAFM []. It only has about 9k miles on it. 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? I have successfully used a gadget that plugs into the ODBII. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. I noticed this discussion mainly addresses Chevy Silverados and other trucks? The only solution is to replace the entire cylinder head. any help? I dont know where to being to look for the problem. bought at Brian Tooley Racing ! The system uses solenoids to deliver oil pressure to control. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. What was happening to the first is slowly (or quickly in your case) happening to the others. 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. What makes you think it was a design flaw ? Cant believe they havent fixed this in a decade. 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 have an 07 Yukon with 230k on the engine. The car runs great apart from the shuddering at those speeds. Cylinders two, three, and eight are all similar in cylinder deactivation. Have not had a problem yet. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I have a shop 39 yrs . Lost number four The biggest problem is nobody changes their oil on time. My Wifes 17 Buick with afm was my attempt to get back to gm. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. I just bought a 2018 Silverado. . Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. That inherently less smooth operation requires additional NVH dampening. It is usually first noticed during highway driving. She drove it for another 35,000 and it went out again. 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? Should I wait until the warranty runs out, or will that be too late to stop possible damage? However, they are only functional on engines that usedAFM. Most will want to get rid of the AFM immediately and VVT isnt for []. It uses a M14 x 1.5 thread plug like Dorman 65217. You are correct. When you drain the oil at three to four thousand miles its still clean. Did Obama make them do this? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. However, the fuel savings are not always as much as expected. 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. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. All these comments on the 5.3 are blowing my mind!!!. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Its not GMs choice to use AFM. When you eliminate the AFM system, the extra oil is no longer needed. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. My 5.3 has a vin code of O. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. I only had 81k on the motor. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). 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. Clean oil is crucial. It came back on last Wednesday starting with a flash. It was well researched and tested back in the late seventies and eighties . , Production date on the vehicle is 04/2006 oddly enough. A 17 with 5.3. Drives way better for my mostly paved road driving. 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 []. Because its not just GM that have engine problems. It does seem that when they start goingthey go quickly. Since the tranny oil worked, you should now change the oil, right? The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Dod is the biggest failure sence the 8-6-4 caddie in 1981. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. Dont drive it if you have a dead cylinder due to afm failure. Disable the afm. Hopefully more is known by then. 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. Any help would be appreciated. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? If someone didnt want to spend gas buy a Toyota. All Cylinders. Are you saying that I am in the clear by a year and issues fixed? Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. AFMlifters have a history of failing and oil consumption can be a problem. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. changed oil , its all working now, but want to disable this sorry system. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Thanks. Just shut AFM off. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. so the trans fluid worked for you then? If I put the Range module on, is that all I need to do, both now and long term? 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. I have a 07 Yukon with 180K and no issues what so ever. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I have an 07 Silverado 1500 ltz. Once the lifter has been damaged, the cam is probably also damaged. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). It has plenty of oil pressure and I put all new lifters in it. It has 8,000 miles on it. I was getting ~ 30 mpg, so I love that. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Pulled the inntake and replaced valleypan With all the solenoids. They may be able to find some of those missing ponies. .or something similar . It prevents the computer from switching over to four-cylinder mode. I still get a P0336 code every once in a while but still good to drive around town. The exhaust valve remains open during the intake stroke and closes just before BDC. Its Chrysler and Ford. I had one fail and it chattered the cam to the point that I had to Install a new cam. 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?