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. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Will this AFM DISABLER damage anything???. The original version sprayed oil on the cylinder walls and increased oil consumption. So I researched and got an AFM disabler. TheAFMcylinders are opposite of one another in the firing order. But it also restricts passages that the oil runs through. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Found that all passenger side cylinders are not firing. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. I have 217,000+ on it and it never fails meever! Just pulled it down in the garage there was no other damage , luckily. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Change your oil. Carbon Build-Up in the Intake Ports. On the AFM lifters that dosnt work i have installed them With the oil hole Down! 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. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. 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 have a 2012 Silverado Z71 bought new. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Easier said than done. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. This is my second Avalanche and I never had any issues with either of them. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Run it and let it soak overnight. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. The oil is baked on to every component. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. I have a 2013 1500 with the LC9. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. With 44, its a enormous Jon to remove the oil pan. $8500.00 fix. Seafoam with syn oil change only fixed for a week. Welcome to socialism folks . I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). With 40000 I always have done my oil changes on time, not sure about the people who owned it before me though. The detergent. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. I am confused about the plug in disabler. I have an 07 Yukon with 230k on the engine. The 2016+ Tacomas are junk. Only running on drivers side cylinders. 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. 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. Regardless of the AFM solenoid being commanded on or off. im going to plug in a dissabler when im done to keep it V8 mode all the time. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? He used seafoam and changed to synthetic oil. Engine starts but is throwing a misfire on cyls 4,7. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. If possible, will simply not using VVT provide a powerful,good running engine? If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Im curious as to how much tran fluid you put in? a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. As you said, the ECM was never seeing the AFM so I think youre good to go. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. I just did the delete and replaced the cam as well. Pod. Should I wait until the warranty runs out, or will that be too late to stop possible damage? Another option is to plug it entirely if the AFM is already removed. I already ordered the parts to replace myself and remove the code. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. 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. Do not pay that amount. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. The Jury is still out on the Gen. 5s but the warranty could be an issue. AFM Sucks!!! 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. It is being covered under warranty since I only have 72,000 miles on it. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. . At this state, a disabler would probably do what you need it to do. 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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? There may be an ignition related issue on that cylinder. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. What type of disabler did you go with? Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? I am hoping this does the trick. Now you tell me AFM works and I will tell you; that you are full of shit! I have a noise in the engine but it seems to go away when revved up. 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 []. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Not sure which direction to go from here. 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. No other V-8 truck of similar weight can do that (except another GM with AFM). Diablo says yes but they do not provide tunes. Should I buy one to disable the V4 mode? As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. Replaced all lifters on passenger side as well as pushrods for even wear. How long did it take? The lifter seems to recharge whenever the truck sits for some time. This basically deactivates the cylinder deactivation system. 2011 Chevy Avalanche LTZ. 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. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Billy, there is some interesting trivia here on the L92. (Bought car 1 day before lifter died!) Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I guess I might have to call a dealership or GM to get a definite answer on this one. , Production date on the vehicle is 04/2006 oddly enough. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. GM switched over to the 4100 v-8 in 1982. 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. It will show up as a misfire code in a cylinders 1,4,6, or 7. Install ls3 valley cover. 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. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. I recently bought a low mileage 2013 Silverado and the lifters collapsed. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. . Help appreciated. The car runs great apart from the shuddering at those speeds. It prevents the computer from switching over to four-cylinder mode. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. 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. 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). [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. After reading these forums Im a little concerned about my decision to stay with GM. Runs better than new now and no more oil consumpsion!! Then changed the oil. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. 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. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. how many miles do you have on your engine? Very confusing stuff out there. I ran 0W-20 on more the 5000 miles between changes. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Hi. Thanks for the detailed post! Disable the afm. I still get a P0336 code every once in a while but still good to drive around town. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. How is that an improvement. You may want to update your post. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Most of the complaints show up in the 2009 to 2011 model years. Toyota will be my next truck unless GM owns up and makes wright with consumers. It was well researched and tested back in the late seventies and eighties . Most will want to get rid of the AFM immediately and VVT isnt for []. "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. What would you do if you were in my situation? Pulled right valve cover an rockers on syl 6 dont move. Now I get 24 to 26 with deactivation locked out and full power. The 2nd went with a conventional valvetrain. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. It replaces the AFM components with standard parts. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Mine did at the exact same time. 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? 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. Engines with AFM use a high-volume oil pump. Because its not just GM that have engine problems. Ive been reading, with disgust and concern of the lifter/cam situation. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. No movement on the rocker arms. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. There is a good chance that some of the drivers side lifters decided to go. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy . One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Teflon coatings does not last. 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. Fortunately I received a reducing in house shop hourly rate. Would installing the Disabler solve this? This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. My 5.3 has a vin code of O. Verified over hundreds of trips, makes no sense. Im always sorry to hear when people run into issues like these. Looking to tear down myself. I own a reputable repair shop. 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.