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. 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. It essentially turns your V8 engine into a V4 which saves fuel. Im curious as to how much tran fluid you put in? 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. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? 330-630-0240. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . 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. It prevents the computer from switching over to four-cylinder mode. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. All the time. All New lifters were from AC delco. Just recently, GM announced a temporary closure. A 14 gmc 5.3 Sierra 85000 miles She started to have the lifter problem again after 60,000 miles more. Brian, I have the same question as Scott. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? There may be an ignition related issue on that cylinder. Thank you for your time. They have plastic casing, so you can imagine what will happen with aged plastic. It also has an electrical connector on the back. 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. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Was a disaster then but a profitable disaster. Not sure which direction to go from here. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. 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? 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. You also need the disabler installed in your obd connector. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. Hi Mike, the metal shield you noticed is probably the windage tray. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Below youll see references to the L99 as a result. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Now you tell me AFM works and I will tell you; that you are full of shit! stalled in a certain way a warning wouldn be a bad idea. I have an 07 Silverado 1500 ltz. 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. "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. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Where can I buy a bolt to replace this relief valve ?? . I had a 2007 Yukon XL 5.3 with the AFM. I am trying to prevent same issue. Regarding the cylinder deactivation impact on fuel consumption . Regards, Is the Pressure relief valve replaceable? It depends on the failure mode of the lifter however, certainly worth a try. Dont drive it if you have a dead cylinder due to afm failure. It could be the filter screen under the oil sending unit. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. If I put my truck in manual 5, it doesnt try to go into V4 mode. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. I always have done my oil changes on time, not sure about the people who owned it before me though. whith a disabler. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. A tuner can often fix that as well by giving it some more ignition advance in these regions. Yes thats true. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Truck has an active P0300 code and runs very rough. 2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! I would rather stay a V8 full time than deal with AFM issues in the future. I call it active obama fuel management .A scam . Had similar problems under warranty, no telling what they rigged me up with at the dealer. misfire or anything. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. This is my second Avalanche and I never had any issues with either of them. Teflon coatings does not last. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. I have successfully used a gadget that plugs into the ODBII. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Im servicing a 2011 Chevrolet 5.3 with AFM. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. Battery was unplugged for a week.. It replaces the AFM components with standard parts. 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. The engine had 200K miles. Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority I asume low oil pressure cant make some of the DOD lifters to malfunction? The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. I plan on getting a tuner to disable the AFM. Welcome to socialism folks . 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. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. I have a 12 wit 4.8 Silverado 75000 miles Open to suggestions about best course of action. Drives way better for my mostly paved road driving. The valve itself is part number W0133-2574213. Oil 0w or 5w -20 I dont plan on installing the delete kit at this time. Im always sorry to hear when people run into issues like these. Thats not all bad because it saves the cost of an AFM delete kit. He used seafoam and changed to synthetic oil. Run it and let it soak overnight. I hate it. This new lawsuit is essentially identical to the previous. With 40000 Another General Motors 5.3L V8 Lawsuit Filed | GM Authority Replaced all 16 lifters due to collapsed lifter on CYl #4. I speak from some experience. 2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue 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. Keith, were happy to help. There has been a lifter noise since I bought the truck 1 year ago. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Any guidance would surely be appreciated. I had one fail and it chattered the cam to the point that I had to Install a new cam. The oil collapses the plunger inside the lifter. 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 have had some say that it is the valves and others say that it is the cats plugged. im going to plug in a dissabler when im done to keep it V8 mode all the time. It has AMF. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Why would GM ever produce such problems with such little to gain. Is there any potential down-side to doing this in other words, might this do more harm than good? Now Im here tring to figure out what to do. There is a chance the cam lobe was stressed and started to deteriorate. I ran 0W-20 on more the 5000 miles between changes. 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. My question is: do I install the electronic disabler on the new engine to avoid future issues? Yeh truck has 5237 miles on it 5.3-liter Chevy Engine Problems: What Should You Look Out For? The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. 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. the body is in great shape. At this state, a disabler would probably do what you need it to do. 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. The Hit and Miss Nature of Cylinder Deactivation Systems The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Im confused from the write up about the plug in. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority Told her that it would not last and that she needed to find a different way to get around. I told her to never pull the gadget out. Don't even get me started on the shortened life of the cooling, starting and charging systems. I called my service station and they told me to get it in ASAP. It works . 4,7 plugs foul runs rough at idle. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. When you eliminate the AFM system, the extra oil is no longer needed. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). 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. 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. That inherently less smooth operation requires additional NVH dampening. Im crossing my fingers it does the trick! In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Some guys have been able to use a tool through the top with the cover off to get it to release. Does the disabler prevent the engine damage in the first place? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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). I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. I will be installing the AFM deactivator tonight when I get hoe. [], [] way. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Todays computers are faster so it does work. Engine starts but is throwing a misfire on cyls 4,7. You cannot compare them to old 350s. If you are using VVT, you could use the NAL-12612273 (L92) cam. 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. 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. I have an 07 Yukon with over 180K. Send response to tkrieg@cox.net. 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. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. It does seem that when they start goingthey go quickly. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Changing the sensor didnt help. GM claims fuel improvements ranging from 5%-15% depending on the engine. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. Perhaps a flaw by design would be a more appropriate description . This allows the engine to run in V8 mode. 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. Are there errors or something only the dealer can clear? Not sure what else it can be. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. I ran 0W-20 no more the 5000 miles between changes. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. Nine plaintiffs filed the General . How long did it take? You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. What type of ODBII gadget did you use? I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? It is usually first noticed during highway driving. The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. I did noticed the oil consumption but it was rare that I would have to add oil. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? . I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. 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. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. The dealer in Rockhill, SC when asked only said they had not had a problem. I cant really tell from driving. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? . From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? However, they are only functional on engines that usedAFM. I recently took a long trip and it burned 1.5 quarts of oil. Your email address will not be published. AFM Sucks!!! We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Very expensive repair too! (Non-AFM engines have a smooth cover.). thank You so much! Would installing the Disabler solve this? Chevrolet Silverado 2014-Present: Common Problems NOT GOOD!! He unstuck it and I took it for a drive and same thing happened. But after reading this thread, Im a little concerned about the long-term reliability. My 5.3 is. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? It uses a M14 x 1.5 thread plug like Dorman 65217. No problems with any to this point. What Is Hemi MDS? - MotorTrend I just bought a 2018 Silverado. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? After reading these forums Im a little concerned about my decision to stay with GM. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Brian, Should I buy one to disable the V4 mode? I may just do that Vic. Here's what you need to know: 1. I got the AMF disabler anyway and so far so good. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in It only has about 9k miles on it. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. If you installed a performance cam intended for a car, it may be bleeding off some low end compression.