The valve itself is part number W0133-2574213. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Brian, I have been reading your article about the AFM. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Engine oil pressure is fine. All New lifters were from AC delco. If someone didnt want to spend gas buy a Toyota. There are no changes in the valves or the springs. . Welcome to socialism folks . I told her to never pull the gadget out. Would it be fine to go ahead with the AFM Disabler? Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Driver reported this occurred suddenly while driving down the highway. 330-630-0240. I have a noise in the engine but it seems to go away when revved up. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. I dont know where to being to look for the problem. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. I have a 12 wit 4.8 Silverado 75000 miles The Jury is still out on the Gen. 5s but the warranty could be an issue. Replaced all lifters. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. She started to have the lifter problem again after 60,000 miles more. Engine starts but is throwing a misfire on cyls 4,7. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. The computers had not evolved enough to control the sytem. 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 []. "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. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. A tuner can often fix that as well by giving it some more ignition advance in these regions. I will be installing the AFM deactivator tonight when I get hoe. I also notice that it doesnt go into V4 when it is cold. Not sure what else it can be. My daughters car had about 230,000 miles when she complained of the problem. any help? I have no clue what to do now. Did Obama make them do this? Lost number four They have plastic casing, so you can imagine what will happen with aged plastic. I already ordered the parts to replace myself and remove the code. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? The motor I pulled was a 2007 LY5 with about 77k on it. My question on a 2007 Chevy Tahoe 5.3 AFM It seems this tough engine has everything incorporated into it. This is in response to pretty much everyone. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? They took the engine down today found so much damage inside they ordered a new engine from Detroit. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. I will keep reading and take notes. On one hand it has an aluminum block, which is nice. 50,000 miles. 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. I ave noticed the point about excess oil spray. Regarding the cylinder deactivation impact on fuel consumption . in your opinion will this work, i really dont see any reason it wouldnt. , Production date on the vehicle is 04/2006 oddly enough. Yes thats true. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Thanks for your help. Just recently, GM announced a temporary closure. Definitely dont want to do anything to fix one problem and create another. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. I can literally drive from Seattle to Redding CA on one tank. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). TheAFMcylinders are opposite of one another in the firing order. Is this an issue only with GM SUVs and trucks, or does it include cars too? Billy, there is some interesting trivia here on the L92. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Bought an 07 GMC Yukon 5.3 with the AFM, 87k. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Install ls3 valley cover. GM should recall every vehicle with this terrible design flaw! [], I have a 2012 Silverado Z71 bought new. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. 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. 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). This really sucks. I would. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. This should be added to your earlier model if you experience oil consumption. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Most of the complaints show up in the 2009 to 2011 model years. I just bought a 2018 Silverado. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. 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. Didnt change exhaust nor tune so likely no change in power/torque. I have the towing package on my 13 Tahoe LTZ. They are taller and have special oil holes. bought at Brian Tooley Racing ! Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. 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. The car runs great apart from the shuddering at those speeds. She had driven it for a couple of months that way. There are so many more oil passages on engines these days. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Your email address will not be published. Hi. Changing the sensor didnt help. Oil flows to the special lifters through theAFMtowers. I am trying to prevent same issue. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. . 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. I am having that done today on my 08 Suburban and its only costing me $225. TheAFMsystem can be identified by its components. This is what I keep telling people. [], [] as the LS engine familys hybrid engine in trucks and SUVs. But the problem at that time was the computer technology. Now I get 24 to 26 with deactivation locked out and full power. With the nipple, or without? 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. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. .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 just did the delete and replaced the cam as well. Toyota has their own problems. Once the lifter has been damaged, the cam is probably also damaged. Clean oil is crucial. Still have no power. Looking to tear down myself. Ayush Srivastava The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Not sure which direction to go from here. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. [], [] way. [] they have a downside? Cylinder Deactivation to the Rescue. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. I ran 0W-20 on more the 5000 miles between changes. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Because I want to. Cost about $250, but it is not fool proof. All these comments on the 5.3 are blowing my mind!!!. Now you tell me AFM works and I will tell you; that you are full of shit! [] 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. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. Yes a poor design but a flaw ? Whats the next step? Should I wait until the warranty runs out, or will that be too late to stop possible damage? I did noticed the oil consumption but it was rare that I would have to add oil. Ill Never Ever buy another gm. No clue what to do. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. i just bought a 2018 Silverado with the 5.3 stalled in a certain way a warning wouldn be a bad idea. thank You so much! The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Glad I did. 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. []. Hopefully more is known by then. There has been a lifter noise since I bought the truck 1 year ago. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Can you tell me what needs to be done with the VVT? I have already dropped a lot of money on this truck (08 suburban). When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. im going to plug in a dissabler when im done to keep it V8 mode all the time. hi brian when you replace the lifters do you have to change the guides also? 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. This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? I noticed this discussion mainly addresses Chevy Silverados and other trucks? But not sure very annoying. My Wifes 17 Buick with afm was my attempt to get back to gm. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. I have an 07 Yukon with 230k on the engine. I have an 07 Yukon with over 180K. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Below youll see references to the L99 as a result. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. It only has about 9k miles on it. How is that an improvement. I went with the new motor for the warranty. So for all of you that continue to complain about how bad these things are. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. I cant really tell from driving. The LZ1 was upgraded with AFM and []. Its not GMs choice to use AFM. I have a 2011 GMC with over 162,000 miles on it and it runs great! However, the fuel savings are not always as much as expected. Just pulled it down in the garage there was no other damage , luckily. That inherently less smooth operation requires additional NVH dampening. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. The older truck gets 19 mpg the newer truck with fuel management gets 14. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. It has AMF. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Replaced all lifters on passenger side as well as pushrods for even wear. But then she passed away from cancer. I called my service station and they told me to get it in ASAP. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. Does the Pressure relief vavle ever go bad?? Toyota will be my next truck unless GM owns up and makes wright with consumers. Also putting in a new transmission vs. rebuilding. When you drain the oil at three to four thousand miles its still clean. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. We need availability of a replacement engine without the AFM. 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. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. 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. Diablo says yes but they do not provide tunes. 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. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Ketil, let us know what you find out. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. What makes you think it was a design flaw ? 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. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Put everything back together proper torque, gakets, valve seals, etc. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. 190k on the motor always ran AMSOIL full synth since new. Will this AFM DISABLER damage anything???. Hello! 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? The engine is running on only four cylinders. More information can be found in the GM TSB bulletin number 10-06-01-008g. Any problems to watch out for?Did you replace the VLOM? They layed over night in engine oil before instalation. Its ribbed with solenoids on the underside. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Thanks. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. It is currently at the dealer having a new long block installed under warranty. Did not help. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Ditto , never buy a throw away vehicle again is my recommendation and my fix . 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 would appreciate it if you let me know how you make out. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. There are 5.3 cylinder deactivation problems that can occur. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? What would you do if you were in my situation? Thank you. Looking forward to input from the forum, Thank you. Just one or two. Send response to tkrieg@cox.net. I dont plan on installing the delete kit at this time. Was a disaster then but a profitable disaster. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . 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.