AFM Sucks!!! I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. Runs better than new now and no more oil consumpsion!! I have a 12 with 4.8 Silverado 75000 miles On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . My 2011 Tahoe has a LMG motor in it with a build date of May 2011. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. TheAFMsystem can be identified by its components. I cant really tell from driving. Once the failure has occurred, the AFM shut off methods other than that probably wont work. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. 1. But the problem at that time was the computer technology. Dod is the biggest failure sence the 8-6-4 caddie in 1981. Changing the sensor didnt help. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Another option is to plug it entirely if the AFM is already removed. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). This lowers the cost of building it [], [] aluminum block engine. it is the regulator guy! Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Covers me to 100K. This really sucks. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). I know I felt the same way. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Yeh truck has 5237 miles on it Service manager said nothing else needs to be replaced because the engine has a Teflon coating. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM The 2016+ Tacomas are junk. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. No other V-8 truck of similar weight can do that (except another GM with AFM). From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? I have a 2012 Chevy Avalanche. 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. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. 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. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. . 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? I couldnt agree with you less, yet I respect your opinions. AFMengines use special lifters for cylinders 1, 4, 6, and 7. Replaced all lifters. Hello! I also notice that it doesnt go into V4 when it is cold. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. the extra oil isnt needed. i just bought a 2018 Silverado with the 5.3 The trucks are only supposed to use two four. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Chevrolet 5.3 Engine Issues and Recommendations 4,7 plugs foul runs rough at idle. 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. If the 4th cylinder lifter has failed, would driving it damage the engine? You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. Theyre also notorious for bad cam tower oil leaks. Had nothing but trouble out of it. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Next day, fired it up to take the the junk yard and it ran great. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Truck has an active P0300 code and runs very rough. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Welcome to socialism folks . 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. Now I get 24 to 26 with deactivation locked out and full power. Engine starts but is throwing a misfire on cyls 4,7. 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. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. 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. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. Where can I buy a bolt to replace this relief valve ?? New plugs and wires. []. It actavated the lifter? All these comments on the 5.3 are blowing my mind!!!. What makes you think it was a design flaw ? I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. The dealer in Rockhill, SC when asked only said they had not had a problem. I have successfully used a gadget that plugs into the ODBII. 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 []. If possible, will simply not using VVT provide a powerful,good running engine? This system is the most effective way to disable AFM. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Yes thats true. Not sure which direction to go from here. 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. Basically rebuilt most of the engine while in the vehicle. Hi. Disable the afm. They have plastic casing, so you can imagine what will happen with aged plastic. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. 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. After all we bailed them out of bankruptcy. Still have no power. Number 7 cylinder lifters stops moving when truck starts. Any thoughts or suggestions would be appreciated. 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. 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. 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? I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. 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? You cannot compare them to old 350s. will feel like a jerk asking the clerk at lowes to cut them again. It is currently at the dealer having a new long block installed under warranty. 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs. The oil is baked on to every component. Put everything back together proper torque, gakets, valve seals, etc. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. If I had wanted a 4 banger I would have bought one. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Don't even get me started on the shortened life of the cooling, starting and charging systems. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. I had a 2007 Yukon XL 5.3 with the AFM. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. What type of ODBII gadget did you use? Drives way better for my mostly paved road driving. 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. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Send response to [email protected]. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I recently bought a low mileage 2013 Silverado and the lifters collapsed. It will show up as a misfire code in a cylinders 1,4,6, or 7. It replaces the AFM components with standard parts. 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? 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? When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. My question is: do I install the electronic disabler on the new engine to avoid future issues? I have 217,000+ on it and it never fails meever! September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Having it fixed now, just curious Seems like a problematic design. So now at 168 thousand miles it still runs good but gets bad gass mileage. It has 8,000 miles on it. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . Love the truck so far. Glad I did. What the biggest reported problem with Chevy Silverados? All Cylinders. If someone didnt want to spend gas buy a Toyota. RANGE TECNOLOGY.COM. Whats the next step? 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. 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. More information can be found in the GM TSB bulletin number 10-06-01-008g. I just did the delete and replaced the cam as well. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. I can literally drive from Seattle to Redding CA on one tank. . A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. 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). He unstuck it and I took it for a drive and same thing happened. However, they are only functional on engines that usedAFM. 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 would rather stay a V8 full time than deal with AFM issues in the future. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. I would. Call chevy.They should being paying most of that. You may want to update your post. 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. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. hi brian when you replace the lifters do you have to change the guides also? , Production date on the vehicle is 04/2006 oddly enough. Keith, were happy to help. Would doing the disabler option once I get it back be the right one? You are correct. Verified over hundreds of trips, makes no sense. I asume low oil pressure cant make some of the DOD lifters to malfunction? There are so many more oil passages on engines these days. 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. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. [], I have a 2012 Silverado Z71 bought new. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Cant believe they havent fixed this in a decade. There is a good chance that some of the drivers side lifters decided to go. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone.
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