also in the pan is another AFM oil filter near the external engine oil filter. Where can I buy a bolt to replace this relief valve ?? The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Cant believe they havent fixed this in a decade. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. 330-630-0240. If I had wanted a 4 banger I would have bought one. The problem:. Not sure what else it can be. Now I get 24 to 26 with deactivation locked out and full power. 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? Its not possible to install them wrong? Was a disaster then but a profitable disaster. I ran 0W-20 on more the 5000 miles between changes. Just one. Excess oil will be pushed out of the pressure relief valve into the oil pan. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . I have 217,000+ on it and it never fails meever! I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. My 5.3 is. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Ill Never Ever buy another gm. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Nine plaintiffs filed the General . The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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 also heard that the oil pump is to be changed and I have also heard that it does not matter. It is usually first noticed during highway driving. Any thoughts or suggestions would be appreciated. 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. You could also have tried that if the trans oil didnt work. Everything was fine for two weeks, ow customer complains s it same noise it made as before. I have a 2014 Silverado with a 5-3. Thanks for the detailed post! 2011 Chevy Avalanche LTZ. Easier said than done. They have plastic casing, so you can imagine what will happen with aged plastic. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Oil 0w or 5w -20 Cylinder Deactivation to the Rescue. So for all of you that continue to complain about how bad these things are. Have not had a problem yet. Junk . One must anticipate this. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. This is in response to pretty much everyone. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? I have read synthetic isnt good for AFM lifters. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Yes, always change all the lifters at once. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Looking to tear down myself. The dealer in Rockhill, SC when asked only said they had not had a problem. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. The valve itself is part number W0133-2574213. There has been a lifter noise since I bought the truck 1 year ago. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. I quites down to nothing after running for about a minute. what deleter (if thats a real word) have you heard good things about. The collapsed lifters will not engage the pushrods and both valves remain closed. Just pulled it down in the garage there was no other damage , luckily. Love the truck. After all we bailed them out of bankruptcy. I noticed this discussion mainly addresses Chevy Silverados and other trucks? My 2011 Tahoe has a LMG motor in it with a build date of May 2011. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. 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. 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. With the nipple, or without? 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 . Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. 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. i just bought a 2018 Silverado with the 5.3 http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Runs better than new now and no more oil consumpsion!! Install ls3 valley cover. Then I guess I have to spend a bunch of money and get the delete kit. Can I (should I) also change to a standard volume oil pump? After reading these forums Im a little concerned about my decision to stay with GM. 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 Hi Brian, This system is the most effective way to disable AFM. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. We need availability of a replacement engine without the AFM. Install the disabler when you get your Yukon back and it will remain in good working order. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. Because I want to. 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. What was happening to the first is slowly (or quickly in your case) happening to the others. Most of the complaints show up in the 2009 to 2011 model years. Keith, were happy to help. Everything else looked good. It is currently at the dealer having a new long block installed under warranty. 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? There may be an ignition related issue on that cylinder. What makes you think it was a design flaw ? Cost about $250, but it is not fool proof. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Brian, 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. 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. If someone didnt want to spend gas buy a Toyota. He used seafoam and changed to synthetic oil. 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. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I would rather stay a V8 full time than deal with AFM issues in the future. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. I asume low oil pressure cant make some of the DOD lifters to malfunction? I have a 12 with 4.8 Silverado 75000 miles How do you know if the lifter has failed? The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. 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. do you fill to capacity anyways???? It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. [] they have a downside? Now I know why there wa such a push to get older ,less efficient vehicles off the roads. A 17 with 5.3. [] 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. [], [] way. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Learn how your comment data is processed. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Corvette that does employ AFM. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. My question on a 2007 Chevy Tahoe 5.3 AFM The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. I have a 2013 1500 with the LC9. 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. Perhaps a flaw by design would be a more appropriate description . Truck ran fine before that. GM uses 3 different styles all are engine specific. 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. The engine has flex-fuel capability. The 2nd went with a conventional valvetrain. Its ribbed with solenoids on the underside. The car runs great apart from the shuddering at those speeds. Mine did at the exact same time. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Engine starts but is throwing a misfire on cyls 4,7. 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. The original version sprayed oil on the cylinder walls and increased oil consumption. In four-cylinder mode, they act like air springs and allow for smooth operation. please respond with your opinion. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Disable the afm. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Only running on drivers side cylinders. This new lawsuit is essentially identical to the previous. Toyota will be my next truck unless GM owns up and makes wright with consumers. Change your oil. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. I have no clue what to do now. What type of disabler did you go with? Regards, Thank you again for the response. The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5). This happened on a camping trip with my kids last friday night. If you ignore it and keep driving, odds are you will destroy the cam as well. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. I know I felt the same way. She started to have the lifter problem again after 60,000 miles more. This is what I keep telling people. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. Fouls those plugs. I am trying to find out of this is true. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Will this AFM DISABLER damage anything???. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! 2 15 with 5.3 Sierras both with 100k and AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I still get a P0336 code every once in a while but still good to drive around town. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. 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? The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. But not sure very annoying. Would doing the disabler option once I get it back be the right one? Then changed the oil. the extra oil isnt needed. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. But if you dont like it. 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. A 17 with 5.3. 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 have an 07 Yukon with over 180K. . Battery was unplugged for a week.. It essentially turns your V8 engine into a V4 which saves fuel. That might show up if you cut the filter and looked for debris in the pleats. TheAFMcylinders are opposite of one another in the firing order. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy No movement on the rocker arms. I speak from some experience. Having it fixed now, just curious Seems like a problematic design. AFMengines use special lifters for cylinders 1, 4, 6, and 7. I read something the other day which I found to be funny. Engine oil pressure is fine. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. . It has has 9000 miles and no lifter or other issues or codes so far. Welcome to socialism folks . I am confused about the plug in disabler. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. Pulled right valve cover an rockers on syl 6 dont move. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. You are correct. 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. 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. .IMHO . Diablo says yes but they do not provide tunes. But it also restricts passages that the oil runs through. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! IMHO . 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. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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 []. Thanks. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Most will want to get rid of the AFM immediately. 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. 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. 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 []. I tried the trans fluid in the oil. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Seafoam with syn oil change only fixed for a week. . I dont know where to being to look for the problem. The result is improved combustion chamber pressure as the piston approaches top . The engine is running on only four cylinders. Didnt change exhaust nor tune so likely no change in power/torque. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. The oil is baked on to every component. This is my project car and will be my drive (about 5000 miles a year). It also mentions a valve cover replacement with revised PCV valve design. I may just do that Vic. If you just crack it without it starting it moves all the time . .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. Sylinder one lost compression on my 09 5,3. 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. If possible, will simply not using VVT provide a powerful,good running engine? Billy, there is some interesting trivia here on the L92. A 14 gmc 5.3 Sierra 85000 miles It has 8,000 miles on it. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. I call it active obama fuel management .A scam . Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! Brian, thank you for the quick response. I went with the new motor for the warranty. Only thing I noticed with the oil consumption issue. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? There is a good chance that some of the drivers side lifters decided to go. No clue what to do. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I got the AMF disabler anyway and so far so good. 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.
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