Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. They are taller and have special oil holes. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? I am hoping this does the trick. Install the disabler when you get your Yukon back and it will remain in good working order. stalled in a certain way a warning wouldn be a bad idea. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. All Cylinders.
The Hit and Miss Nature of Cylinder Deactivation Systems I wont bother with blocking the relief valve. She started to have the lifter problem again after 60,000 miles more. Disable the afm. 2 15 with 5.3 Sierras both with 100k and I just bought a 2018 Silverado. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Any thoughts or suggestions would be appreciated.
PDF GM LS AFM Deactivation Lifter Issues - Melling Did Obama make them do this? Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. I recently bought a low mileage 2013 Silverado and the lifters collapsed. IMHO . The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. [], I have a 2012 Silverado Z71 bought new. Nine plaintiffs filed the General . Perhaps a flaw by design would be a more appropriate description . Hi. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. Why cant u just unplug the solenoid on back of engine by oil pressure sensor?
Active Fuel Management - Wikipedia Keith, were happy to help. 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. 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.
GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs If buying a tuner/chip which works best for that truck/engine? My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. But the problem at that time was the computer technology. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications.
AFM/DFM Disabler - Range Technology 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? It essentially turns your V8 engine into a V4 which saves fuel. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. Had similar problems under warranty, no telling what they rigged me up with at the dealer. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. im going to plug in a dissabler when im done to keep it V8 mode all the time. It was well researched and tested back in the late seventies and eighties .
GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 The oil is baked on to every component. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Do you think I can still disable AFM? No it runs fine on sylinder one but not on 6 or 7!!! 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. I ave noticed the point about excess oil spray. A 17 with 5.3. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. , Production date on the vehicle is 04/2006 oddly enough. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Dont drive it if you have a dead cylinder due to afm failure. However, they are only functional on engines that usedAFM. 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 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 []. My Wifes 17 Buick with afm was my attempt to get back to gm. misfire or anything. 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. I have a 2013 1500 with the LC9. 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. Friend will send to me from Arizona. 2 15 with 5.3 Sierras both with 100k and The 2nd went with a conventional valvetrain. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 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. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. The system uses solenoids to deliver oil pressure to control. Remembered that after I bought my Tahoe. whith a disabler. . Constant engine and transmission problems. Now Im here tring to figure out what to do. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. 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. I am trying to find out of this is true. But not sure very annoying. How did your turn out? Junk . I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! $8500.00 fix. We believe this confirmed that the AFM has never been operating in this vehicle. Told her that it would not last and that she needed to find a different way to get around. 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. NOT GOOD!! http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Will this AFM DISABLER damage anything???. Number 7 cylinder lifters stops moving when truck starts. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Just shut AFM off. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. 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. Cylinders two, three, and eight are all similar in cylinder deactivation. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Regards, I can literally drive from Seattle to Redding CA on one tank. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? the body is in great shape. I speak from some experience. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. I know I felt the same way. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Who knew? Ditto , never buy a throw away vehicle again is my recommendation and my fix . A 14 gmc 5.3 Sierra 85000 miles The trucks are only supposed to use two four. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. I have 217,000+ on it and it never fails meever! 1. I had a 2007 Yukon XL 5.3 with the AFM.
PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 A 17 with 5.3. If possible, will simply not using VVT provide a powerful,good running engine?
Another General Motors 5.3L V8 Lawsuit Filed | GM Authority This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. 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. Any guidance would surely be appreciated. (Bought car 1 day before lifter died!) If you installed a performance cam intended for a car, it may be bleeding off some low end compression. I ran 0W-20 on more the 5000 miles between changes. I also notice that it doesnt go into V4 when it is cold. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes
GM Active Fuel Management Cylinder Deactivation Technology - GM Authority I am confused about the plug in disabler.
Chevrolet Silverado 2014-Present: Common Problems I only had 81k on the motor. Would it be fine to go ahead with the AFM Disabler? Not sure what else it can be. 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??? That inherently less smooth operation requires additional NVH dampening. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. I plan on getting a tuner to disable the AFM. It seems this tough engine has everything incorporated into it. One must anticipate this. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. is it still working good since you have done that with the trans fluid? Is this an issue only with GM SUVs and trucks, or does it include cars too? Corvette that does employ AFM. If I put my truck in manual 5, it doesnt try to go into V4 mode. What the biggest reported problem with Chevy Silverados? With 40000 The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Mine did at the exact same time. 50,000 miles. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Its not GMs choice to use AFM. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Are you saying that I am in the clear by a year and issues fixed? Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. There is a good chance that some of the drivers side lifters decided to go. Having a hard time finding one .. You were lucky that it worked. Whats the next step? My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Sylinder one lost compression on my 09 5,3. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. GM uses 3 different styles all are engine specific. Regarding the cylinder deactivation impact on fuel consumption . Brian, I have been reading your article about the AFM. It has has 9000 miles and no lifter or other issues or codes so far. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. 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? I have a shop 39 yrs . Drives way better for my mostly paved road driving. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. They dont so any better than domestics on mpgs. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. I have successfully used a gadget that plugs into the ODBII. lol. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . It works . 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. 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. Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Then it takes out the lifter again and again until you bite the bullet and replace the cam. I did noticed the oil consumption but it was rare that I would have to add oil. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. What would you do if you were in my situation? Most of the complaints show up in the 2009 to 2011 model years. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Oil flows to the special lifters through theAFMtowers. Help appreciated. Then again, it should have never been controlling those solenoids.
Disable Active Fuel Management - Ricks Free Auto Repair Advice Its got a hundred forty-five thousand miles on it. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Still have no power. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Double digit MPGs in my 98 K1500 would be a dream lmao. Would installing the Disabler solve this? I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. 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. I have a noise in the engine but it seems to go away when revved up. 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 a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? My 2011 Tahoe has a LMG motor in it with a build date of May 2011. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. GM switched over to the 4100 v-8 in 1982. I have a 07 Yukon with 180K and no issues what so ever. Thanks. I told her to never pull the gadget out. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Yes thats true.
How to Delete or Disable Active Fuel Management (AFM) I have no other engine problems and Id like to fix the issue. Is there any potential down-side to doing this in other words, might this do more harm than good? if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . But then she passed away from cancer. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. The Jury is still out on the Gen. 5s but the warranty could be an issue. Next day, fired it up to take the the junk yard and it ran great. bought at Brian Tooley Racing ! . Im always sorry to hear when people run into issues like these. Thanks for the detailed post! There are no changes in the valves or the springs. 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? They are being forced by the feds to use stuff like AFM to meet the CAFE requirements.
How to Fix GM's Cylinder Deactivation Problems Once the failure has occurred, the AFM shut off methods other than that probably wont work. Thanks for the advice Brian! Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? My daughters car had about 230,000 miles when she complained of the problem. I went with the new motor for the warranty. We need availability of a replacement engine without the AFM. Where can I buy a bolt to replace this relief valve ?? Since the tranny oil worked, you should now change the oil, right? Yeh truck has 5237 miles on it 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. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Carbon Build-Up in the Intake Ports. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy It has the orings in place, that seals the towers. Only thing I noticed with the oil consumption issue. This new lawsuit is essentially identical to the previous. Take a look at what bmw did in its R1250 bike. Seafoam with syn oil change only fixed for a week. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Below youll see references to the L99 as a result. I have no clue what to do now. 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. My fear now is not will it happen but when! At this state, a disabler would probably do what you need it to do. The result is improved combustion chamber pressure as the piston approaches top . My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Engine starts but is throwing a misfire on cyls 4,7. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Fortunately, the old engine hadnt been shipped back to the remanufacturer. 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. 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? Last GM Ill ever buy unless its got a diesel. This should be added to your earlier model if you experience oil consumption. Have there been improvements in more recent model years employing AFM [2014 or newer]? What type of disabler did you go with? The biggest problem is nobody changes their oil on time. 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. All New lifters were from AC delco. Thanks. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. But after reading this thread, Im a little concerned about the long-term reliability. Any advice that you could offer would be great. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Unfortunately, I found out about the lifters too late. My question is: do I install the electronic disabler on the new engine to avoid future issues? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. They lasted one year with big problems. Have a lifter problem on my 2010 5.3 Silverado. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. any help? 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? All Gen IV engine blocks haveAFMtowers and oil passages cast in. Thank you. 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. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Ive only put a straight pipe exhaust, intake, and a boost controller on it. I would say maybe 5% of my customers keep up on their oil changes.
Cylinder deactivation | GM Truck Club Forum Chevy Silverado V8 To V4 Problems - Tools Bible The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. One the other hand, it came without AFM, VVT, or flex fuel capability. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. I have already dropped a lot of money on this truck (08 suburban). Dont want to make a move on a new truck or jump to a 2500 yet. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. 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? It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Shame this happened. Toyota has their own problems. Thanks for your help. Have misfire code and engine has what I would call a surge while driving. Ill Never Ever buy another gm. Loved the looks and interior and thought a I got a great deal at $6k even. 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? Excess oil will be pushed out of the pressure relief valve into the oil pan. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. 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 []. Any help would be appreciated. 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? Any truth to that? A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. Brian, 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. It only has about 9k miles on it.
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