gm cylinder deactivation problems gm cylinder deactivation problems

Replace the cam or do the delete kit? Its got a hundred forty-five thousand miles on it. Who knew? The write up confuses me. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. I speak from some experience. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Truck ran fine before that. I have read synthetic isnt good for AFM lifters. Unfortunately, I found out about the lifters too late. Learn how your comment data is processed. This lowers the cost of building it [], [] aluminum block engine. Can I (should I) also change to a standard volume oil pump? When you drain the oil at three to four thousand miles its still clean. . 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. All Cylinders. [] 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. 2 15 with 5.3 Sierras both with 100k and With 40000 Double digit MPGs in my 98 K1500 would be a dream lmao. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . 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. 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. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. 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 []. However, they are only functional on engines that usedAFM. Does the Pressure relief vavle ever go bad?? Replaced all 16 lifters due to collapsed lifter on CYl #4. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. Any help would be appreciated. thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . Nine plaintiffs filed the General . Brian, thank you for the quick response. . I asume low oil pressure cant make some of the DOD lifters to malfunction? Because I want to. I have a 2012 Chevy Avalanche. Toyota will be my next truck unless GM owns up and makes wright with consumers. 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). Every one of these engine will have a lifter fail, this is a travesty! Call chevy.They should being paying most of that. Help appreciated. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Now I get 24 to 26 with deactivation locked out and full power. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. I have an 07 Silverado 1500 ltz. 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. 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. Given that, would you recommend buying one of the OBD-II devices to disable AFM? I have had some say that it is the valves and others say that it is the cats plugged. The biggest problem is nobody changes their oil on time. I may just do that Vic. Replaced all lifters. I read something the other day which I found to be funny. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. Install an AFM Delete Kit You also need the disabler installed in your obd connector. 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. My 5.3 is. The valve itself is part number W0133-2574213. [], [] as the LS engine familys hybrid engine in trucks and SUVs. Just one. Welcome to socialism folks . I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! Their tech guys have seen it all and may have some thoughts on this as well. 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. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? 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. Disable the afm. But it also restricts passages that the oil runs through. Most will want to get rid of the AFM immediately. I have 217,000+ on it and it never fails meever! When you eliminate the AFM system, the extra oil is no longer needed. Carbon Build-Up in the Intake Ports. Clean oil is crucial. 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. 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? They layed over night in engine oil before instalation. More information can be found in the GM TSB bulletin number 10-06-01-008g. misfire or anything. The 2016+ Tacomas are junk. Teflon coatings does not last. Thank you. Then again, it should have never been controlling those solenoids. Lost number four has 92,000 miles and was just told I have cam and lifter failure. I guess I might have to call a dealership or GM to get a definite answer on this one. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. 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. In four-cylinder mode, they act like air springs and allow for smooth operation. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. 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 ! Yes, always change all the lifters at once. Keith, were happy to help. I am having that done today on my 08 Suburban and its only costing me $225. The dealer in Rockhill, SC when asked only said they had not had a problem. All Gen IV engine blocks haveAFMtowers and oil passages cast in. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? So for all of you that continue to complain about how bad these things are. I will keep reading and take notes. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. There are 5.3 cylinder deactivation problems that can occur. I dont know where to being to look for the problem. . Very expensive repair too! Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? I had the same issue and had to have the AFM information deleted from the computer and the car tuned. 330-630-0240. AFMlifters have a history of failing and oil consumption can be a problem. 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. The older truck gets 19 mpg the newer truck with fuel management gets 14. Ive only put a straight pipe exhaust, intake, and a boost controller on it. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Yes a poor design but a flaw ? 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? Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. On one hand it has an aluminum block, which is nice. My daughters car had about 230,000 miles when she complained of the problem. Having it fixed now, just curious Seems like a problematic design. Not sure which direction to go from here. Just recently, GM announced a temporary closure. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Im curious as to how much tran fluid you put in? 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! Since no air can get in or out, four cylinders provide no power. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. Cylinder Deactivation to the Rescue. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. Thankfull for any ideeas! 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. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Is there any reaction to the disabler when pulling a boat or trailer? Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. She had driven it for a couple of months that way. How do you know if the lifter has failed? General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. Last GM Ill ever buy unless its got a diesel. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Install the disabler when you get your Yukon back and it will remain in good working order. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Would never take it on a long trip. 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. 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 have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. 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. Solenoids, new lifters also test voltage to solenoid pack all good their, Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Never did strand me on the side of the road way. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Definitely dont want to do anything to fix one problem and create another. Constant engine and transmission problems. 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. 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? September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. It is usually first noticed during highway driving. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Replacing engine due to issues caused by AFM. I would say maybe 5% of my customers keep up on their oil changes. Ayush Srivastava My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. What makes you think it was a design flaw ? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM That might show up if you cut the filter and looked for debris in the pleats. Im crossing my fingers it does the trick! Change your oil. Not sure what else it can be. 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. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. 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. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. GM switched over to the 4100 v-8 in 1982. Whats the next step? Diablo says yes but they do not provide tunes. It depends on the failure mode of the lifter however, certainly worth a try. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? will feel like a jerk asking the clerk at lowes to cut them again. Pulled the inntake and replaced valleypan With all the solenoids. GM claims fuel improvements ranging from 5%-15% depending on the engine. Billy, there is some interesting trivia here on the L92. This is what I keep telling people. It only has about 9k miles on it. It does seem that when they start goingthey go quickly. Thats a tough call, if the warranty will cover itId let it run out. 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 vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Took the heads off again. No other V-8 truck of similar weight can do that (except another GM with AFM). The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. 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??? so the trans fluid worked for you then? It has 8,000 miles on it. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. My 5.3 has a vin code of O. But if you dont like it. We chickened out though and just bolted the AFM solenoid plate onto the used engine. any help? It is currently at the dealer having a new long block installed under warranty. Required fields are marked *. Most will want to get rid of the AFM immediately and VVT isnt for []. The computers had not evolved enough to control the sytem. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Ill Never Ever buy another gm. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. lol. Now you tell me AFM works and I will tell you; that you are full of shit! I also notice that it doesnt go into V4 when it is cold. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Glad I did. So I did the job one more time. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Its not GMs choice to use AFM. The exhaust valve remains open during the intake stroke and closes just before BDC. I would rather stay a V8 full time than deal with AFM issues in the future. A 17 with 5.3. Hi Mike, the metal shield you noticed is probably the windage tray. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. im going to plug in a dissabler when im done to keep it V8 mode all the time. Found that all passenger side cylinders are not firing. It came back on last Wednesday starting with a flash. But not sure very annoying. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). However, the fuel savings are not always as much as expected. The collapsed lifters will not engage the pushrods and both valves remain closed. bought at Brian Tooley Racing ! We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Will this AFM DISABLER damage anything???. Any advice that you could offer would be great. IMHO . AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. 1. Just one or two. Do you think I can still disable AFM? My 2002 I had over 298K on it with no engine related issues. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. She drove it for another 35,000 and it went out again. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. 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. But the problem at that time was the computer technology. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. If possible, will simply not using VVT provide a powerful,good running engine? Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. 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. how many miles do you have on your engine? Everything was fine for two weeks, ow customer complains s it same noise it made as before. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? A 14 gmc 5.3 Sierra 85000 miles There are so many moving components in an engine these days as opposed to the past. You cannot compare them to old 350s. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). I havent has any lifter or cam issues. Why this happens is a more . Fortunately I received a reducing in house shop hourly rate. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. We were getting a code that the cam position sensor was not functioning properly. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes I have an 07 Yukon with over 180K. (Bought car 1 day before lifter died!) I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Wed recommend a call to our partners at Summit Racing. The detergent. All New lifters were from AC delco. It could be the filter screen under the oil sending unit. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. I am confused about the plug in disabler. GM uses 3 different styles all are engine specific. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. 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. Should I buy one to disable the V4 mode? Oil flows to the special lifters through theAFMtowers. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Can you tell me what needs to be done with the VVT? I cant really tell from driving. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. 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. One the other hand, it came without AFM, VVT, or flex fuel capability. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Have a lifter problem on my 2010 5.3 Silverado. I ran 0W-20 on more the 5000 miles between changes. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. What would you do if you were in my situation? Any guidance would surely be appreciated.