gm cylinder deactivation problems

And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Perhaps a flaw by design would be a more appropriate description . the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Mine did at the exact same time. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. My 5.3 has a vin code of O. The collapsed lifters will not engage the pushrods and both valves remain closed. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. I asume low oil pressure cant make some of the DOD lifters to malfunction? Or not because it is the cast iron block and not he aluminum block? I have a noise in the engine but it seems to go away when revved up. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Help appreciated. The engine had 200K miles. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? Every one of these engine will have a lifter fail, this is a travesty! Chris, when you did your delete, did you also change the cam at the same time? Keith, were happy to help. Truck ran fine before that. Ayush Srivastava These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). 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! I was getting ~ 30 mpg, so I love that. I sold them when they were new. Learn how your comment data is processed. Send response to tkrieg@cox.net. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. 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). The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Im praying that my RangeTech buys me a few years. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. 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). It is replaceable.. just remove oil pan and it will be on top at the filter. The only solution is to replace the entire cylinder head. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. 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. Wed recommend a call to our partners at Summit Racing. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. 1981 Cadillac V 864. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Can I (should I) also change to a standard volume oil pump? 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 []. I have a 12 wit 4.8 Silverado 75000 miles 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 []. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I had one fail and it chattered the cam to the point that I had to Install a new cam. How did your turn out? The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Hello! All New lifters were from AC delco. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . (Non-AFM engines have a smooth cover.). Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. it is the regulator guy! He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. Any guidance would surely be appreciated. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Todays computers are faster so it does work. 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. All the time. Theyre also notorious for bad cam tower oil leaks. I tried the trans fluid in the oil. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Having it fixed now, just curious Seems like a problematic design. Regarding the cylinder deactivation impact on fuel consumption . 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 . Yes thats true. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . All ready done valve job . Next day, fired it up to take the the junk yard and it ran great. A 14 gmc 5.3 Sierra 85000 miles The lifter seems to recharge whenever the truck sits for some time. Since the tranny oil worked, you should now change the oil, right? 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. It was good for about 10 miles and started with same loud knock noise. No problems with any to this point. Its a CA EMMISIONS TRUCK. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). If the 4th cylinder lifter has failed, would driving it damage the engine? The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. No clue what to do. Engines with AFM use a high-volume oil pump. Fortunately, the old engine hadnt been shipped back to the remanufacturer. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. If so what would the vin code be? Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. You also need the disabler installed in your obd connector. [], [] way. I read something the other day which I found to be funny. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Just pulled it down in the garage there was no other damage , luckily. My 2002 I had over 298K on it with no engine related issues. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). AFM - active fuel management strategy which deactivates the lifters on specific . If you left the original cam in, the AFM cylinders will be down about 25 lbs. I would. Cant believe they havent fixed this in a decade. Engine starts but is throwing a misfire on cyls 4,7. Most of all, my concern is reliability. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. What type of ODBII gadget did you use? Toyota will be my next truck unless GM owns up and makes wright with consumers. I got the AMF disabler anyway and so far so good. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? 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. The biggest problem is nobody changes their oil on time. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). I know I felt the same way. 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. 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? Im servicing a 2011 Chevrolet 5.3 with AFM. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Only running on drivers side cylinders. If I put my truck in manual 5, it doesnt try to go into V4 mode. The wife however found this deal on an Envoy Denali . I guess I might have to call a dealership or GM to get a definite answer on this one. It will show up as a misfire code in a cylinders 1,4,6, or 7. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. You may want to update your post. What type of disabler did you go with? Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Just recently, GM announced a temporary closure. Teflon coatings does not last. I would say maybe 5% of my customers keep up on their oil changes. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. 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. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . 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. Just one. Take a look at what bmw did in its R1250 bike. What makes you think it was a design flaw ? 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. Would it be fine to go ahead with the AFM Disabler? Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Billy, there is some interesting trivia here on the L92. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). But it also restricts passages that the oil runs through. I have a shop 39 yrs . Excess oil will be pushed out of the pressure relief valve into the oil pan. Have a lifter problem on my 2010 5.3 Silverado. I have a 2014 Silverado with a 5-3. GM offers the following diagnostic steps in determining if this is the problem. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. One the other hand, it came without AFM, VVT, or flex fuel capability. 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. Hi. Would never take it on a long trip. It has the orings in place, that seals the towers. After reading these forums Im a little concerned about my decision to stay with GM. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Your email address will not be published. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. 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 . If the lifter actually fails so that the mechanism wont release, it wont work. Any thoughts or suggestions would be appreciated. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Toyota has their own problems. It does seem that when they start goingthey go quickly. , Production date on the vehicle is 04/2006 oddly enough. bought at Brian Tooley Racing ! Would doing the disabler option once I get it back be the right one? Cylinders two, three, and eight are all similar in cylinder deactivation. Didnt change exhaust nor tune so likely no change in power/torque. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. 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. I speak from some experience. 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. 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. It essentially turns your V8 engine into a V4 which saves fuel. AFMlifters have a history of failing and oil consumption can be a problem. 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs. Only thing I noticed with the oil consumption issue. NOT GOOD!! Cylinder Deactivation to the Rescue. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. Please report back if you have any issues, but I think you are in good shape. Hopefully more is known by then. they are known to become plugged. Hi Brian, Im curious as to how much tran fluid you put in? They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. It depends on the failure mode of the lifter however, certainly worth a try. No it runs fine on sylinder one but not on 6 or 7!!! You cannot compare them to old 350s. whith a disabler. It uses a M14 x 1.5 thread plug like Dorman 65217. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. 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. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). I would appreciate any feedback. 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. 2 15 with 5.3 Sierras both with 100k and Had nothing but trouble out of it. . Runs better than new now and no more oil consumpsion!! This is my second Avalanche and I never had any issues with either of them. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. AFMengines use special lifters for cylinders 1, 4, 6, and 7. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? 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. Pod. 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. I am confused about the plug in disabler. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. However, the fuel savings are not always as much as expected. GM claims fuel improvements ranging from 5%-15% depending on the engine. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. One must anticipate this. Now Im here tring to figure out what to do. Replacing engine due to issues caused by AFM. Had similar problems under warranty, no telling what they rigged me up with at the dealer. This really sucks. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? This is in response to pretty much everyone. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. 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. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. I have an 07 Yukon with over 180K. 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. That might show up if you cut the filter and looked for debris in the pleats. If I had wanted a 4 banger I would have bought one. New plugs and wires. Then changed the oil. Thanks for your help. Change your oil. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . In other words, the crankshaft and bearings were not visible. She had driven it for a couple of months that way. All eight cylinders are now powering the engine. Why this happens is a more . Have an intake and Borla exhaust. Yes, always change all the lifters at once. How long did it take? Ditto , never buy a throw away vehicle again is my recommendation and my fix . I just did the delete and replaced the cam as well. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. I have had some say that it is the valves and others say that it is the cats plugged. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. I ave noticed the point about excess oil spray. I have a 2011 GMC Sierra 1500 with the 5.3. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Thats not all bad because it saves the cost of an AFM delete kit. All these comments on the 5.3 are blowing my mind!!!. Ive been reading, with disgust and concern of the lifter/cam situation. Required fields are marked *. Thank you again for the response. This basically deactivates the cylinder deactivation system. 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? Ive only put a straight pipe exhaust, intake, and a boost controller on it. Really could use some pointers. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Very expensive repair too! Ketil, let us know what you find out. Can they be faulty? of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. Put everything back together proper torque, gakets, valve seals, etc. 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. 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. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Install ls3 valley cover. 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. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. The oil collapses the plunger inside the lifter. GM switched over to the 4100 v-8 in 1982. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. 190k on the motor always ran AMSOIL full synth since new. Any help would be appreciated. More information can be found in the GM TSB bulletin number 10-06-01-008g. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. This system is the most effective way to disable AFM. 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. CHANGE YOUR OIL!!!!! Will this AFM DISABLER damage anything???. Any truth to that? I noticed this discussion mainly addresses Chevy Silverados and other trucks? Love the truck so far. misfire or anything. The car runs great apart from the shuddering at those speeds. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Corvette that does employ AFM. 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. how to cancel esporta membership, bcg consultant glassdoor salary, difference between minute maid and minute maid premium,

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