gm cylinder deactivation problems gm cylinder deactivation problems

GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. TheAFMsystem can be identified by its components. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 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 []. The valve itself is part number W0133-2574213. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Its not possible to install them wrong? My daughters car had about 230,000 miles when she complained of the problem. I just took a long trip and it used 1.5 quarts of oil. Put everything back together proper torque, gakets, valve seals, etc. It is being covered under warranty since I only have 72,000 miles on it. has 92,000 miles and was just told I have cam and lifter failure. Help appreciated. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. I have had some say that it is the valves and others say that it is the cats plugged. With 44, its a enormous Jon to remove the oil pan. Hi Brian, Wed recommend a call to our partners at Summit Racing. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. I have a shop 39 yrs . TheAFMcylinders are opposite of one another in the firing order. How do you know if the lifter has failed? 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. Im confused from the write up about the plug in. It actavated the lifter? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. .IMHO . I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? they are known to become plugged. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. the extra oil isnt needed. Runs better than new now and no more oil consumpsion!! I have a 07 Yukon with 180K and no issues what so ever. This should be added to your earlier model if you experience oil consumption. I recently bought a 2018 Silverado 5.3L with AFM. Once the lifter has been damaged, the cam is probably also damaged. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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). My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. I have an 07 Silverado 1500 ltz. The older truck gets 19 mpg the newer truck with fuel management gets 14. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Yes, always change all the lifters at once. []. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Truck has an active P0300 code and runs very rough. Thats not all bad because it saves the cost of an AFM delete kit. [], [] as the LS engine familys hybrid engine in trucks and SUVs. 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! This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. They are taller and have special oil holes. . I also notice that it doesnt go into V4 when it is cold. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Should I buy one to disable the V4 mode? Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. 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. I just bought a 2018 Silverado. 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. I went with the new motor for the warranty. 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. Its not GMs choice to use AFM. Cylinders two, three, and eight are all similar in cylinder deactivation. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. My Wifes 17 Buick with afm was my attempt to get back to gm. 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. We believe this confirmed that the AFM has never been operating in this vehicle. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Because its not just GM that have engine problems. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Mine did at the exact same time. 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. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. 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. Still have no power. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. Everything else looked good. Change your oil. Some guys have been able to use a tool through the top with the cover off to get it to release. If you left the original cam in, the AFM cylinders will be down about 25 lbs. It also has an electrical connector on the back. Whats the next step? When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. If someone didnt want to spend gas buy a Toyota. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Why would GM ever produce such problems with such little to gain. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. 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. Thank you for your time. Really could use some pointers. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. So I researched and got an AFM disabler. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. 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. It has the orings in place, that seals the towers. Is this due to the AFM being shut off? Fortunately I received a reducing in house shop hourly rate. Replaced all lifters on passenger side as well as pushrods for even wear. I can literally drive from Seattle to Redding CA on one tank. Would never take it on a long trip. I wont bother with blocking the relief valve. the body is in great shape. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Would installing the Disabler solve this? Also putting in a new transmission vs. rebuilding. Pod. I always have done my oil changes on time, not sure about the people who owned it before me though. Do you think I can still disable AFM? Diablo says yes but they do not provide tunes. thank You so much! . The result is improved combustion chamber pressure as the piston approaches top . Accept i only have 60K on my truck and it hasnt recovered. Last GM Ill ever buy unless its got a diesel. If you just crack it without it starting it moves all the time . The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? The car runs great apart from the shuddering at those speeds. Oil flows to the special lifters through theAFMtowers. Have a lifter problem on my 2010 5.3 Silverado. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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? 4,7 plugs foul runs rough at idle. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. After reading these forums Im a little concerned about my decision to stay with GM. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. (Non-AFM engines have a smooth cover.). Dod is the biggest failure sence the 8-6-4 caddie in 1981. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Open to suggestions about best course of action. How long did it take? Ketil, let us know what you find out. However, they are only functional on engines that usedAFM. I have an 07 Yukon with over 180K. But the problem at that time was the computer technology. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. GM uses 3 different styles all are engine specific. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Truck ran fine before that. I cant really tell from driving. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Since the tranny oil worked, you should now change the oil, right? I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Most of all, my concern is reliability. 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. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. 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). Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. in your opinion will this work, i really dont see any reason it wouldnt. 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. Then again, it should have never been controlling those solenoids. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? 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 []. Not sure what else it can be. AFM - active fuel management strategy which deactivates the lifters on specific . This new lawsuit is essentially identical to the previous. Send response to tkrieg@cox.net. Who knew? With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. I have a 12 wit 4.8 Silverado 75000 miles I love the car so far. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. 2 15 with 5.3 Sierras both with 100k and Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I have the towing package on my 13 Tahoe LTZ. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. 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. Should I wait until the warranty runs out, or will that be too late to stop possible damage? do you fill to capacity anyways???? If I put the Range module on, is that all I need to do, both now and long term? also in the pan is another AFM oil filter near the external engine oil filter. how many miles do you have on your engine? I have no other engine problems and Id like to fix the issue. Oil 0w or 5w -20 I had one fail and it chattered the cam to the point that I had to Install a new cam. I want to put a AFM disabler in it what all do I need to have done. so the trans fluid worked for you then? Regardless of the AFM solenoid being commanded on or off. On the AFM lifters that dosnt work i have installed them With the oil hole Down! I told her to never pull the gadget out. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? im going to plug in a dissabler when im done to keep it V8 mode all the time. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . I am hoping this does the trick. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . 1. Thanks. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . If I put my truck in manual 5, it doesnt try to go into V4 mode. Just recently, GM announced a temporary closure. It has plenty of oil pressure and I put all new lifters in 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. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. [] they have a downside? [] 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. 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. Solenoids, new lifters also test voltage to solenoid pack all good their, There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. It has 8,000 miles on it. All Cylinders. But after reading this thread, Im a little concerned about the long-term reliability. Changing the sensor didnt help. (Bought car 1 day before lifter died!) 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? Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Im always sorry to hear when people run into issues like these. Install ls3 valley cover. It has AMF. This system is the most effective way to disable AFM. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Told her that it would not last and that she needed to find a different way to get around. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. This system was originally used in early 1980s Cadillacs. 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. Some drivers want V8 power under their foot at all times. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. I still get a P0336 code every once in a while but still good to drive around town. 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. Drives way better for my mostly paved road driving. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Double digit MPGs in my 98 K1500 would be a dream lmao. I call it active obama fuel management .A scam . Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. 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. 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. [], [] LS Tech: How to Delete VVT or DisableAFM []. 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. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. I just got new warranty engine and dont want this issue again? it is the regulator guy! 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. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Fouls those plugs. Another option is to plug it entirely if the AFM is already removed. []. 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? Corvette that does employ AFM. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. It only has about 9k miles on it. I have been assuming this is just a slow to pump-up lifter or lifters. 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. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. 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. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. Then I guess I have to spend a bunch of money and get the delete kit. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. I had privilege to work on some of that garbage they never did work . Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. It uses a M14 x 1.5 thread plug like Dorman 65217. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. It is currently at the dealer having a new long block installed under warranty. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? Given that, would you recommend buying one of the OBD-II devices to disable AFM? The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption.