gm cylinder deactivation problems

No it runs fine on sylinder one but not on 6 or 7!!! It is usually first noticed during highway driving. This is my second Avalanche and I never had any issues with either of them. (Non-AFM engines have a smooth cover.). We need availability of a replacement engine without the AFM. This is my project car and will be my drive (about 5000 miles a year). Accept i only have 60K on my truck and it hasnt recovered. 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. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. 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. 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. Hi Brian, I am wondering the same thing. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? It was well researched and tested back in the late seventies and eighties . Im always sorry to hear when people run into issues like these. I want to put a AFM disabler in it what all do I need to have done. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). If under the truck while parked and it is doing it it sounds like it is towards the back of motor. All Gen IV engine blocks haveAFMtowers and oil passages cast in. 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). A lot of drivers reported losing 2-4 quarts of oil in between oil changes. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? But after reading this thread, Im a little concerned about the long-term reliability. In other words, the crankshaft and bearings were not visible. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). This happened on a camping trip with my kids last friday night. changed oil , its all working now, but want to disable this sorry system. Number 7 cylinder lifters stops moving when truck starts. Having it fixed now, just curious Seems like a problematic design. Was a disaster then but a profitable disaster. The engine also had 799 or 243 casting heads which are closely related to the LS6. I can literally drive from Seattle to Redding CA on one tank. With the nipple, or without? Its a CA EMMISIONS TRUCK. Thanks for the advice Brian! I also notice that it doesnt go into V4 when it is cold. Now you tell me AFM works and I will tell you; that you are full of shit! Any thoughts or suggestions would be appreciated. Did Obama make them do this? 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. I still get a P0336 code every once in a while but still good to drive around town. It will show up as a misfire code in a cylinders 1,4,6, or 7. One the other hand, it came without AFM, VVT, or flex fuel capability. Its ribbed with solenoids on the underside. Have not had a problem yet. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. Still have no power. 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 main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . has 92,000 miles and was just told I have cam and lifter failure. They took the engine down today found so much damage inside they ordered a new engine from Detroit. What type of disabler did you go with? 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. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. 1. thank You so much! Solenoids, new lifters also test voltage to solenoid pack all good their, Since no air can get in or out, four cylinders provide no power. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. So I did the job one more time. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Brian, thank you for the quick response. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. It only has about 9k miles on it. What type of ODBII gadget did you use? A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. in your opinion will this work, i really dont see any reason it wouldnt. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. Thank you again for the response. Because I want to. I have no clue what to do now. No problems with any to this point. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. 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. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. 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. 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. Pushing forward. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. Just pulled it down in the garage there was no other damage , luckily. They dont so any better than domestics on mpgs. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. All the time. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. It essentially turns your V8 engine into a V4 which saves fuel. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Is this due to the AFM being shut off? I just got new warranty engine and dont want this issue again? Have misfire code and engine has what I would call a surge while driving. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. How do you know if the lifter has failed? My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. 330-630-0240. I dont plan on installing the delete kit at this time. Can they be faulty? You will get codes thrown if the afm is physically removed without telling the ECM you did so. This is what I keep telling people. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Would never take it on a long trip. , Production date on the vehicle is 04/2006 oddly enough. There may be an ignition related issue on that cylinder. Call chevy.They should being paying most of that. I was getting ~ 30 mpg, so I love that. As you said, the ECM was never seeing the AFM so I think youre good to go. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. My daughters car had about 230,000 miles when she complained of the problem. .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 bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. I have a 07 Yukon with 180K and no issues what so ever. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a 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. Then changed the oil. Looking forward to input from the forum, Thank you. I am trying to find out of this is true. No movement on the rocker arms. lol. I will keep reading and take notes. This allows the engine to run in V8 mode. Diablo says yes but they do not provide tunes. Thanks for your help. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Pulled the inntake and replaced valleypan With all the solenoids. This really sucks. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps. Regarding the cylinder deactivation impact on fuel consumption . 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. However, they are only functional on engines that usedAFM. You cannot compare them to old 350s. I would appreciate it if you let me know how you make out. Any truth to that? Hello. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? How did your turn out? I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. 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. 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. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. so the trans fluid worked for you then? They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Your email address will not be published. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. The car runs great apart from the shuddering at those speeds. Thanks. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Are you saying that I am in the clear by a year and issues fixed? This system was originally used in early 1980s Cadillacs. Brian, I have been reading your article about the AFM. 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? Everything else looked good. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Im confused from the write up about the plug in. The biggest problem is nobody changes their oil on time. I am leaning heavily on installing the AFM disabler. But if you dont like it. 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 depends on the failure mode of the lifter however, certainly worth a try. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. I have a 2013 1500 with the LC9. Ayush Srivastava https://www.cargurus.com/Cars/Discussion-t30884_ds822284. How about if they just let us have a manual transmission agains for fuel mileage? Then it takes out the lifter again and again until you bite the bullet and replace the cam. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . 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. More information can be found in the GM TSB bulletin number 10-06-01-008g. 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. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. Had similar problems under warranty, no telling what they rigged me up with at the dealer. IMHO . I couldnt agree with you less, yet I respect your opinions. 50,000 miles. 2 15 with 5.3 Sierras both with 100k and I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. 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. 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. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. 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? 190k on the motor always ran AMSOIL full synth since new. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. With 40000 Thats a tough call, if the warranty will cover itId let it run out. []. Easier said than done. GM should recall every vehicle with this terrible design flaw! Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. It has plenty of oil pressure and I put all new lifters in it. 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? hi brian when you replace the lifters do you have to change the guides also? thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. When you drain the oil at three to four thousand miles its still clean. misfire or anything. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I had to replace them all and the camshaft as well. I already ordered the parts to replace myself and remove the code. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I have an 07 Yukon with over 180K. please respond with your opinion. is it still working good since you have done that with the trans fluid? You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. I wont bother with blocking the relief valve. RANGE TECNOLOGY.COM. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Most of all, my concern is reliability. []. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Can I (should I) also change to a standard volume oil pump? 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. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. The Jury is still out on the Gen. 5s but the warranty could be an issue. 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. 1981 Cadillac V 864. Really could use some pointers. . 4,7 plugs foul runs rough at idle. Hopefully more is known by then. . Took it to my dads and he tore things apart and found that I had a lifter that was stuck. 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. I have a shop 39 yrs . I am considering the same. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. 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. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Thankfull for any ideeas! So for all of you that continue to complain about how bad these things are. Replaced all lifters on passenger side as well as pushrods for even wear. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Changing the sensor didnt help. There has been a lifter noise since I bought the truck 1 year ago. Replacing engine due to issues caused by AFM. 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? Ill Never Ever buy another gm. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. 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. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . stalled in a certain way a warning wouldn be a bad idea. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Please report back if you have any issues, but I think you are in good shape. Take a look at what bmw did in its R1250 bike. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. 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 . We chickened out though and just bolted the AFM solenoid plate onto the used engine. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. One must anticipate this. I have a Yukon 116k it now needs its 3rd set of lifters and cam. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. 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?? Mine did at the exact same time. Send response to tkrieg@cox.net. They lasted one year with big problems. Their tech guys have seen it all and may have some thoughts on this as well. the body is in great shape. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! That inherently less smooth operation requires additional NVH dampening. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Oil 0w or 5w -20 It has has 9000 miles and no lifter or other issues or codes so far. 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. Thanks for the detailed post! AFMengines use special lifters for cylinders 1, 4, 6, and 7. Unfortunately, I found out about the lifters too late. GM uses 3 different styles all are engine specific. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. 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. Then I guess I have to spend a bunch of money and get the delete kit. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . I have a noise in the engine but it seems to go away when revved up. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Love the truck so far. I had a 2007 Yukon XL 5.3 with the AFM. I know a few guys with Tundras. There is a good chance that some of the drivers side lifters decided to go. [], I have a 2012 Silverado Z71 bought new.

Dog Poking Other Dog With Nose, Delegation Role Play Scenarios, Who's Been Sentenced Kettering, Ketu In Gemini Ascendant, Articles G