gm cylinder deactivation problems

Since no air can get in or out, four cylinders provide no power. 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. I still get a P0336 code every once in a while but still good to drive around town. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? I have a 12 with 4.8 Silverado 75000 miles Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. All eight cylinders are now powering the engine. Todays computers are faster so it does work. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Yeh truck has 5237 miles on it It has 8,000 miles on it. 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. I would rather stay a V8 full time than deal with AFM issues in the future. 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. Have there been improvements in more recent model years employing AFM [2014 or newer]? Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. I am leaning heavily on installing the AFM disabler. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. That might show up if you cut the filter and looked for debris in the pleats. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. . I only had 81k on the motor. Id wait until the warranty expires then disable. 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. 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 ! Pulled right valve cover an rockers on syl 6 dont move. Its got a hundred forty-five thousand miles on it. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. How do you know if the lifter has failed? I got the AMF disabler anyway and so far so good. Your email address will not be published. Oil 0w or 5w -20 the extra oil isnt needed. Engine starts but is throwing a misfire on cyls 4,7. Ketil, let us know what you find out. It is currently at the dealer having a new long block installed under warranty. I have an 07 Yukon with over 180K. Most of the complaints show up in the 2009 to 2011 model years. This is my project car and will be my drive (about 5000 miles a year). Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. But then she passed away from cancer. 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. . What was happening to the first is slowly (or quickly in your case) happening to the others. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Dod is the biggest failure sence the 8-6-4 caddie in 1981. 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. 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?? To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. There are no changes in the valves or the springs. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. 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. 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. Fortunately I received a reducing in house shop hourly rate. 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. 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 . I went with the new motor for the warranty. Number 7 cylinder lifters stops moving when truck starts. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. I had privilege to work on some of that garbage they never did work . Thank you for your time. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Call chevy.They should being paying most of that. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). It has AMF. 4,7 plugs foul runs rough at idle. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Should I buy one to disable the V4 mode? 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. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. 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. Ill Never Ever buy another gm. I plan on getting a tuner to disable the AFM. Carbon Build-Up in the Intake Ports. Ive been reading, with disgust and concern of the lifter/cam situation. 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. Have not had a problem yet. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 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? We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. 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 did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? 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. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. I have a noise in the engine but it seems to go away when revved up. If I had wanted a 4 banger I would have bought one. Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? [] 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. It depends on the failure mode of the lifter however, certainly worth a try. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? I ran 0W-20 on more the 5000 miles between changes. It was well researched and tested back in the late seventies and eighties . I already ordered the parts to replace myself and remove the code. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. 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. [] they have a downside? A tuner can often fix that as well by giving it some more ignition advance in these regions. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Another option is to plug it entirely if the AFM is already removed. Have an intake and Borla exhaust. Would you get enough power to drive at freeway speeds? I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. Having a hard time finding one .. I know I felt the same way. From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Driver reported this occurred suddenly while driving down the highway. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. 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?

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gm cylinder deactivation problems

gm cylinder deactivation problems