gm cylinder deactivation problems

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. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 Sylinder one lost compression on my 09 5,3. Drives way better for my mostly paved road driving. 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. 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. GM switched over to the 4100 v-8 in 1982. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. Will this AFM DISABLER damage anything???. 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. 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. You also need the disabler installed in your obd connector. 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. 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 asume low oil pressure cant make some of the DOD lifters to malfunction? You cannot compare them to old 350s. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. I quites down to nothing after running for about a minute. One the other hand, it came without AFM, VVT, or flex fuel capability. 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. Cant believe they havent fixed this in a decade. Did Obama make them do this? stalled in a certain way a warning wouldn be a bad idea. Then again, it should have never been controlling those solenoids. Brian, thank you for the quick response. Have there been improvements in more recent model years employing AFM [2014 or newer]? Does the Pressure relief vavle ever go bad?? My question on a 2007 Chevy Tahoe 5.3 AFM 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. 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 wont bother with blocking the relief valve. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Your email address will not be published. I am considering the same. . If you are using VVT, you could use the NAL-12612273 (L92) cam. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. The detergent. 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. 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. I got the AMF disabler anyway and so far so good. Now the problems back, I have 180k miles on it now. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo Any thoughts or suggestions would be appreciated. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Any advice that you could offer would be great. The trucks are only supposed to use two four. 190k on the motor always ran AMSOIL full synth since new. But after reading this thread, Im a little concerned about the long-term reliability. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. It actavated the lifter? Would it be fine to go ahead with the AFM Disabler? This happened on a camping trip with my kids last friday night. I went with the new motor for the warranty. I would appreciate any feedback. It was good for about 10 miles and started with same loud knock noise. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 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! I had a 2007 Yukon XL 5.3 with the AFM. 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. My Wifes 17 Buick with afm was my attempt to get back to gm. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. With 40000 Have misfire code and engine has what I would call a surge while driving. Brian, Yes, always change all the lifters at once. hi brian when you replace the lifters do you have to change the guides also? Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Seafoam with syn oil change only fixed for a week. Is the Pressure relief valve replaceable? []. 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. 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? Covers me to 100K. They should let us the better mileage. The system uses solenoids to deliver oil pressure to control. 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. It came back on last Wednesday starting with a flash. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? I have been assuming this is just a slow to pump-up lifter or lifters. Last GM Ill ever buy unless its got a diesel. 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). Getting ready to diy for $450. I know I felt the same way. 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? Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Engines with AFM use a high-volume oil pump. Dod is the biggest failure sence the 8-6-4 caddie in 1981. [], [] as the LS engine familys hybrid engine in trucks and SUVs. The oil is baked on to every component. It depends on the failure mode of the lifter however, certainly worth a try. Clean oil is crucial. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. 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. I have a noise in the engine but it seems to go away when revved up. [], [] way. Im praying that my RangeTech buys me a few years. 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. Welcome to socialism folks . In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. 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. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Thanks for the advice Brian! The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Another option is to plug it entirely if the AFM is already removed. They have plastic casing, so you can imagine what will happen with aged plastic. Thanks for your help. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. A 14 gmc 5.3 Sierra 85000 miles Any guidance would surely be appreciated. Verified over hundreds of trips, makes no sense. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Do not pay that amount. []. Easier said than done. . I speak from some experience. Unfortunately, I found out about the lifters too late. The dealer in Rockhill, SC when asked only said they had not had a problem. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Just recently, GM announced a temporary closure. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM My 5.3 is. Most will want to get rid of the AFM immediately and VVT isnt for []. they are known to become plugged. Put everything back together proper torque, gakets, valve seals, etc. Glad I did. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. 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? 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 . What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? 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. I hate it. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving.

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