gm cylinder deactivation problems

Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. Is this due to the AFM being shut off? I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in Brian, I have been reading your article about the AFM. I have the towing package on my 13 Tahoe LTZ. If you just crack it without it starting it moves all the time . Drives way better for my mostly paved road driving. Seafoam with syn oil change only fixed for a week. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Yes thats true. 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). I have a 12 with 4.8 Silverado 75000 miles You could also have tried that if the trans oil didnt work. Corvette that does employ AFM. 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. The biggest problem is nobody changes their oil on time. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. has 92,000 miles and was just told I have cam and lifter failure. I am wondering the same thing. Everything else looked good. He used seafoam and changed to synthetic oil. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. One must anticipate this. Have a lifter problem on my 2010 5.3 Silverado. 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. RANGE TECNOLOGY.COM. The Jury is still out on the Gen. 5s but the warranty could be an issue. If the lifter actually fails so that the mechanism wont release, it wont work. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. There are so many more oil passages on engines these days. 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). 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. I had privilege to work on some of that garbage they never did work . 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. This lowers the cost of building it [], [] aluminum block engine. GM should recall every vehicle with this terrible design flaw! Thank you. I havent has any lifter or cam issues. 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. Getting ready to diy for $450. Any advice that you could offer would be great. But after reading this thread, Im a little concerned about the long-term reliability. Their tech guys have seen it all and may have some thoughts on this as well. It is currently at the dealer having a new long block installed under warranty. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Please report back if you have any issues, but I think you are in good shape. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. The detergent. There is a good chance that some of the drivers side lifters decided to go. 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 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. Where can I buy a bolt to replace this relief valve ?? [], [] 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. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. The 2nd went with a conventional valvetrain. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. The motor I pulled was a 2007 LY5 with about 77k on it. How about if they just let us have a manual transmission agains for fuel mileage? My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Its ribbed with solenoids on the underside. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! Most of the complaints show up in the 2009 to 2011 model years. 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. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. Basically rebuilt most of the engine while in the vehicle. is it still working good since you have done that with the trans fluid? I have a 07 Yukon with 180K and no issues what so ever. Definitely dont want to do anything to fix one problem and create another. GM get a clue! I want to put a AFM disabler in it what all do I need to have done. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Better airflow reduces drag on the pistons and the associated pumping losses. Your email address will not be published. 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? This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. 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 write up confuses me. It replaces the AFM components with standard parts. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. More information can be found in the GM TSB bulletin number 10-06-01-008g. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). If you left the original cam in, the AFM cylinders will be down about 25 lbs. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. With 44, its a enormous Jon to remove the oil pan. NOT GOOD!! Its Chrysler and Ford. Any guidance would surely be appreciated. any help? Clean oil is crucial. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. She had driven it for a couple of months that way. Very confusing stuff out there. Im always sorry to hear when people run into issues like these. How did your turn out? Most will want to get rid of the AFM immediately. Ive been reading, with disgust and concern of the lifter/cam situation. This is what I keep telling people. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. 2 15 with 5.3 Sierras both with 100k and My question on a 2007 Chevy Tahoe 5.3 AFM https://www.cargurus.com/Cars/Discussion-t30884_ds822284. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Its a CA EMMISIONS TRUCK. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. A tuner can often fix that as well by giving it some more ignition advance in these regions. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. You will get codes thrown if the afm is physically removed without telling the ECM you did so. 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. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. It only has about 9k miles on it. I am hoping this does the trick. Once the lifter has been damaged, the cam is probably also damaged. All eight cylinders are now powering the engine. Engines with AFM use a high-volume oil pump. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. This is my project car and will be my drive (about 5000 miles a year). The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Here's what you need to know: 1. On one hand it has an aluminum block, which is nice. 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. I have a 2012 Chevy Avalanche. Does the disabler prevent the engine damage in the first place? I asume low oil pressure cant make some of the DOD lifters to malfunction? All Gen IV engine blocks haveAFMtowers and oil passages cast in. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). 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? Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. 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. Hi Mike, the metal shield you noticed is probably the windage tray. 1. Would it be fine to go ahead with the AFM Disabler? I had to replace them all and the camshaft as well. But then she passed away from cancer. I have a 2014 Silverado with a 5-3. 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. Hopefully he can free up the stuck/collapsed lifter. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? You were lucky that it worked. Now Im here tring to figure out what to do. Fouls those plugs. Nine plaintiffs filed the General . AFM - active fuel management strategy which deactivates the lifters on specific . Is there any potential down-side to doing this in other words, might this do more harm than good? The most common issue GM vehicle owners with AFM report is increased fuel consumption. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I call it active obama fuel management .A scam . 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. This new lawsuit is essentially identical to the previous. 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. Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? 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. Have misfire code and engine has what I would call a surge while driving. im going to plug in a dissabler when im done to keep it V8 mode all the time. However, they are only functional on engines that usedAFM. Im praying that my RangeTech buys me a few years. They should let us the better mileage. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Only thing I noticed with the oil consumption issue. I am leaning heavily on installing the AFM disabler. Found that all passenger side cylinders are not firing. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. [], [] LS Tech: How to Delete VVT or DisableAFM []. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Bought an 07 GMC Yukon 5.3 with the AFM, 87k. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. No clue what to do. 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. This allows the engine to run in V8 mode. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Im confused from the write up about the plug in. Once I get it back, could I install the Disabler safely. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. What was happening to the first is slowly (or quickly in your case) happening to the others. Covers me to 100K. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Love the truck. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Brian, thank you for the quick response. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. The collapsed lifters will not engage the pushrods and both valves remain closed. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. The dealer in Rockhill, SC when asked only said they had not had a problem. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. There has been a lifter noise since I bought the truck 1 year ago. It has AMF. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. Engine oil pressure is fine. It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Didnt change exhaust nor tune so likely no change in power/torque. 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. When you eliminate the AFM system, the extra oil is no longer needed. 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. Truck ran fine before that. You cannot compare them to old 350s. 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. Mine did at the exact same time. 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. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Run it and let it soak overnight. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. No movement on the rocker arms. Put everything back together proper torque, gakets, valve seals, etc. The 2016+ Tacomas are junk. The oil is baked on to every component. Perhaps a flaw by design would be a more appropriate description . I couldnt agree with you less, yet I respect your opinions. GM claims fuel improvements ranging from 5%-15% depending on the engine. One the other hand, it came without AFM, VVT, or flex fuel capability. I had a 2007 Yukon XL 5.3 with the AFM. Any problems to watch out for?Did you replace the VLOM? 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. Then I guess I have to spend a bunch of money and get the delete kit. 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 []. Changing the sensor didnt help. Ditto , never buy a throw away vehicle again is my recommendation and my fix . 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. It uses a M14 x 1.5 thread plug like Dorman 65217. 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 []. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Brian, I have the same question as Scott. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. In other words, the crankshaft and bearings were not visible. Pushing forward. It seems this tough engine has everything incorporated into it. 1. Its not possible to install them wrong? AFMlifters have a history of failing and oil consumption can be a problem. You are correct. will feel like a jerk asking the clerk at lowes to cut them again.

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