[] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. I have a 2012 Chevy Avalanche. I recently took a long trip and it burned 1.5 quarts of oil. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. in your opinion will this work, i really dont see any reason it wouldnt. 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? The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. The exhaust valve remains open during the intake stroke and closes just before BDC. Thank you. If buying a tuner/chip which works best for that truck/engine? I did noticed the oil consumption but it was rare that I would have to add oil. GM Dynamic Fuel Management Cylinder Deactivation Technology - GM Authority Its ribbed with solenoids on the underside. 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. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? The Jury is still out on the Gen. 5s but the warranty could be an issue. Ditto , never buy a throw away vehicle again is my recommendation and my fix . I am considering the same. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. 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? GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? He unstuck it and I took it for a drive and same thing happened. Yes a poor design but a flaw ? Drives way better for my mostly paved road driving. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. 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 []. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Glad I did. GM Lifter Recall Needed, Says Class Action Lawsuit If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. 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. It came back on last Wednesday starting with a flash. Brian, 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. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. 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. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? No other V-8 truck of similar weight can do that (except another GM with AFM). Any truth to that? WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Traded it with 180K miles and did not experience any problems. Learn how your comment data is processed. Keith, were happy to help. You may want to update your post. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. Dod is the biggest failure sence the 8-6-4 caddie in 1981. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. im going to plug in a dissabler when im done to keep it V8 mode all the time. 330-630-0240. 2 15 with 5.3 Sierras both with 100k and The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM It replaces the AFM components with standard parts. 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. Clean oil is crucial. The dealer in Rockhill, SC when asked only said they had not had a problem. Once the lifter has been damaged, the cam is probably also damaged. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Driver reported this occurred suddenly while driving down the highway. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. After all we bailed them out of bankruptcy. 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. 1. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Toyota will be my next truck unless GM owns up and makes wright with consumers. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. But the problem at that time was the computer technology. I wont bother with blocking the relief valve. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? Sylinder one lost compression on my 09 5,3. Yes thats true. Constant engine and transmission problems. I have 217,000+ on it and it never fails meever! Did not help. I would just have the AFM disabled (tuned out) then. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. There are so many more oil passages on engines these days. Change your oil. I know a few guys with Tundras. It has has 9000 miles and no lifter or other issues or codes so far. You were lucky that it worked. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. It essentially turns your V8 engine into a V4 which saves fuel. If you ignore it and keep driving, odds are you will destroy the cam as well. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Required fields are marked *. If possible, will simply not using VVT provide a powerful,good running engine? I also notice that it doesnt go into V4 when it is cold. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. 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. [] 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 []. []. Now I get 24 to 26 with deactivation locked out and full power. Get this, rebuild is only rings and maybe lifters. 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?? But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. That inherently less smooth operation requires additional NVH dampening. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. 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. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Is this due to the AFM being shut off? Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Welcome to socialism folks . New plugs and wires. Is there any potential down-side to doing this in other words, might this do more harm than good? $8500.00 fix. Replacing engine due to issues caused by AFM. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. A 17 with 5.3. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. The 2016+ Tacomas are junk. [], [] LS Tech: How to Delete VVT or DisableAFM []. Billy, there is some interesting trivia here on the L92. Replaced all lifters on passenger side as well as pushrods for even wear. The oil collapses the plunger inside the lifter. There are so many moving components in an engine these days as opposed to the past. Theyre also notorious for bad cam tower oil leaks. Here's what you need to know: 1. 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 []. It prevents the computer from switching over to four-cylinder mode. Its not GMs choice to use AFM. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. How long did it take? Does cylinder deactivation affect engine life? - Quora I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Its not possible to install them wrong? Have not had a problem yet. Pulled right valve cover an rockers on syl 6 dont move. 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. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. 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. 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. Any advice that you could offer would be great. Easier said than done. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. I tried the trans fluid in the oil. Problems regarding Chevy 5.3L engines ticking noise and misfire. The collapsed lifters will not engage the pushrods and both valves remain closed. At this state, a disabler would probably do what you need it to do. The motor I pulled was a 2007 LY5 with about 77k on it. The system uses solenoids to deliver oil pressure to control. Cost about $250, but it is not fool proof. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Brian, thank you for the quick response. Any guidance would surely be appreciated. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . Will this AFM DISABLER damage anything???. Yes, always change all the lifters at once. GM switched over to the 4100 v-8 in 1982. How to Delete or Disable Active Fuel Management (AFM) on GM Engines Chevrolet 5.3 Engine Issues and Recommendations 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. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. The car runs great apart from the shuddering at those speeds. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. It could be the filter screen under the oil sending unit. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. 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. 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! My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. I am having that done today on my 08 Suburban and its only costing me $225. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Covers me to 100K. 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. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Just one. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Then I guess I have to spend a bunch of money and get the delete kit. How to Fix GM's Cylinder Deactivation Problems I would say maybe 5% of my customers keep up on their oil changes. . Cylinder deactivation | GM Truck Club Forum AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Nine plaintiffs filed the General . There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. Only running on drivers side cylinders. Then again, it should have never been controlling those solenoids. 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. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? 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. Then changed the oil. Im confused from the write up about the plug in. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Thanks for the detailed post! 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.