Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. Since the tranny oil worked, you should now change the oil, right? Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. 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 . 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. Hello. Disable the afm. Replaced all 16 lifters due to collapsed lifter on CYl #4. Have misfire code and engine has what I would call a surge while driving. Im always sorry to hear when people run into issues like these. bought at Brian Tooley Racing ! Battery was unplugged for a week.. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. No other V-8 truck of similar weight can do that (except another GM with AFM). All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Im confused from the write up about the plug in. 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 . Changing the sensor didnt help. changed oil , its all working now, but want to disable this sorry system. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. Ayush Srivastava The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . We need availability of a replacement engine without the AFM. Toyota has their own problems. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. The 2nd went with a conventional valvetrain. This system is the most effective way to disable AFM. I have a 2011 GMC Sierra 1500 with the 5.3. One must anticipate this. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? Whats the next step? I plan on getting a tuner to disable the AFM. Any help would be appreciated. Thats not all bad because it saves the cost of an AFM delete kit. 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?? The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Perhaps a flaw by design would be a more appropriate description . Brian, thank you for the quick response. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. 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. Here's what you need to know: 1. whith a disabler. Oil flows to the special lifters through theAFMtowers. . You were lucky that it worked. 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. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? Have not had a problem yet. has 92,000 miles and was just told I have cam and lifter failure. (Bought car 1 day before lifter died!) According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Im servicing a 2011 Chevrolet 5.3 with AFM. A 14 gmc 5.3 Sierra 85000 miles Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Thanks. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I am considering the same. They have plastic casing, so you can imagine what will happen with aged plastic. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I only had 81k on the motor. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. 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. All New lifters were from AC delco. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? I got the AMF disabler anyway and so far so good. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. So I researched and got an AFM disabler. I am leaning heavily on installing the AFM disabler. It has the orings in place, that seals the towers. thank You so much! 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. Learn how your comment data is processed. This happened on a camping trip with my kids last friday night. 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. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. You may want to update your post. Is the Pressure relief valve replaceable? Ill Never Ever buy another gm. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . $8500.00 fix. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. 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 []. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. How did your turn out? I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Then again, it should have never been controlling those solenoids. Dod is the biggest failure sence the 8-6-4 caddie in 1981. Then I guess I have to spend a bunch of money and get the delete kit. No clue what to do. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. What was happening to the first is slowly (or quickly in your case) happening to the others. 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. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Engine starts but is throwing a misfire on cyls 4,7. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? Most of all, my concern is reliability. Don't even get me started on the shortened life of the cooling, starting and charging systems. Yes, always change all the lifters at once. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. 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. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. 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. the body is in great shape. She drove it for another 35,000 and it went out again. If I put my truck in manual 5, it doesnt try to go into V4 mode. It also has an electrical connector on the back. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Its ribbed with solenoids on the underside. 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. . I am hoping this does the trick. Since no air can get in or out, four cylinders provide no power. Had similar problems under warranty, no telling what they rigged me up with at the dealer. Hello! Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Cant believe they havent fixed this in a decade. 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. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . 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. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. I may just do that Vic. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. 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. Love the truck. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Should I wait until the warranty runs out, or will that be too late to stop possible damage? Help appreciated. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. I am wondering the same thing. I ran 0W-20 on more the 5000 miles between changes. Yes a poor design but a flaw ? Teflon coatings does not last. Took the heads off again. Their tech guys have seen it all and may have some thoughts on this as well. 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). I have a 12 wit 4.8 Silverado 75000 miles According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. 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? Another option is to plug it entirely if the AFM is already removed. Just recently, GM announced a temporary closure. If you left the original cam in, the AFM cylinders will be down about 25 lbs. If you just crack it without it starting it moves all the time . Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. Dont want to make a move on a new truck or jump to a 2500 yet. The exhaust valve remains open during the intake stroke and closes just before BDC. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Fortunately I received a reducing in house shop hourly rate. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. My fear now is not will it happen but when! Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Does the Pressure relief vavle ever go bad?? The 2016+ Tacomas are junk. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . [], [] way. Thank you for your time. It has AMF. Glad I did. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. 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". I recently bought a low mileage 2013 Silverado and the lifters collapsed. Why this happens is a more . Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Clean oil is crucial. In other words, the crankshaft and bearings were not visible. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. 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? I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? I had the same issue and had to have the AFM information deleted from the computer and the car tuned. 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. The LZ1 was upgraded with AFM and []. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. Looking forward to input from the forum, Thank you. Would doing the disabler option once I get it back be the right one? []. 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. I guess I might have to call a dealership or GM to get a definite answer on this one. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. Now you tell me AFM works and I will tell you; that you are full of shit! i just bought a 2018 Silverado with the 5.3 If the lifter actually fails so that the mechanism wont release, it wont work. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? GM switched over to the 4100 v-8 in 1982. I have a 2011 GMC with over 162,000 miles on it and it runs great! 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. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Didnt change exhaust nor tune so likely no change in power/torque. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. AFMlifters have a history of failing and oil consumption can be a problem. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. [] 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. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Accept i only have 60K on my truck and it hasnt recovered. Any thoughts or suggestions would be appreciated. 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. Thanks for your help. 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. . Have there been improvements in more recent model years employing AFM [2014 or newer]? I have an 07 Yukon with 230k on the engine. If I had wanted a 4 banger I would have bought one. 1. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. It prevents the computer from switching over to four-cylinder mode. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. No problems with any to this point. Why would GM ever produce such problems with such little to gain. Would it be fine to go ahead with the AFM Disabler? I have a 07 Yukon with 180K and no issues what so ever. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. I have no clue what to do now. 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 only has about 9k miles on it. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Pulled right valve cover an rockers on syl 6 dont move. Its not possible to install them wrong? the extra oil isnt needed. 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. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. 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. It could be the filter screen under the oil sending unit. 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. I have been assuming this is just a slow to pump-up lifter or lifters. GM uses 3 different styles all are engine specific. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 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. It depends on the failure mode of the lifter however, certainly worth a try. I dont know where to being to look for the problem. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Thanks for the detailed post! I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. 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. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. 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. It came back on last Wednesday starting with a flash. All ready done valve job . 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. Then changed the oil. Replaced all lifters. Have a lifter problem on my 2010 5.3 Silverado. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Looking to tear down myself. I couldnt agree with you less, yet I respect your opinions. 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? This lowers the cost of building it [], [] aluminum block engine. Cost about $250, but it is not fool proof. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009.
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