Fouls those plugs. Do you think I can still disable AFM? Now I get 24 to 26 with deactivation locked out and full power. What was happening to the first is slowly (or quickly in your case) happening to the others. [] 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. Hopefully he can free up the stuck/collapsed lifter. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. If I put my truck in manual 5, it doesnt try to go into V4 mode. 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. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. AFM Sucks!!! Can you tell me what needs to be done with the VVT? I will keep reading and take notes. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. Learn how your comment data is processed. They should let us the better mileage. 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? Hello. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Cost about $250, but it is not fool proof. I did noticed the oil consumption but it was rare that I would have to add oil. Constant engine and transmission problems. Clean oil is crucial. 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. Some guys have been able to use a tool through the top with the cover off to get it to release. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. 1981 Cadillac V 864. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Have a lifter problem on my 2010 5.3 Silverado. 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. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Unfortunately, I found out about the lifters too late. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. This really sucks. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 2 15 with 5.3 Sierras both with 100k and Regarding the cylinder deactivation impact on fuel consumption . I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Glad I did. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. The oil collapses the plunger inside the lifter. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Yes, always change all the lifters at once. 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. Not sure what else it can be. Lost number four Replaced all 16 lifters due to collapsed lifter on CYl #4. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. I guess I might have to call a dealership or GM to get a definite answer on this one. This system is the most effective way to disable AFM. 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 dont plan on installing the delete kit at this time. 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. 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?? Did gm make a non-dod version of the 5.3 with iron block that would work in my application? When you don't need the full power of the engine, it provides better fuel economy." . im going to plug in a dissabler when im done to keep it V8 mode all the time. One the other hand, it came without AFM, VVT, or flex fuel capability. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. Only thing I noticed with the oil consumption issue. Who knew? It was well researched and tested back in the late seventies and eighties . 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? 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. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. Ayush Srivastava 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". If you installed a performance cam intended for a car, it may be bleeding off some low end compression. She had driven it for a couple of months that way. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Todays computers are faster so it does work. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. Then had to drive the truck back to Tampa from Cheifland Fl. They dont so any better than domestics on mpgs. It uses a M14 x 1.5 thread plug like Dorman 65217. I have been assuming this is just a slow to pump-up lifter or lifters. 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? If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? The lifter seems to recharge whenever the truck sits for some time. CHANGE YOUR OIL!!!!! Removing ignition lock cylinder when it won't turn at all The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. You could also have tried that if the trans oil didnt work. I have an 07 Yukon with 230k on the engine. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Thats a tough call, if the warranty will cover itId let it run out. 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. 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. It has has 9000 miles and no lifter or other issues or codes so far. This lowers the cost of building it [], [] aluminum block engine. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Does the disabler prevent the engine damage in the first place? Most will want to get rid of the AFM immediately and VVT isnt for []. It prevents the computer from switching over to four-cylinder mode. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? These trucks cost too much to have a terrible product. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. There are 5.3 cylinder deactivation problems that can occur. [], [] LS Tech: How to Delete VVT or DisableAFM []. New plugs and wires. Brian, thank you for the quick response. No other V-8 truck of similar weight can do that (except another GM with AFM). But if you dont like it. Thank you for your time. All Cylinders. 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 . hi brian when you replace the lifters do you have to change the guides also? No clue what to do. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority I just got new warranty engine and dont want this issue again? Some drivers want V8 power under their foot at all times. Never did strand me on the side of the road way. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. Most of all, my concern is reliability. I quites down to nothing after running for about a minute. Remembered that after I bought my Tahoe. I also notice that it doesnt go into V4 when it is cold. Had similar problems under warranty, no telling what they rigged me up with at the dealer. I am confused about the plug in disabler. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. You were lucky that it worked. Are you saying that I am in the clear by a year and issues fixed? The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit A 17 with 5.3. We need availability of a replacement engine without the AFM. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. Looking forward to input from the forum, Thank you. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. But then she passed away from cancer. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. 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. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. lol. Its a CA EMMISIONS TRUCK. Send response to tkrieg@cox.net. I am considering the same. I may just do that Vic. 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. I just took a long trip and it used 1.5 quarts of oil. I have a 2014 Silverado with a 5-3. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? The engine also had 799 or 243 casting heads which are closely related to the LS6. Last GM Ill ever buy unless its got a diesel. Found that all passenger side cylinders are not firing. In other words, the crankshaft and bearings were not visible. I tried the trans fluid in the oil. Pulled the inntake and replaced valleypan With all the solenoids. The biggest problem is nobody changes their oil on time. I still get a P0336 code every once in a while but still good to drive around town. Thanks. Shame this happened. 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? TheAFMcylinders are opposite of one another in the firing order. It works . 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. is it still working good since you have done that with the trans fluid? Is there any reaction to the disabler when pulling a boat or trailer? My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. I went with the new motor for the warranty. Ill Never Ever buy another gm. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo Would doing the disabler option once I get it back be the right one? 4,7 plugs foul runs rough at idle. It replaces the AFM components with standard parts. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Or not because it is the cast iron block and not he aluminum block? I have a 2012 Chevy Avalanche. I have an 07 Silverado 1500 ltz. Run it and let it soak overnight. My fear now is not will it happen but when! You also need the disabler installed in your obd connector. A 14 gmc 5.3 Sierra 85000 miles I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). Having a hard time finding one .. I would just have the AFM disabled (tuned out) then. 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. There is a chance the cam lobe was stressed and started to deteriorate. [] 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 []. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 2011 Chevy Avalanche LTZ. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. It also has an electrical connector on the back. 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! My 2002 I had over 298K on it with no engine related issues. 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. Call chevy.They should being paying most of that. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Yeh truck has 5237 miles on it Definitely dont want to do anything to fix one problem and create another. Just recently, GM announced a temporary closure. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . I have already dropped a lot of money on this truck (08 suburban). That inherently less smooth operation requires additional NVH dampening. 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. 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. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? Teflon coatings does not last. Its ribbed with solenoids on the underside. I just bought a 2018 Silverado. I have a noise in the engine but it seems to go away when revved up. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. You will get codes thrown if the afm is physically removed without telling the ECM you did so. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. The dealer in Rockhill, SC when asked only said they had not had a problem. The exhaust valve remains open during the intake stroke and closes just before BDC. I told her to never pull the gadget out. 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. It has the orings in place, that seals the towers. Hi Grant is that disabler still working for you ? I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. . If I had wanted a 4 banger I would have bought one. Cylinder Deactivation to the Rescue. 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. Corvette that does employ AFM. 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. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. You cannot compare them to old 350s. I would appreciate it if you let me know how you make out. Fortunately, the old engine hadnt been shipped back to the remanufacturer. The collapsed lifters will not engage the pushrods and both valves remain closed. Change your oil. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test.
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