My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. It came back on last Wednesday starting with a flash. Engines with AFM use a high-volume oil pump. I called my service station and they told me to get it in ASAP. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). 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. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso Everything was fine for two weeks, ow customer complains s it same noise it made as before. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. The Jury is still out on the Gen. 5s but the warranty could be an issue. I ave noticed the point about excess oil spray. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit I would just have the AFM disabled (tuned out) then. Found that all passenger side cylinders are not firing. Im always sorry to hear when people run into issues like these. Most of the complaints show up in the 2009 to 2011 model years. If the lifter actually fails so that the mechanism wont release, it wont work. Any advice that you could offer would be great. You were lucky that it worked. 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 []. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. They layed over night in engine oil before instalation. When they are locked into position, they wont wear further and cause issues down the road. It has AMF. However, the fuel savings are not always as much as expected. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. All ready done valve job . Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Verified over hundreds of trips, makes no sense. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. The exhaust valve remains open during the intake stroke and closes just before BDC. Can they be faulty? No other V-8 truck of similar weight can do that (except another GM with AFM). At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I am wondering the same thing. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Then changed the oil. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. 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. So I did the job one more time. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Below youll see references to the L99 as a result. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Keith, were happy to help. Definitely dont want to do anything to fix one problem and create another. Most will want to get rid of the AFM immediately and VVT isnt for []. 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. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? My 5.3 has a vin code of O. When you eliminate the AFM system, the extra oil is no longer needed. Or not because it is the cast iron block and not he aluminum block? 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Was a disaster then but a profitable disaster. I can literally drive from Seattle to Redding CA on one tank. 4,7 plugs foul runs rough at idle. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? 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. She had driven it for a couple of months that way. Number 7 cylinder lifters stops moving when truck starts. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. This should be added to your earlier model if you experience oil consumption. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. Hi Grant is that disabler still working for you ? Removing ignition lock cylinder when it won't turn at all Change your oil. But then she passed away from cancer. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. Would doing the disabler option once I get it back be the right one? 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. They should let us the better mileage. This new lawsuit is essentially identical to the previous. What would you do if you were in my situation? Help appreciated. I would appreciate it if you let me know how you make out. Hi Brian, But not sure very annoying. Its a CA EMMISIONS TRUCK. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. . Cylinder deactivation | GM Truck Club Forum Junk . Why this happens is a more . I have a 2013 1500 with the LC9. 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. Problems regarding Chevy 5.3L engines ticking noise and misfire. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. Cost about $250, but it is not fool proof. Thank you again for the response. 5.3-liter Chevy Engine Problems: What Should You Look Out For? GM should recall every vehicle with this terrible design flaw! Get this, rebuild is only rings and maybe lifters. has 92,000 miles and was just told I have cam and lifter failure. Everything else looked good. 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. . I recently bought a 2018 Silverado 5.3L with AFM. The engine had 200K miles. 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. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs This really sucks. PDF GM LS AFM Deactivation Lifter Issues - Melling Chevy Silverado V8 To V4 Problems - Tools Bible A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I am hoping this does the trick. 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. We were getting a code that the cam position sensor was not functioning properly. TheAFMcylinders are opposite of one another in the firing order. Then again, it should have never been controlling those solenoids. The biggest problem is nobody changes their oil on time. It prevents the computer from switching over to four-cylinder mode. The lifter seems to recharge whenever the truck sits for some time. Put everything back together proper torque, gakets, valve seals, etc. Dod is the biggest failure sence the 8-6-4 caddie in 1981. 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. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. 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. Loved the looks and interior and thought a I got a great deal at $6k even. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. The oil collapses the plunger inside the lifter. The trucks are only supposed to use two four. There are 5.3 cylinder deactivation problems that can occur. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I only had 81k on the motor. There are so many moving components in an engine these days as opposed to the past. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. If someone didnt want to spend gas buy a Toyota. what deleter (if thats a real word) have you heard good things about. 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. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. All eight cylinders are now powering the engine. All Gen IV engine blocks haveAFMtowers and oil passages cast in. I am having that done today on my 08 Suburban and its only costing me $225. What makes you think it was a design flaw ? Oil 0w or 5w -20 Brian, I have the same question as Scott. 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. Having it fixed now, just curious Seems like a problematic design. Carbon Build-Up in the Intake Ports. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . The Hit and Miss Nature of Cylinder Deactivation Systems Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. 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). Send response to tkrieg@cox.net. 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. 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. Would never take it on a long trip. Not sure what else it can be. 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. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Brian, thank you for the quick response. I drive the same 320 mile trip every two weeks and drive the same route and full tank. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. If you are using VVT, you could use the NAL-12612273 (L92) cam. Only thing I noticed with the oil consumption issue. 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? Did Obama make them do this? Regards, [], [] LS Tech: How to Delete VVT or DisableAFM []. 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. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. What the biggest reported problem with Chevy Silverados? My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. My Wifes 17 Buick with afm was my attempt to get back to gm. I was getting ~ 30 mpg, so I love that. Corvette that does employ AFM. 50,000 miles. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Some guys have been able to use a tool through the top with the cover off to get it to release. 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. Easier said than done. 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. Thank you. Lost number four Do you think I can still disable AFM? 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. Truck has an active P0300 code and runs very rough. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo I cant really tell from driving. Pushing forward. On the AFM lifters that dosnt work i have installed them With the oil hole Down! , Production date on the vehicle is 04/2006 oddly enough. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). Took it to a shop and they advised that it could be due to the AFM system not functioning properly. It works . If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. 1981 Cadillac V 864. Why does GM's cylinder deactivation cause lifter failure? I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Does cylinder deactivation affect engine life? - Quora She started to have the lifter problem again after 60,000 miles more. in your opinion will this work, i really dont see any reason it wouldnt. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. With 40000 Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. Disable the afm. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver Would installing the Disabler solve this? After reading these forums Im a little concerned about my decision to stay with GM. Just one or two. But if you dont like it. Chevrolet Silverado 2014-Present: Common Problems Toyota has their own problems. A tuner can often fix that as well by giving it some more ignition advance in these regions. New plugs and wires. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Drives way better for my mostly paved road driving. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. There is a chance the cam lobe was stressed and started to deteriorate. I ran 0W-20 no more the 5000 miles between changes. Replace the cam or do the delete kit? Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Theyre also notorious for bad cam tower oil leaks. 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. GM Lifter Recall Needed, Says Class Action Lawsuit They dont so any better than domestics on mpgs. Can you tell me what needs to be done with the VVT? Covers me to 100K. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. If buying a tuner/chip which works best for that truck/engine? Im curious as to how much tran fluid you put in? I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode.
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