I have an 07 Silverado 1500 ltz. 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 []. Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online I still get a P0336 code every once in a while but still good to drive around town. Just shut AFM off. Thanks. Dont drive it if you have a dead cylinder due to afm failure. 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. I ave noticed the point about excess oil spray. 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. Id wait until the warranty expires then disable. Thats not all bad because it saves the cost of an AFM delete kit. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? The system uses solenoids to deliver oil pressure to control. I have a 07 Yukon with 180K and no issues what so ever. No other V-8 truck of similar weight can do that (except another GM with AFM). Its not GMs choice to use AFM. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. If someone didnt want to spend gas buy a Toyota. Looking forward to input from the forum, Thank you. At this state, a disabler would probably do what you need it to do. I had to replace them all and the camshaft as well. Here's what you need to know: 1. I was getting ~ 30 mpg, so I love that. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . But it also restricts passages that the oil runs through. Mine did at the exact same time. This system was originally used in early 1980s Cadillacs. Do not pay that amount. 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. This new lawsuit is essentially identical to the previous. I am trying to prevent same issue. 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. Thats a tough call, if the warranty will cover itId let it run out. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. I speak from some experience. Would doing the disabler option once I get it back be the right one? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. If you ignore it and keep driving, odds are you will destroy the cam as well. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. I have a shop 39 yrs . Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? It was good for about 10 miles and started with same loud knock noise. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? I own a reputable repair shop. Only thing I noticed with the oil consumption issue. 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. 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. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. The biggest problem is nobody changes their oil on time. Very expensive repair too! All ready done valve job . Our 2013 yukon with 47k miles just failed. Where can I buy a bolt to replace this relief valve ?? Chris, when you did your delete, did you also change the cam at the same time? We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. The 2016+ Tacomas are junk. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . The older truck gets 19 mpg the newer truck with fuel management gets 14. Change your oil. I have already dropped a lot of money on this truck (08 suburban). Have not had a problem yet. Most of all, my concern is reliability. The problem:. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. I have no clue what to do now. It depends on the failure mode of the lifter however, certainly worth a try. 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. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Every one of these engine will have a lifter fail, this is a travesty! Having it fixed now, just curious Seems like a problematic design. thank You so much! Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Looking to tear down myself. In other words, the crankshaft and bearings were not visible. Not sure which direction to go from here. I have been assuming this is just a slow to pump-up lifter or lifters. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Fouls those plugs. What was happening to the first is slowly (or quickly in your case) happening to the others. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). "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. 1. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. A 17 with 5.3. Sylinder one lost compression on my 09 5,3. Cylinder Deactivation & Variable Engine Displacement - LiveAbout 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 The motor I pulled was a 2007 LY5 with about 77k on it. She had driven it for a couple of months that way. Its got a hundred forty-five thousand miles on it. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 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? If you are using VVT, you could use the NAL-12612273 (L92) cam. No clue what to do. This is my project car and will be my drive (about 5000 miles a year). 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver any help? Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? If you just crack it without it starting it moves all the time . . We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Once I get it back, could I install the Disabler safely. 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. Will this AFM DISABLER damage anything???. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? 2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Chevy Silverado V8 To V4 Problems - Tools Bible [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. What type of ODBII gadget did you use? We believe this confirmed that the AFM has never been operating in this vehicle. Pulled the inntake and replaced valleypan With all the solenoids. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. I called my service station and they told me to get it in ASAP. Perhaps a flaw by design would be a more appropriate description . 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. 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??? 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? Never did strand me on the side of the road way. The detergent. Took the heads off again. 190k on the motor always ran AMSOIL full synth since new. Most will want to get rid of the AFM immediately. Thanks for your help. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. 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 []. 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. Thanks. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Is there any reaction to the disabler when pulling a boat or trailer? The exhaust valve remains open during the intake stroke and closes just before BDC. CHANGE YOUR OIL!!!!! I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Battery was unplugged for a week.. I call it active obama fuel management .A scam . I am hoping this does the trick. It has plenty of oil pressure and I put all new lifters in it. I had a 2007 Yukon XL 5.3 with the AFM. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit .IMHO . Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. 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? GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs Billy, there is some interesting trivia here on the L92. I would appreciate any feedback. NOT GOOD!! One must anticipate this. Any problems to watch out for?Did you replace the VLOM? Driver reported this occurred suddenly while driving down the highway. I recently bought a 2018 Silverado 5.3L with AFM. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. GM Lifter Recall Needed, Says Class Action Lawsuit Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. I have had some say that it is the valves and others say that it is the cats plugged. Thank you. 2 15 with 5.3 Sierras both with 100k and Last GM Ill ever buy unless its got a diesel. But the problem at that time was the computer technology. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! A tuner can often fix that as well by giving it some more ignition advance in these regions. Engine oil pressure is fine. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. 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. Welcome to socialism folks . A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. 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? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. The computers had not evolved enough to control the sytem. I know I felt the same way. There are so many more oil passages on engines these days. Carbon Build-Up in the Intake Ports.
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