2 15 with 5.3 Sierras both with 100k and Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. You may want to update your post. another common cause for low OP is the oil pick up tube O ring. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Pod. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. 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? Very confusing stuff out there. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. It is being covered under warranty since I only have 72,000 miles on it. If I had wanted a 4 banger I would have bought one. CHANGE YOUR OIL!!!!! How long did it take? . Shame this happened. lol. The engine had 200K miles. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Looking forward to input from the forum, Thank you. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Mine did at the exact same time. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! I guess I might have to call a dealership or GM to get a definite answer on this one. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. 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. This system is the most effective way to disable AFM. Getting ready to diy for $450. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. It is currently at the dealer having a new long block installed under warranty. stalled in a certain way a warning wouldn be a bad idea. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Brian, thank you for the quick response. Can they be faulty? After all we bailed them out of bankruptcy. Dont drive it if you have a dead cylinder due to afm failure. Do not pay that amount. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. I just got new warranty engine and dont want this issue again? 2 15 with 5.3 Sierras both with 100k and There is a good chance that some of the drivers side lifters decided to go. Now you tell me AFM works and I will tell you; that you are full of shit! Thats a tough call, if the warranty will cover itId let it run out. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. The engine has flex-fuel capability. I love the car so far. The older truck gets 19 mpg the newer truck with fuel management gets 14. Ayush Srivastava Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy 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. If you left the original cam in, the AFM cylinders will be down about 25 lbs. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. 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? . I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. please respond with your opinion. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. 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 []. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. Should I buy one to disable the V4 mode? If you installed a performance cam intended for a car, it may be bleeding off some low end compression. The LZ1 was upgraded with AFM and []. 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. 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. Hi. My 5.3 is. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I have a 12 with 4.8 Silverado 75000 miles 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. If I put my truck in manual 5, it doesnt try to go into V4 mode. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. Next day, fired it up to take the the junk yard and it ran great. I went with the new motor for the warranty. Remembered that after I bought my Tahoe. 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. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. I would. Looking to tear down myself. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. 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. You will get codes thrown if the afm is physically removed without telling the ECM you did so. If I put the Range module on, is that all I need to do, both now and long term? Wed recommend a call to our partners at Summit Racing. 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. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. 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? 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. 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. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. The oil is baked on to every component. Easier said than done. I know a few guys with Tundras. 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. I have a 12 wit 4.8 Silverado 75000 miles The exhaust valve remains open during the intake stroke and closes just before BDC. Can I (should I) also change to a standard volume oil pump? In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. They dont so any better than domestics on mpgs. This really sucks. Covers me to 100K. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Did not help. Told her that it would not last and that she needed to find a different way to get around. The result is improved combustion chamber pressure as the piston approaches top . This happened on a camping trip with my kids last friday night. Just shut AFM off. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? Glad I did. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Have a lifter problem on my 2010 5.3 Silverado. they are known to become plugged. has 92,000 miles and was just told I have cam and lifter failure. Accept i only have 60K on my truck and it hasnt recovered. I have a shop 39 yrs . Yes a poor design but a flaw ? If you ignore it and keep driving, odds are you will destroy the cam as well. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Not sure what else it can be. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Yeh truck has 5237 miles on it An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Is there any potential down-side to doing this in other words, might this do more harm than good? Help appreciated. Fouls those plugs. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. Because its not just GM that have engine problems. Brian, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Engine oil pressure is fine. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. 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. I am confused about the plug in disabler. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. With the nipple, or without? Once I get it back, could I install the Disabler safely. 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! Dont want to make a move on a new truck or jump to a 2500 yet. Do you think I can still disable AFM? Any help would be appreciated. The car runs great apart from the shuddering at those speeds. 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. 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. The collapsed lifters will not engage the pushrods and both valves remain closed. It depends on the failure mode of the lifter however, certainly worth a try. 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. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? So I researched and got an AFM disabler. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Any problems to watch out for?Did you replace the VLOM? Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Toyota has their own problems. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. We believe this confirmed that the AFM has never been operating in this vehicle. They may be able to find some of those missing ponies. I loved this rtuck until this happened!! The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Change your oil. 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. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. 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". One alternative is to swap in one of the larger 6.0 non-AFM truck cams. It has plenty of oil pressure and I put all new lifters in it. Runs better than new now and no more oil consumpsion!! Really could use some pointers. I have been assuming this is just a slow to pump-up lifter or lifters. It is replaceable.. just remove oil pan and it will be on top at the filter. Would you get enough power to drive at freeway speeds? Replaced all lifters. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? I have read synthetic isnt good for AFM lifters. Thanks. I hate it. Required fields are marked *. I am wondering the same thing. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). What would you do if you were in my situation? A 14 gmc 5.3 Sierra 85000 miles When you drain the oil at three to four thousand miles its still clean. There are no changes in the valves or the springs. AFMengines use special lifters for cylinders 1, 4, 6, and 7. Where can I buy a bolt to replace this relief valve ?? 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. Keith, were happy to help. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt.
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