Regards, You could also have tried that if the trans oil didnt work. Having it fixed now, just curious Seems like a problematic design. 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. also in the pan is another AFM oil filter near the external engine oil filter. We believe this confirmed that the AFM has never been operating in this vehicle. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. please respond with your opinion. 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. They dont so any better than domestics on mpgs. Looking to tear down myself. After reading these forums Im a little concerned about my decision to stay with GM. Pod. bought at Brian Tooley Racing ! Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . It is usually first noticed during highway driving. lol. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? 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. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. 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. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Below youll see references to the L99 as a result. Driver reported this occurred suddenly while driving down the highway. I plan on getting a tuner to disable the AFM. However, they are only functional on engines that usedAFM. It prevents the computer from switching over to four-cylinder mode. Whats the next step? I hate it. Required fields are marked *. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. the extra oil isnt needed. So now at 168 thousand miles it still runs good but gets bad gass mileage. Engines with AFM use a high-volume oil pump. They should let us the better mileage. I have a 2012 Chevy Avalanche. Replace the cam or do the delete kit? Definitely dont want to do anything to fix one problem and create another. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Better airflow reduces drag on the pistons and the associated pumping losses. Have an intake and Borla exhaust. The oil is baked on to every component. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. misfire or anything. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Then again, it should have never been controlling those solenoids. I still get a P0336 code every once in a while but still good to drive around town. TheAFMcylinders are opposite of one another in the firing order. . The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? Their tech guys have seen it all and may have some thoughts on this as well. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Hello! Hi Brian, The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Will the plug in deactivater fix the oil consumption or will it cause more consumption? It essentially turns your V8 engine into a V4 which saves fuel. 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 6.2 Active Fuel Management Problems: What They Are and How - CarAraC Replaced all lifters. 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??? The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Hi Mike, the metal shield you noticed is probably the windage tray. My question is: do I install the electronic disabler on the new engine to avoid future issues? While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. The collapsed lifters will not engage the pushrods and both valves remain closed. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Hopefully he can free up the stuck/collapsed lifter. Hello. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. (Non-AFM engines have a smooth cover.). Shame this happened. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). 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. You also need the disabler installed in your obd connector. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. It also has an electrical connector on the back. 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. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. If you think GM pioneered cylinder deactivation, guess again Took the heads off again. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? There has been a lifter noise since I bought the truck 1 year ago. Dont drive it if you have a dead cylinder due to afm failure. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Chris, when you did your delete, did you also change the cam at the same time? Thanks for the advice Brian! The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. GM get a clue! [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. 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. 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. 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 for the detailed post! 2011 Chevy Avalanche LTZ. Would never take it on a long trip. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] If I put the Range module on, is that all I need to do, both now and long term? Thanks for your help. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . 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. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. I only had 81k on the motor. Had nothing but trouble out of it. How do you know if the lifter has failed? Because I want to. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? I may just do that Vic. 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. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. My Wifes 17 Buick with afm was my attempt to get back to gm. 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. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. I can literally drive from Seattle to Redding CA on one tank. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Junk . 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. Removing ignition lock cylinder when it won't turn at all Do not pay that amount. Chevrolet Silverado 2014-Present: Common Problems Corvette that does employ AFM. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Thank you. I already ordered the parts to replace myself and remove the code. Perhaps a flaw by design would be a more appropriate description . I would. When they are locked into position, they wont wear further and cause issues down the road. Last GM Ill ever buy unless its got a diesel. No clue what to do. 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 only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. Since the tranny oil worked, you should now change the oil, right? I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present.
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