The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. 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! The engine is running on only four cylinders. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. It replaces the AFM components with standard parts. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. The detergent. Ketil, let us know what you find out. Fouls those plugs. I have a 12 wit 4.8 Silverado 75000 miles 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. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC Remembered that after I bought my Tahoe. The result is improved combustion chamber pressure as the piston approaches top . is it still working good since you have done that with the trans fluid? Chevy Silverado V8 To V4 Problems - Tools Bible Truck ran fine before that. The only solution is to replace the entire cylinder head. Todays computers are faster so it does work. 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. Lost number four Have there been improvements in more recent model years employing AFM [2014 or newer]? I have read synthetic isnt good for AFM lifters. You are correct. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Once the failure has occurred, the AFM shut off methods other than that probably wont work. do you fill to capacity anyways???? Some drivers want V8 power under their foot at all times. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. A 17 with 5.3. Are there errors or something only the dealer can clear? 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. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Basically rebuilt most of the engine while in the vehicle. Im crossing my fingers it does the trick! NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. All Gen IV engine blocks haveAFMtowers and oil passages cast in. You cannot compare them to old 350s. It could be the filter screen under the oil sending unit. RANGE TECNOLOGY.COM. Call chevy.They should being paying most of that. Dont want to make a move on a new truck or jump to a 2500 yet. Theyre also notorious for bad cam tower oil leaks. Toyota has their own problems. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. Any guidance would surely be appreciated. Love the truck. There are so many more oil passages on engines these days. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. Thanks. 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. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Will this AFM DISABLER damage anything???. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. 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? Please report back if you have any issues, but I think you are in good shape. The trucks are only supposed to use two four. Would it be fine to go ahead with the AFM Disabler? Pushing forward. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. Thank you. Oil flows to the special lifters through theAFMtowers. 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. 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. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Hello. Now the problems back, I have 180k miles on it now. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. I am leaning heavily on installing the AFM disabler. Thanks for your help. 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver 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. I just got new warranty engine and dont want this issue again? 2 15 with 5.3 Sierras both with 100k and Dont drive it if you have a dead cylinder due to afm failure. How to Delete or Disable Active Fuel Management (AFM) It has 8,000 miles on it. The Jury is still out on the Gen. 5s but the warranty could be an issue. Get this, rebuild is only rings and maybe lifters. Cant believe they havent fixed this in a decade. That might show up if you cut the filter and looked for debris in the pleats. 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. It prevents the computer from switching over to four-cylinder mode. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. 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. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. 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. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. Number 7 cylinder lifters stops moving when truck starts. Im curious as to how much tran fluid you put in? Learn how your comment data is processed. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. If you left the original cam in, the AFM cylinders will be down about 25 lbs. 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. how many miles do you have on your engine? I had to replace them all and the camshaft as well. I would just have the AFM disabled (tuned out) then. they are known to become plugged. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. Engines with AFM use a high-volume oil pump. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. 50,000 miles. Love the truck so far. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. Hopefully he can free up the stuck/collapsed lifter. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. All ready done valve job . I have a 2014 Silverado with a 5-3. It was good for about 10 miles and started with same loud knock noise. If buying a tuner/chip which works best for that truck/engine? Problems After AFM Delete And How to Solve Them? - Tools Bible I got the AMF disabler anyway and so far so good.