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). General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. (Non-AFM engines have a smooth cover.). A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. I couldnt agree with you less, yet I respect your opinions. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? 50,000 miles. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Really could use some pointers. Whats the next step? 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. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. Have there been improvements in more recent model years employing AFM [2014 or newer]? HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. Sylinder one lost compression on my 09 5,3. Yeh truck has 5237 miles on it The computers had not evolved enough to control the sytem. Fouls those plugs. But not sure very annoying. Its not GMs choice to use AFM. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority If the lifter actually fails so that the mechanism wont release, it wont work. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Yes thats true. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Thanks for the advice Brian! 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. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. I would. All these comments on the 5.3 are blowing my mind!!!. will feel like a jerk asking the clerk at lowes to cut them again. Please report back if you have any issues, but I think you are in good shape. Active Fuel Management - Wikipedia If you think GM pioneered cylinder deactivation, guess again stalled in a certain way a warning wouldn be a bad idea. You cannot compare them to old 350s. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo 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. So now at 168 thousand miles it still runs good but gets bad gass mileage. 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. Did Obama make them do this? 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. A 14 gmc 5.3 Sierra 85000 miles The write up confuses me. At this state, a disabler would probably do what you need it to do. Hopefully he can free up the stuck/collapsed lifter. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Once the lifter has been damaged, the cam is probably also damaged. Disable the afm. I told her to never pull the gadget out. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . It works . [], [] way. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority This is my project car and will be my drive (about 5000 miles a year). I hate it. I did noticed the oil consumption but it was rare that I would have to add oil. What the biggest reported problem with Chevy Silverados? misfire or anything. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. so the trans fluid worked for you then? 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 trucks are only supposed to use two four. Having it fixed now, just curious Seems like a problematic design. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. The original version sprayed oil on the cylinder walls and increased oil consumption. im going to plug in a dissabler when im done to keep it V8 mode all the time. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. GM offers the following diagnostic steps in determining if this is the problem. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. It uses a M14 x 1.5 thread plug like Dorman 65217. They dont so any better than domestics on mpgs. I love the car so far. Id wait until the warranty expires then disable. Ketil, let us know what you find out. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Glad I did. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Loved the looks and interior and thought a I got a great deal at $6k even. They should let us the better mileage. I may just do that Vic. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. 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. Todays computers are faster so it does work. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. One the other hand, it came without AFM, VVT, or flex fuel capability. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. When you eliminate the AFM system, the extra oil is no longer needed. Most of all, my concern is reliability. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. It has 8,000 miles on it. Driver reported this occurred suddenly while driving down the highway. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Then it takes out the lifter again and again until you bite the bullet and replace the cam. If I had wanted a 4 banger I would have bought one. Mine did at the exact same time. AFM Sucks!!! I went with the new motor for the warranty. There are no changes in the valves or the springs. Every one of these engine will have a lifter fail, this is a travesty! Yes a poor design but a flaw ? Basically rebuilt most of the engine while in the vehicle. More information can be found in the GM TSB bulletin number 10-06-01-008g. Engine starts but is throwing a misfire on cyls 4,7. If possible, will simply not using VVT provide a powerful,good running engine? hi brian when you replace the lifters do you have to change the guides also? How is that an improvement. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? Hi Brian, 190k on the motor always ran AMSOIL full synth since new. Then I guess I have to spend a bunch of money and get the delete kit. 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. I always have done my oil changes on time, not sure about the people who owned it before me though. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . Hi Grant is that disabler still working for you ? Number 7 cylinder lifters stops moving when truck starts. Another option is to plug it entirely if the AFM is already removed. Had nothing but trouble out of it. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. Love the truck so far. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps. Took the heads off again. There has been a lifter noise since I bought the truck 1 year ago. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. Is this the shield you referred to in a past post? Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Solenoids, new lifters also test voltage to solenoid pack all good their, The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Still have no power. Does the Pressure relief vavle ever go bad?? I have an 07 Yukon with over 180K. Carbon Build-Up in the Intake Ports. Is there any potential down-side to doing this in other words, might this do more harm than good? The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). 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. It depends on the failure mode of the lifter however, certainly worth a try. Everything else looked good. I would say maybe 5% of my customers keep up on their oil changes. On one hand it has an aluminum block, which is nice. Regardless of the AFM solenoid being commanded on or off. Covers me to 100K. There are so many more oil passages on engines these days. After reading these forums Im a little concerned about my decision to stay with GM. .IMHO . I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Is there any reaction to the disabler when pulling a boat or trailer? [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). But after reading this thread, Im a little concerned about the long-term reliability. Pulled the inntake and replaced valleypan With all the solenoids. 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.