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. Really could use some pointers. This basically deactivates the cylinder deactivation system. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. I have a noise in the engine but it seems to go away when revved up. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Having a hard time finding one .. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. 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. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. We need availability of a replacement engine without the AFM. I loved this rtuck until this happened!! And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. It is replaceable.. just remove oil pan and it will be on top at the filter. Where can I buy a bolt to replace this relief valve ?? Just one. The engine had 200K miles. Looking forward to input from the forum, Thank you. This allows the engine to run in V8 mode. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. Thankfull for any ideeas! Junk . RANGE TECNOLOGY.COM. However, the fuel savings are not always as much as expected. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Would doing the disabler option once I get it back be the right one? What was happening to the first is slowly (or quickly in your case) happening to the others. 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. Your email address will not be published. I am wondering the same thing. I will keep reading and take notes. Just shut AFM off. I had a 2007 Yukon XL 5.3 with the AFM. Glad I did. 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. Told her that it would not last and that she needed to find a different way to get around. How long did it take? It essentially turns your V8 engine into a V4 which saves fuel. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. This should be added to your earlier model if you experience oil consumption. is it still working good since you have done that with the trans fluid? Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. I have no clue what to do now. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. 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. Here's what you need to know: 1. . I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. . I have successfully used a gadget that plugs into the ODBII. The Jury is still out on the Gen. 5s but the warranty could be an issue. [], [] as the LS engine familys hybrid engine in trucks and SUVs. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! Lost number four Id wait until the warranty expires then disable. Put everything back together proper torque, gakets, valve seals, etc. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I may just do that Vic. But after reading this thread, Im a little concerned about the long-term reliability. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. On the AFM lifters that dosnt work i have installed them With the oil hole Down! http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Seafoam with syn oil change only fixed for a week. I havent has any lifter or cam issues. Fortunately, the old engine hadnt been shipped back to the remanufacturer. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. 1. It actavated the lifter? The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. If the lifter actually fails so that the mechanism wont release, it wont work. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Regardless of the AFM solenoid being commanded on or off. Would you get enough power to drive at freeway speeds? whith a disabler. If you just crack it without it starting it moves all the time . [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. She had driven it for a couple of months that way. Who knew? [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I would appreciate any feedback. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. 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 . Hello! It seems this tough engine has everything incorporated into it. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Yes thats true. How about if they just let us have a manual transmission agains for fuel mileage? I also notice that it doesnt go into V4 when it is cold. It uses a M14 x 1.5 thread plug like Dorman 65217. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. I have a 2011 GMC with over 162,000 miles on it and it runs great! I would just have the AFM disabled (tuned out) then. . Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). The dealer in Rockhill, SC when asked only said they had not had a problem. 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. She drove it for another 35,000 and it went out again. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Is this an issue only with GM SUVs and trucks, or does it include cars too? Cylinders two, three, and eight are all similar in cylinder deactivation. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. As you said, the ECM was never seeing the AFM so I think youre good to go. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. When they are locked into position, they wont wear further and cause issues down the road. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. I would. Very expensive repair too! Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Is the Pressure relief valve replaceable? There is a chance the cam lobe was stressed and started to deteriorate. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. It could be the filter screen under the oil sending unit. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. In other words, the crankshaft and bearings were not visible. Was a disaster then but a profitable disaster. how many miles do you have on your engine? These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). That inherently less smooth operation requires additional NVH dampening. I drive the same 320 mile trip every two weeks and drive the same route and full tank. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. Thanks. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. . My 5.3 is. Theyre also notorious for bad cam tower oil leaks. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). Didnt change exhaust nor tune so likely no change in power/torque. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Number 7 cylinder lifters stops moving when truck starts. If I put my truck in manual 5, it doesnt try to go into V4 mode. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. GM switched over to the 4100 v-8 in 1982. Once the failure has occurred, the AFM shut off methods other than that probably wont work. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. I only had 81k on the motor. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. stalled in a certain way a warning wouldn be a bad idea. The engine also had 799 or 243 casting heads which are closely related to the LS6. "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. 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. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Ketil, let us know what you find out. Loved the looks and interior and thought a I got a great deal at $6k even. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes The valve itself is part number W0133-2574213. These trucks cost too much to have a terrible product. Since the tranny oil worked, you should now change the oil, right? Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Because I want to. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 2 15 with 5.3 Sierras both with 100k and Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. 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. Is there any reaction to the disabler when pulling a boat or trailer? Oil 0w or 5w -20 Call chevy.They should being paying most of that. Brian, I have been reading your article about the AFM. 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. They lasted one year with big problems. Took it to the dealer and was told I had a collapsed lifter. I had purchased an extended warranty when I bought the truck new. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. I am leaning heavily on installing the AFM disabler. I love the car so far. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Battery was unplugged for a week.. . Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. 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? 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. I am considering the same. When you eliminate the AFM system, the extra oil is no longer needed. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Send response to tkrieg@cox.net. Truck has an active P0300 code and runs very rough. How did your turn out? Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? [], [] way. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Any thoughts or suggestions would be appreciated. That might show up if you cut the filter and looked for debris in the pleats.