As you said, the ECM was never seeing the AFM so I think youre good to go. 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. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Its not possible to install them wrong? But then she passed away from cancer. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . Todays computers are faster so it does work. Looking forward to input from the forum, Thank you. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Truck has an active P0300 code and runs very rough. From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. The valve itself is part number W0133-2574213. How did your turn out? 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. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Hopefully more is known by then. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. 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. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. How to Delete or Disable Active Fuel Management (AFM) When you drain the oil at three to four thousand miles its still clean. 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. Was a disaster then but a profitable disaster. Is there any reaction to the disabler when pulling a boat or trailer? Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. [], [] LS Tech: How to Delete VVT or DisableAFM []. Any truth to that? TheAFMcylinders are opposite of one another in the firing order. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Just recently, GM announced a temporary closure. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. Number 7 cylinder lifters stops moving when truck starts. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 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. AFMlifters have a history of failing and oil consumption can be a problem. i just bought a 2018 Silverado with the 5.3 Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. I have an 07 Yukon with 230k on the engine. Or not because it is the cast iron block and not he aluminum block? .IMHO . All these comments on the 5.3 are blowing my mind!!!. I quites down to nothing after running for about a minute. Didnt change exhaust nor tune so likely no change in power/torque. 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. Some guys have been able to use a tool through the top with the cover off to get it to release. Remembered that after I bought my Tahoe. I did noticed the oil consumption but it was rare that I would have to add oil. The wife however found this deal on an Envoy Denali . So I did the job one more time. Run it and let it soak overnight. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. I am having that done today on my 08 Suburban and its only costing me $225. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. 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. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Runs better than new now and no more oil consumpsion!! Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Will this AFM DISABLER damage anything???. You also need the disabler installed in your obd connector. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Disable the afm. What the biggest reported problem with Chevy Silverados? They have plastic casing, so you can imagine what will happen with aged plastic. Thank you again for the response. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. 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? Most of all, my concern is reliability. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? When you eliminate the AFM system, the extra oil is no longer needed. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Excess oil will be pushed out of the pressure relief valve into the oil pan. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. My question on a 2007 Chevy Tahoe 5.3 AFM Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Now I get 24 to 26 with deactivation locked out and full power. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. I have an 07 Yukon with over 180K. Any guidance would surely be appreciated. I have a 2011 GMC Sierra 1500 with the 5.3. (Bought car 1 day before lifter died!) It depends on the failure mode of the lifter however, certainly worth a try. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. I have no other engine problems and Id like to fix the issue. it is the regulator guy! He unstuck it and I took it for a drive and same thing happened. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Is this the shield you referred to in a past post? What type of ODBII gadget did you use? Chevrolet 5.3 Engine Issues and Recommendations Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. Please report back if you have any issues, but I think you are in good shape. Dont want to make a move on a new truck or jump to a 2500 yet. There has been a lifter noise since I bought the truck 1 year ago. Regards, My fear now is not will it happen but when! Love the truck. I ran 0W-20 no more the 5000 miles between changes. This should be added to your earlier model if you experience oil consumption. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Can I (should I) also change to a standard volume oil pump? Loved the looks and interior and thought a I got a great deal at $6k even. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. Yes thats true. will feel like a jerk asking the clerk at lowes to cut them again. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. How do you know if the lifter has failed? I still get a P0336 code every once in a while but still good to drive around town. There are no changes in the valves or the springs. 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? I couldnt agree with you less, yet I respect your opinions. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. It seems this tough engine has everything incorporated into it. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Oil flows to the special lifters through theAFMtowers. The oil is baked on to every component. I would rather stay a V8 full time than deal with AFM issues in the future. I plan on getting a tuner to disable the AFM. Pulled right valve cover an rockers on syl 6 dont move. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Having it fixed now, just curious Seems like a problematic design. I recently took a long trip and it burned 1.5 quarts of oil. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. This is in response to pretty much everyone. 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. I love the car so far. The LZ1 was upgraded with AFM and []. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. Pod. I just bought a 2018 Silverado. Sylinder one lost compression on my 09 5,3. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? I only had 81k on the motor. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. 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 . Cylinder deactivation works to save fuel, but it may not be for the reasons you think. I recently bought a low mileage 2013 Silverado and the lifters collapsed. what deleter (if thats a real word) have you heard good things about. Since the tranny oil worked, you should now change the oil, right? The computers had not evolved enough to control the sytem. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. If I put the Range module on, is that all I need to do, both now and long term? I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Theyre also notorious for bad cam tower oil leaks. 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. The 2nd went with a conventional valvetrain. GM Releases Valve Lifter Service Update For V8 Engines 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. Pushing forward. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). That inherently less smooth operation requires additional NVH dampening. I call it active obama fuel management .A scam . Also putting in a new transmission vs. rebuilding. Should I wait until the warranty runs out, or will that be too late to stop possible damage? I have 217,000+ on it and it never fails meever! My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. They should let us the better mileage. A tuner can often fix that as well by giving it some more ignition advance in these regions. Its Chrysler and Ford. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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. But the problem at that time was the computer technology. After reading these forums Im a little concerned about my decision to stay with GM. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I just got new warranty engine and dont want this issue again? Very expensive repair too! The dealer in Rockhill, SC when asked only said they had not had a problem. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. 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. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. It was good for about 10 miles and started with same loud knock noise. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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. It only has about 9k miles on it. Pulled the inntake and replaced valleypan With all the solenoids. in your opinion will this work, i really dont see any reason it wouldnt. If you think GM pioneered cylinder deactivation, guess again Send response to tkrieg@cox.net. All the time. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. I havent has any lifter or cam issues. Yes, always change all the lifters at once. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I will be installing the AFM deactivator tonight when I get hoe. How long did it take? I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. But after reading this thread, Im a little concerned about the long-term reliability. Most will want to get rid of the AFM immediately. Its ribbed with solenoids on the underside. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). Wed recommend a call to our partners at Summit Racing. Im servicing a 2011 Chevrolet 5.3 with AFM. What would you do if you were in my situation? Regardless of the AFM solenoid being commanded on or off. The engine has flex-fuel capability. This is my project car and will be my drive (about 5000 miles a year). Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. Have a lifter problem on my 2010 5.3 Silverado. GM get a clue! Put everything back together proper torque, gakets, valve seals, etc. I am hoping this does the trick. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. misfire or anything. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Every one of these engine will have a lifter fail, this is a travesty! . 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? It is also known as Displacement on Demand (DoD) or cylinder deactivation. Once the failure has occurred, the AFM shut off methods other than that probably wont work. However, the fuel savings are not always as much as expected. Did not help. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. 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. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . It was in the late 70s or early 80s and it was a POS, Your memory serves you pretty well I too have the same nightmares lol. If you ignore it and keep driving, odds are you will destroy the cam as well. Then had to drive the truck back to Tampa from Cheifland Fl. I went with the new motor for the warranty.
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