https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Told her that it would not last and that she needed to find a different way to get around. Because I want to. Its Chrysler and Ford. I noticed this discussion mainly addresses Chevy Silverados and other trucks? As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. I just did the delete and replaced the cam as well. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? The oil is baked on to every component. 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. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Install ls3 valley cover. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Can I (should I) also change to a standard volume oil pump? If I put my truck in manual 5, it doesnt try to go into V4 mode. The detergent. AFMlifters have a history of failing and oil consumption can be a problem. Did not help. 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 have no other engine problems and Id like to fix the issue. changed oil , its all working now, but want to disable this sorry system. Will this AFM DISABLER damage anything???. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? Solenoids, new lifters also test voltage to solenoid pack all good their, Brian, Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. Who knew? Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Does the disabler prevent the engine damage in the first place? Most will want to get rid of the AFM immediately. Change your oil. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. A 17 with 5.3. 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. Engine oil pressure is fine. Or not because it is the cast iron block and not he aluminum block? I only had 81k on the motor. Cylinder Deactivation to the Rescue. It prevents the computer from switching over to four-cylinder mode. misfire or anything. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. Found that all passenger side cylinders are not firing. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Our 2013 yukon with 47k miles just failed. 2 15 with 5.3 Sierras both with 100k and 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. My question is: do I install the electronic disabler on the new engine to avoid future issues? We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. Ive only put a straight pipe exhaust, intake, and a boost controller on it. . I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. But after reading this thread, Im a little concerned about the long-term reliability. I am wondering the same thing. Don't even get me started on the shortened life of the cooling, starting and charging systems. I wont bother with blocking the relief valve. NOT GOOD!! TheAFMsystem can be identified by its components. This is my project car and will be my drive (about 5000 miles a year). September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. The most common issue GM vehicle owners with AFM report is increased fuel consumption. 1. But then she passed away from cancer. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . The only solution is to replace the entire cylinder head. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? Hello! Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. thank You so much! Then it takes out the lifter again and again until you bite the bullet and replace the cam. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Do you think I can still disable AFM? Dont want to make a move on a new truck or jump to a 2500 yet. My 2002 I had over 298K on it with no engine related issues. Hi. I got the AMF disabler anyway and so far so good. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Replace the cam or do the delete kit? You will get codes thrown if the afm is physically removed without telling the ECM you did so. I recently bought a 2018 Silverado 5.3L with AFM. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Thats not all bad because it saves the cost of an AFM delete kit. Disable the afm. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Love the truck. Keith, were happy to help. If you ignore it and keep driving, odds are you will destroy the cam as well. Welcome to socialism folks . This system is the most effective way to disable AFM. I plan on getting a tuner to disable the AFM. they are known to become plugged. It has the orings in place, that seals the towers. Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. The 2nd went with a conventional valvetrain. Fortunately, the old engine hadnt been shipped back to the remanufacturer. The biggest problem is nobody changes their oil on time. This happened on a camping trip with my kids last friday night. Seafoam with syn oil change only fixed for a week. 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. Id wait until the warranty expires then disable. Its not possible to install them wrong? I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Next day, fired it up to take the the junk yard and it ran great. Would you get enough power to drive at freeway speeds? I have a 2013 1500 with the LC9. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Yes thats true. I sold them when they were new. 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. My Wifes 17 Buick with afm was my attempt to get back to gm. Excess oil will be pushed out of the pressure relief valve into the oil pan. It came back on last Wednesday starting with a flash. The trucks are only supposed to use two four. Send response to tkrieg@cox.net. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Cost about $250, but it is not fool proof. How about if they just let us have a manual transmission agains for fuel mileage? Have a lifter problem on my 2010 5.3 Silverado. Love the truck so far. 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. 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. If the lifter actually fails so that the mechanism wont release, it wont work. I have the towing package on my 13 Tahoe LTZ. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. 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. 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. I cant really tell from driving. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. Why would GM ever produce such problems with such little to gain. I would just have the AFM disabled (tuned out) then. [], [] 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. I drive the same 320 mile trip every two weeks and drive the same route and full tank. is it still working good since you have done that with the trans fluid? the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. I would appreciate any feedback. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? He used seafoam and changed to synthetic oil. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. Oil flows to the special lifters through theAFMtowers. On one hand it has an aluminum block, which is nice. AFM - active fuel management strategy which deactivates the lifters on specific . Why this happens is a more . Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Hello. Open to suggestions about best course of action. This system was originally used in early 1980s Cadillacs. The valve itself is part number W0133-2574213. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. 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 am trying to prevent same issue. Dont drive it if you have a dead cylinder due to afm failure. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Any advice that you could offer would be great. Having a hard time finding one .. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Friend will send to me from Arizona. The wife however found this deal on an Envoy Denali . This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Now you tell me AFM works and I will tell you; that you are full of shit! I hate it. Brian, thank you for the quick response. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. GM switched over to the 4100 v-8 in 1982. Runs better than new now and no more oil consumpsion!! This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. Driver reported this occurred suddenly while driving down the highway. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . I have an 07 Silverado 1500 ltz. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. 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. RANGE TECNOLOGY.COM. hi brian when you replace the lifters do you have to change the guides also? They have plastic casing, so you can imagine what will happen with aged plastic. .IMHO . 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! A tuner can often fix that as well by giving it some more ignition advance in these regions. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. [] 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. Chevrolet 5.3 Engine Issues and Recommendations I read something the other day which I found to be funny. Ive been reading, with disgust and concern of the lifter/cam situation. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. They may be able to find some of those missing ponies. I ran 0W-20 on more the 5000 miles between changes. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. I have successfully used a gadget that plugs into the ODBII. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Just shut AFM off. We believe this confirmed that the AFM has never been operating in this vehicle. I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. I have read synthetic isnt good for AFM lifters. Took the heads off again. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. do you fill to capacity anyways???? Replaced all lifters on passenger side as well as pushrods for even wear. This basically deactivates the cylinder deactivation system. 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. The system uses solenoids to deliver oil pressure to control. Your email address will not be published. Really could use some pointers. Regarding the cylinder deactivation impact on fuel consumption . No it runs fine on sylinder one but not on 6 or 7!!! I am trying to find out of this is true. Can they be faulty? These trucks cost too much to have a terrible product. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. The dealer in Rockhill, SC when asked only said they had not had a problem. 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. Most will want to get rid of the AFM immediately and VVT isnt for []. I have a 2011 GMC Sierra 1500 with the 5.3. 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. 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? It is being covered under warranty since I only have 72,000 miles on it. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? 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. Would doing the disabler option once I get it back be the right one? 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. I will keep reading and take notes. I always have done my oil changes on time, not sure about the people who owned it before me though. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Then had to drive the truck back to Tampa from Cheifland Fl. Basically rebuilt most of the engine while in the vehicle. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? My fear now is not will it happen but when! I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. 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. The original version sprayed oil on the cylinder walls and increased oil consumption. Any problems to watch out for?Did you replace the VLOM? Just one. A 14 gmc 5.3 Sierra 85000 miles It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. It does seem that when they start goingthey go quickly. I know a few guys with Tundras. Truck has an active P0300 code and runs very rough. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. 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. Should I wait until the warranty runs out, or will that be too late to stop possible damage? I speak from some experience. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. I own a reputable repair shop. has 92,000 miles and was just told I have cam and lifter failure. 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. 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. GM claims fuel improvements ranging from 5%-15% depending on the engine. Only running on drivers side cylinders. Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? I am hoping this does the trick. 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. Also putting in a new transmission vs. rebuilding. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris. Is this the shield you referred to in a past post? I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. 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.
gm cylinder deactivation problemssince 1927.
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