With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. 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. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. The collapsed lifters will not engage the pushrods and both valves remain closed. Verified over hundreds of trips, makes no sense. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. I am having that done today on my 08 Suburban and its only costing me $225. Thank you. Their tech guys have seen it all and may have some thoughts on this as well. Very confusing stuff out there. bought at Brian Tooley Racing ! But then she passed away from cancer. It also has an electrical connector on the back. So for all of you that continue to complain about how bad these things are. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. No it runs fine on sylinder one but not on 6 or 7!!! I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. If you ignore it and keep driving, odds are you will destroy the cam as well. We need availability of a replacement engine without the AFM. 1981 Cadillac V 864. Can you tell me what needs to be done with the VVT? Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. TheAFMcylinders are opposite of one another in the firing order. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. 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. That inherently less smooth operation requires additional NVH dampening. It seems this tough engine has everything incorporated into it. Truck ran fine before that. I quites down to nothing after running for about a minute. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. What type of disabler did you go with? All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Why this happens is a more . Junk . Pod. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. After all we bailed them out of bankruptcy. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Did not help. Its Chrysler and Ford. 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. 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. Some guys have been able to use a tool through the top with the cover off to get it to release. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. I tried the trans fluid in the oil. I dont plan on installing the delete kit at this time. I had to replace them all and the camshaft as well. This really sucks. 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. GM offers the following diagnostic steps in determining if this is the problem. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . What makes you think it was a design flaw ? lol. Thanks for the advice Brian! If you left the original cam in, the AFM cylinders will be down about 25 lbs. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Hi. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. The original version sprayed oil on the cylinder walls and increased oil consumption. Truck has an active P0300 code and runs very rough. He used seafoam and changed to synthetic oil. Carbon Build-Up in the Intake Ports. 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. 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. Im curious as to how much tran fluid you put in? It only has about 9k miles on it. Did Obama make them do this? 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. Having it fixed now, just curious Seems like a problematic design. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! My 2002 I had over 298K on it with no engine related issues. I called my service station and they told me to get it in ASAP. Then it takes out the lifter again and again until you bite the bullet and replace the cam. [], [] as the LS engine familys hybrid engine in trucks and SUVs. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. Have there been improvements in more recent model years employing AFM [2014 or newer]? Loved the looks and interior and thought a I got a great deal at $6k even. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. 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. Call chevy.They should being paying most of that. 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 engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. It is currently at the dealer having a new long block installed under warranty. Was a disaster then but a profitable disaster. Have an intake and Borla exhaust. Here's what you need to know: 1. Now you tell me AFM works and I will tell you; that you are full of shit! This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Most of the complaints show up in the 2009 to 2011 model years. will feel like a jerk asking the clerk at lowes to cut them again. I have a 2014 Silverado with a 5-3. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. There has been a lifter noise since I bought the truck 1 year ago. . It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. how many miles do you have on your engine? I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 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. Most will want to get rid of the AFM immediately and VVT isnt for []. 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 guess I might have to call a dealership or GM to get a definite answer on this one. [] 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. .IMHO . Will the plug in deactivater fix the oil consumption or will it cause more consumption? .or something similar . Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. But it also restricts passages that the oil runs through. it is the regulator guy! I have a 2011 GMC with over 162,000 miles on it and it runs great! That might show up if you cut the filter and looked for debris in the pleats. Never did strand me on the side of the road way. Can they be faulty? What type of ODBII gadget did you use? [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). They are taller and have special oil holes. Still have no power. Cost about $250, but it is not fool proof. Im always sorry to hear when people run into issues like these. . Double digit MPGs in my 98 K1500 would be a dream lmao. 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! Pulled the inntake and replaced valleypan With all the solenoids. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. Cylinder Deactivation to the Rescue. Unfortunately, I found out about the lifters too late. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Constant engine and transmission problems. I am considering the same. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. If buying a tuner/chip which works best for that truck/engine? Pushing forward. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. I read something the other day which I found to be funny. 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. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. I speak from some experience. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. However, the fuel savings are not always as much as expected. I noticed this discussion mainly addresses Chevy Silverados and other trucks? NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. One the other hand, it came without AFM, VVT, or flex fuel capability. Is there any potential down-side to doing this in other words, might this do more harm than good? A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Can I (should I) also change to a standard volume oil pump? GM uses 3 different styles all are engine specific. With 44, its a enormous Jon to remove the oil pan. []. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Ketil, let us know what you find out. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. It could be the filter screen under the oil sending unit. 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. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. $8500.00 fix. Is this an issue only with GM SUVs and trucks, or does it include cars too? Will this AFM DISABLER damage anything???. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. I love the car so far. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Because I want to. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Thats a tough call, if the warranty will cover itId let it run out. I have no clue what to do now. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. No clue what to do. [], [] LS Tech: How to Delete VVT or DisableAFM []. changed oil , its all working now, but want to disable this sorry system. My question on a 2007 Chevy Tahoe 5.3 AFM 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? There are no changes in the valves or the springs. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Because its not just GM that have engine problems. 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. I ran 0W-20 no more the 5000 miles between changes. 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. New plugs and wires. It was well researched and tested back in the late seventies and eighties . The LZ1 was upgraded with AFM and []. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Would installing the Disabler solve this? 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? But not sure very annoying. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. 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. GM switched over to the 4100 v-8 in 1982. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Then again, it should have never been controlling those solenoids. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Traded it with 180K miles and did not experience any problems. There are so many more oil passages on engines these days. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Hello! As you said, the ECM was never seeing the AFM so I think youre good to go. 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. Dont drive it if you have a dead cylinder due to afm failure. Friend will send to me from Arizona. i just bought a 2018 Silverado with the 5.3 [], [] 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. Just one or two. Thanks. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Not sure which direction to go from here. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. Changing the sensor didnt help. I have a 2012 Chevy Avalanche. A 17 with 5.3. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. 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. Oil flows to the special lifters through theAFMtowers. Better airflow reduces drag on the pistons and the associated pumping losses. It came back on last Wednesday starting with a flash. Ive been reading, with disgust and concern of the lifter/cam situation. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Disable the afm. Theyre also notorious for bad cam tower oil leaks. Help appreciated. 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. so the trans fluid worked for you then? 1. Why would GM ever produce such problems with such little to gain. Engine starts but is throwing a misfire on cyls 4,7. How about if they just let us have a manual transmission agains for fuel mileage? 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. 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. This is my second Avalanche and I never had any issues with either of them. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. 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. Does the disabler prevent the engine damage in the first place? 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. 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. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Do not pay that amount. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? I drive the same 320 mile trip every two weeks and drive the same route and full tank. 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. Fouls those plugs. Just pulled it down in the garage there was no other damage , luckily. I was getting ~ 30 mpg, so I love that. Have not had a problem yet. Found that all passenger side cylinders are not firing. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy.
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