We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. 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. I recently bought a low mileage 2013 Silverado and the lifters collapsed. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Had nothing but trouble out of it. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Brian, Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. 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 L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Driver reported this occurred suddenly while driving down the highway. is it still working good since you have done that with the trans fluid? 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. The dealer in Rockhill, SC when asked only said they had not had a problem. I ave noticed the point about excess oil spray. [], [] LS Tech: How to Delete VVT or DisableAFM []. My question on a 2007 Chevy Tahoe 5.3 AFM I have a 2013 1500 with the LC9. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Their tech guys have seen it all and may have some thoughts on this as well. Friend will send to me from Arizona. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Changing the sensor didnt help. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. Hello! If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Not sure which direction to go from here. . 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. the extra oil isnt needed. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? Diablo says yes but they do not provide tunes. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. Love the truck so far. I drive the same 320 mile trip every two weeks and drive the same route and full tank. He unstuck it and I took it for a drive and same thing happened. He used seafoam and changed to synthetic oil. Hi Brian, I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Found that all passenger side cylinders are not firing. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. I just bought a 2018 Silverado. []. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. 50,000 miles. It actavated the lifter? Have there been improvements in more recent model years employing AFM [2014 or newer]? 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). Any problems to watch out for?Did you replace the VLOM? December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. I noticed this discussion mainly addresses Chevy Silverados and other trucks? 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. It works . An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. TheAFMcylinders are opposite of one another in the firing order. Its ribbed with solenoids on the underside. Yes, always change all the lifters at once. 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. How is that an improvement. I would appreciate any feedback. Pushing forward. 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. It is replaceable.. just remove oil pan and it will be on top at the filter. 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. Will this AFM DISABLER damage anything???. 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. It only has about 9k miles on it. NOT GOOD!! 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 pulled it down in the garage there was no other damage , luckily. Hi Grant is that disabler still working for you ? Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. When you eliminate the AFM system, the extra oil is no longer needed. Thanks for the detailed post! WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. You are correct. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Constant engine and transmission problems. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. Put everything back together proper torque, gakets, valve seals, etc. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. 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. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. Replaced all lifters on passenger side as well as pushrods for even wear. She had driven it for a couple of months that way. Most will want to get rid of the AFM immediately and VVT isnt for []. How do you know if the lifter has failed? The computers had not evolved enough to control the sytem. The engine had 200K miles. If you left the original cam in, the AFM cylinders will be down about 25 lbs. I asume low oil pressure cant make some of the DOD lifters to malfunction? I have a 07 Yukon with 180K and no issues what so ever. I ordered a electronic disabler for it today. Regards, Any advice that you could offer would be great. It came back on last Wednesday starting with a flash. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Have a lifter problem on my 2010 5.3 Silverado. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Looking to tear down myself. How about if they just let us have a manual transmission agains for fuel mileage? A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. 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 If possible, will simply not using VVT provide a powerful,good running engine? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Does the disabler prevent the engine damage in the first place? This is in response to pretty much everyone. Regardless of the AFM solenoid being commanded on or off. Can I (should I) also change to a standard volume oil pump? Told her that it would not last and that she needed to find a different way to get around. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Toyota has their own problems. No other V-8 truck of similar weight can do that (except another GM with AFM). It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. You could also have tried that if the trans oil didnt work. If you ignore it and keep driving, odds are you will destroy the cam as well. The engine also had 799 or 243 casting heads which are closely related to the LS6. Dont want to make a move on a new truck or jump to a 2500 yet. It has the orings in place, that seals the towers. Brian, thank you for the quick response. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Regarding the cylinder deactivation impact on fuel consumption . I am trying to find out of this is true. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. A 14 gmc 5.3 Sierra 85000 miles In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. All ready done valve job . 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. Very confusing stuff out there. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. Just one. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Cylinders two, three, and eight are all similar in cylinder deactivation. I recently bought a 2018 Silverado 5.3L with AFM. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. I would rather stay a V8 full time than deal with AFM issues in the future. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. It also has an electrical connector on the back. You cannot compare them to old 350s. Some drivers want V8 power under their foot at all times. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. There are no changes in the valves or the springs. 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? 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? I cant really tell from driving. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Looking forward to input from the forum, Thank you. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Thanks. Are you saying that I am in the clear by a year and issues fixed? She started to have the lifter problem again after 60,000 miles more. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. Thanks for your help. 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. GM uses 3 different styles all are engine specific. Was a disaster then but a profitable disaster. 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. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. I may just do that Vic. If I put my truck in manual 5, it doesnt try to go into V4 mode. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? 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. I dont plan on installing the delete kit at this time. [], [] 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. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. GM switched over to the 4100 v-8 in 1982. Once the lifter has been damaged, the cam is probably also damaged. Cylinder Deactivation to the Rescue. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. I speak from some experience. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. Since no air can get in or out, four cylinders provide no power. in your opinion will this work, i really dont see any reason it wouldnt. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. They have plastic casing, so you can imagine what will happen with aged plastic. I have a 12 wit 4.8 Silverado 75000 miles But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Yes a poor design but a flaw ? Any guidance would surely be appreciated. The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5). 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. 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. Pulled the inntake and replaced valleypan With all the solenoids. I always have done my oil changes on time, not sure about the people who owned it before me though. Junk . So now at 168 thousand miles it still runs good but gets bad gass mileage. (Non-AFM engines have a smooth cover.). In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. Wed recommend a call to our partners at Summit Racing. Yes thats true. 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. Brian, I have the same question as Scott. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Yeh truck has 5237 miles on it My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. [] 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 []. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Then again, it should have never been controlling those solenoids. I already ordered the parts to replace myself and remove the code. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? It has 8,000 miles on it. 1. Replace the cam or do the delete kit? As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. There has been a lifter noise since I bought the truck 1 year ago. At this state, a disabler would probably do what you need it to do. 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. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Last GM Ill ever buy unless its got a diesel. 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 quites down to nothing after running for about a minute. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? If the lifter actually fails so that the mechanism wont release, it wont work. 2 15 with 5.3 Sierras both with 100k and After reading these forums Im a little concerned about my decision to stay with GM. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. 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. She drove it for another 35,000 and it went out again. Everything else looked good. what deleter (if thats a real word) have you heard good things about. [], I have a 2012 Silverado Z71 bought new. 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. A tuner can often fix that as well by giving it some more ignition advance in these regions. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. GM offers the following diagnostic steps in determining if this is the problem. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? It is currently at the dealer having a new long block installed under warranty. Hopefully he can free up the stuck/collapsed lifter. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. 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 am wondering the same thing. 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. do you fill to capacity anyways???? I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. I hate it. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Just recently, GM announced a temporary closure. 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. Another option is to plug it entirely if the AFM is already removed. 2011 Chevy Avalanche LTZ. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Because I want to. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. That inherently less smooth operation requires additional NVH dampening. Most of the complaints show up in the 2009 to 2011 model years. 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??? Your email address will not be published. As you said, the ECM was never seeing the AFM so I think youre good to go. Since the tranny oil worked, you should now change the oil, right? Is this an issue only with GM SUVs and trucks, or does it include cars too? I called my service station and they told me to get it in ASAP. 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.
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