NOT GOOD!! 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. The 2016+ Tacomas are junk. Disable the afm. Im confused from the write up about the plug in. Oil flows to the special lifters through theAFMtowers. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority I may just do that Vic. Thank you. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. 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 used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Everything else looked good. 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. We were getting a code that the cam position sensor was not functioning properly. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. If you left the original cam in, the AFM cylinders will be down about 25 lbs. I got the AMF disabler anyway and so far so good. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. 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. If I put the Range module on, is that all I need to do, both now and long term? Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . another common cause for low OP is the oil pick up tube O ring. The wife however found this deal on an Envoy Denali . Only thing I noticed with the oil consumption issue. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Cylinders two, three, and eight are all similar in cylinder deactivation. Found that all passenger side cylinders are not firing. any help? This is my project car and will be my drive (about 5000 miles a year). It also has an electrical connector on the back. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. GM claims fuel improvements ranging from 5%-15% depending on the engine. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. Where can I buy a bolt to replace this relief valve ?? I was getting ~ 30 mpg, so I love that. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. I want to put a AFM disabler in it what all do I need to have done. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Given that, would you recommend buying one of the OBD-II devices to disable AFM? Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. They layed over night in engine oil before instalation. Since no air can get in or out, four cylinders provide no power. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. No other V-8 truck of similar weight can do that (except another GM with AFM). In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. I wont bother with blocking the relief valve. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . 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. Welcome to socialism folks . I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? Any problems to watch out for?Did you replace the VLOM? I have no clue what to do now. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. Install the disabler when you get your Yukon back and it will remain in good working order. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. How do you know if the lifter has failed? As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. 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. If you ignore it and keep driving, odds are you will destroy the cam as well. This should be added to your earlier model if you experience oil consumption. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. 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. Our 2013 yukon with 47k miles just failed. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. I just got new warranty engine and dont want this issue again? Any advice that you could offer would be great. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. More information can be found in the GM TSB bulletin number 10-06-01-008g. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. A 17 with 5.3. do you fill to capacity anyways???? 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 []. [], [] as the LS engine familys hybrid engine in trucks and SUVs. 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. AFMengines use special lifters for cylinders 1, 4, 6, and 7. I had privilege to work on some of that garbage they never did work . She drove it for another 35,000 and it went out again. also in the pan is another AFM oil filter near the external engine oil filter. 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. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Thank you. I ave noticed the point about excess oil spray. The oil collapses the plunger inside the lifter. Truck ran fine before that. Replacing engine due to issues caused by AFM. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Any guidance would surely be appreciated. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. What makes you think it was a design flaw ? It has 8,000 miles on it. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Change your oil. I have a shop 39 yrs . Please report back if you have any issues, but I think you are in good shape. Keith, were happy to help. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. 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. Hello! I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. 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. Did Obama make them do this? The engine is running on only four cylinders. It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". A 14 gmc 5.3 Sierra 85000 miles A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. 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? If under the truck while parked and it is doing it it sounds like it is towards the back of motor. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority 1. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Now Im here tring to figure out what to do. Not sure what else it can be. 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). http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. It is replaceable.. just remove oil pan and it will be on top at the filter. Engine oil pressure is fine. I have an 07 Silverado 1500 ltz. Another option is to plug it entirely if the AFM is already removed. I dont plan on installing the delete kit at this time. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. Does cylinder deactivation affect engine life? - Quora Pulled right valve cover an rockers on syl 6 dont move. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Are there errors or something only the dealer can clear? TheAFMsystem can be identified by its components. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. It has AMF. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC I have a 2014 Chevy Z51 [w/dry sump oiling etc.] The engine also had 799 or 243 casting heads which are closely related to the LS6. Brian, I have been reading your article about the AFM. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. I guess I might have to call a dealership or GM to get a definite answer on this one. Hi. Open to suggestions about best course of action. They are taller and have special oil holes. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Solenoids, new lifters also test voltage to solenoid pack all good their, Cylinder deactivation | GM Truck Club Forum GM should recall every vehicle with this terrible design flaw! . All these comments on the 5.3 are blowing my mind!!!. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. . Runs better than new now and no more oil consumpsion!! 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. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. . You will get codes thrown if the afm is physically removed without telling the ECM you did so. I am confused about the plug in disabler. It has has 9000 miles and no lifter or other issues or codes so far. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso This is my second Avalanche and I never had any issues with either of them. She had driven it for a couple of months that way. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. 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. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. Didnt change exhaust nor tune so likely no change in power/torque. I noticed this discussion mainly addresses Chevy Silverados and other trucks? So I did the job one more time. I would rather stay a V8 full time than deal with AFM issues in the future. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. It depends on the failure mode of the lifter however, certainly worth a try. GM Releases Valve Lifter Service Update For V8 Engines If someone didnt want to spend gas buy a Toyota. Yes thats true. [] 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. Pulled the inntake and replaced valleypan With all the solenoids. When they are locked into position, they wont wear further and cause issues down the road. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. I have an 07 Yukon with over 180K. No clue what to do. I am wondering the same thing. 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. Yes a poor design but a flaw ? Is this an issue only with GM SUVs and trucks, or does it include cars too? If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Told her that it would not last and that she needed to find a different way to get around. 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 Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. 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. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. please respond with your opinion. 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? .IMHO . Would installing the Disabler solve this? 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. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. So now at 168 thousand miles it still runs good but gets bad gass mileage. Disable Active Fuel Management - Ricks Free Auto Repair Advice I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. 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. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Junk . 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Drives way better for my mostly paved road driving. Glad I did. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. All ready done valve job . My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. 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 called my service station and they told me to get it in ASAP. The 5 Most Common Chevy EcoTec3 5.3L Engine Problems Definitely dont want to do anything to fix one problem and create another. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? I will keep reading and take notes. Still have no power. It essentially turns your V8 engine into a V4 which saves fuel. .or something similar . Shame this happened. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. the body is in great shape. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Most will want to get rid of the AFM immediately. I quites down to nothing after running for about a minute. Its ribbed with solenoids on the underside. Oil 0w or 5w -20 The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. []. With 40000 Unfortunately, I found out about the lifters too late. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Should I wait until the warranty runs out, or will that be too late to stop possible damage? 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. Are you saying that I am in the clear by a year and issues fixed? I am considering the same. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. 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. Thanks for the detailed post! They have plastic casing, so you can imagine what will happen with aged plastic. Love the truck so far. 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. Is this due to the AFM being shut off? Now the problems back, I have 180k miles on it now. Fortunately, the old engine hadnt been shipped back to the remanufacturer. 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. This really sucks. 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 . misfire or anything. Now you tell me AFM works and I will tell you; that you are full of shit! Teflon coatings does not last. I am hoping this does the trick. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority 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. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. AFM Sucks!!! Engines with AFM use a high-volume oil pump. 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. The detergent. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Replace the cam or do the delete kit? 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. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? Looking forward to input from the forum, Thank you. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Install ls3 valley cover. I sold them when they were new. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. This is what I keep telling people. Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. 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. I loved this rtuck until this happened!! Thanks. Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? so the trans fluid worked for you then? Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. 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. It was well researched and tested back in the late seventies and eighties . stalled in a certain way a warning wouldn be a bad idea. There has been a lifter noise since I bought the truck 1 year ago. 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. in your opinion will this work, i really dont see any reason it wouldnt. [] they have a downside? Would doing the disabler option once I get it back be the right one? Thanks. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems.

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