It does seem that when they start goingthey go quickly. We were getting a code that the cam position sensor was not functioning properly. The computers had not evolved enough to control the sytem. Thats not all bad because it saves the cost of an AFM delete kit. Yes a poor design but a flaw ? Your email address will not be published. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. I am trying to prevent same issue. Is this due to the AFM being shut off? He stated if I continued to exceed 4500 RPM it would blow the lifters out. I have a Yukon 116k it now needs its 3rd set of lifters and cam. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. One must anticipate this. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. I have a 2011 GMC with over 162,000 miles on it and it runs great! Verified over hundreds of trips, makes no sense. I have read synthetic isnt good for AFM lifters. Learn how your comment data is processed. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Just one or two. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. 4,7 plugs foul runs rough at idle. 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). 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. Can you tell me what needs to be done with the VVT? 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". My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. i just bought a 2018 Silverado with the 5.3 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. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. I would appreciate any feedback. Love the truck. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. I have a 2014 Silverado with a 5-3. Are you saying that I am in the clear by a year and issues fixed? Engine starts but is throwing a misfire on cyls 4,7. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. But not sure very annoying. will feel like a jerk asking the clerk at lowes to cut them again. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Pulled the inntake and replaced valleypan With all the solenoids. The wife however found this deal on an Envoy Denali . Cylinder Deactivation to the Rescue. The most common issue GM vehicle owners with AFM report is increased fuel consumption. . I recently took a long trip and it burned 1.5 quarts of oil. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Will the plug in deactivater fix the oil consumption or will it cause more consumption? 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. Found that all passenger side cylinders are not firing. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Hi Grant is that disabler still working for you ? I have already dropped a lot of money on this truck (08 suburban). A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . 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. How is that an improvement. If you left the original cam in, the AFM cylinders will be down about 25 lbs. How about if they just let us have a manual transmission agains for fuel mileage? 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. Theyre also notorious for bad cam tower oil leaks. Brian, thank you for the quick response. Thankfull for any ideeas! Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. .or something similar . I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. 2 15 with 5.3 Sierras both with 100k and I had privilege to work on some of that garbage they never did work . If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. The valve itself is part number W0133-2574213. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. I dont know where to being to look for the problem. GM switched over to the 4100 v-8 in 1982. I have a 2013 1500 with the LC9. 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! 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. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. I have a 12 with 4.8 Silverado 75000 miles General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Cant believe they havent fixed this in a decade. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. 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. has 92,000 miles and was just told I have cam and lifter failure. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Ill Never Ever buy another gm. 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. When they are locked into position, they wont wear further and cause issues down the road. Sylinder one lost compression on my 09 5,3. I sold them when they were new. Very confusing stuff out there. Hello. The lifter seems to recharge whenever the truck sits for some time. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Your email address will not be published. I just bought a 2018 Silverado. I plan on getting a tuner to disable the AFM. Toyota has their own problems. There are so many moving components in an engine these days as opposed to the past. Told her that it would not last and that she needed to find a different way to get around. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Thanks. I call it active obama fuel management .A scam . 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. 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. Had similar problems under warranty, no telling what they rigged me up with at the dealer. This is what I keep telling people. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). All Cylinders. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. 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. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. 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. 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. 1. If the 4th cylinder lifter has failed, would driving it damage the engine? Most of the complaints show up in the 2009 to 2011 model years. I couldnt agree with you less, yet I respect your opinions. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. 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. It was well researched and tested back in the late seventies and eighties . Did not help. [], [] way. I got the AMF disabler anyway and so far so good. $8500.00 fix. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. The oil is baked on to every component. With 40000 Have an intake and Borla exhaust. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Solenoids, new lifters also test voltage to solenoid pack all good their, Never did strand me on the side of the road way. There are 5.3 cylinder deactivation problems that can occur. I havent has any lifter or cam issues. I speak from some experience. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Last GM Ill ever buy unless its got a diesel. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Is there any reaction to the disabler when pulling a boat or trailer? Oil flows to the special lifters through theAFMtowers. the extra oil isnt needed. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? If possible, will simply not using VVT provide a powerful,good running engine? Im crossing my fingers it does the trick! I drive the same 320 mile trip every two weeks and drive the same route and full tank. changed oil , its all working now, but want to disable this sorry system. This really sucks. Looking forward to input from the forum, Thank you. I only had 81k on the motor. 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. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. After reading these forums Im a little concerned about my decision to stay with GM. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. I would appreciate it if you let me know how you make out. Replacing engine due to issues caused by AFM. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. My question on a 2007 Chevy Tahoe 5.3 AFM 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 []. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 1981 Cadillac V 864. Install the disabler when you get your Yukon back and it will remain in good working order. I can literally drive from Seattle to Redding CA on one tank. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Fortunately I received a reducing in house shop hourly rate. All ready done valve job . Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? 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. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . This basically deactivates the cylinder deactivation system. It has has 9000 miles and no lifter or other issues or codes so far. 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. If buying a tuner/chip which works best for that truck/engine? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Get this, rebuild is only rings and maybe lifters. Drives way better for my mostly paved road driving. There has been a lifter noise since I bought the truck 1 year ago. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy 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 I put the Range module on, is that all I need to do, both now and long term? AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Hi Mike, the metal shield you noticed is probably the windage tray. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. please respond with your opinion. Dont drive it if you have a dead cylinder due to afm failure. Just shut AFM off. It depends on the failure mode of the lifter however, certainly worth a try. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. they are known to become plugged. Regardless of the AFM solenoid being commanded on or off. They lasted one year with big problems. Im praying that my RangeTech buys me a few years. 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. Is the Pressure relief valve replaceable? My 2002 I had over 298K on it with no engine related issues. 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. I would just have the AFM disabled (tuned out) then. Perhaps a flaw by design would be a more appropriate description . Better airflow reduces drag on the pistons and the associated pumping losses. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Are there errors or something only the dealer can clear? 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. Its not GMs choice to use AFM. It came back on last Wednesday starting with a flash. Accept i only have 60K on my truck and it hasnt recovered. All these comments on the 5.3 are blowing my mind!!!. bought at Brian Tooley Racing ! 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. 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. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Im curious as to how much tran fluid you put in? Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . I have an 07 Yukon with over 180K. The collapsed lifters will not engage the pushrods and both valves remain closed. She started to have the lifter problem again after 60,000 miles more. I cant really tell from driving. The LZ1 was upgraded with AFM and []. I had to replace them all and the camshaft as well. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Easier said than done. Replaced all lifters on passenger side as well as pushrods for even wear. [] 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 []. Brian, I have the same question as Scott. Whats the next step? Toyota will be my next truck unless GM owns up and makes wright with consumers. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Then again, it should have never been controlling those solenoids. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Still have no power. I also notice that it doesnt go into V4 when it is cold. This is my project car and will be my drive (about 5000 miles a year). My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Mine did at the exact same time. That inherently less smooth operation requires additional NVH dampening. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. But after reading this thread, Im a little concerned about the long-term reliability. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. misfire or anything. Once the failure has occurred, the AFM shut off methods other than that probably wont work. I have a 2011 GMC Sierra 1500 with the 5.3. They are taller and have special oil holes. 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. The problem:. 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 was happening to the first is slowly (or quickly in your case) happening to the others. I have a shop 39 yrs . My 5.3 is. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Service manager said nothing else needs to be replaced because the engine has a Teflon coating.
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