Did Obama make them do this? I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Have there been improvements in more recent model years employing AFM [2014 or newer]? Then I guess I have to spend a bunch of money and get the delete kit. I have 217,000+ on it and it never fails meever! I recently bought a 2018 Silverado 5.3L with AFM. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Is this an issue only with GM SUVs and trucks, or does it include cars too? [], [] as the LS engine familys hybrid engine in trucks and SUVs. 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. What type of disabler did you go with? Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? 330-630-0240. Its not GMs choice to use AFM. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. It depends on the failure mode of the lifter however, certainly worth a try. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Is the Pressure relief valve replaceable? I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Do you think I can still disable AFM? 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! Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). It also has an electrical connector on the back. Yeh truck has 5237 miles on it I cant really tell from driving. Does the disabler prevent the engine damage in the first place? The older truck gets 19 mpg the newer truck with fuel management gets 14. The lifter seems to recharge whenever the truck sits for some time. Pulled the inntake and replaced valleypan With all the solenoids. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! 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 owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? On the AFM lifters that dosnt work i have installed them With the oil hole Down! Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. Will the plug in deactivater fix the oil consumption or will it cause more consumption? im going to plug in a dissabler when im done to keep it V8 mode all the time. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. 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. what deleter (if thats a real word) have you heard good things about. Really could use some pointers. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Chevrolet 5.3 Engine Issues and Recommendations Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. I already ordered the parts to replace myself and remove the code. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I would just have the AFM disabled (tuned out) then. 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 cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. How do you know if the lifter has failed? She started to have the lifter problem again after 60,000 miles more. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Thankfull for any ideeas! It does seem that when they start goingthey go quickly. It seems this tough engine has everything incorporated into it. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? They took the engine down today found so much damage inside they ordered a new engine from Detroit. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. All the time. 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. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. 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. 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 just did the delete and replaced the cam as well. Then again, it should have never been controlling those solenoids. 50,000 miles. No problems with any to this point. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? You could also have tried that if the trans oil didnt work. Any help would be appreciated. What would you do if you were in my situation? Replaced all lifters on passenger side as well as pushrods for even wear. 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. The computers had not evolved enough to control the sytem. Truck has an active P0300 code and runs very rough. I would appreciate any feedback. I can literally drive from Seattle to Redding CA on one tank. The dealer in Rockhill, SC when asked only said they had not had a problem. There is a good chance that some of the drivers side lifters decided to go. As you said, the ECM was never seeing the AFM so I think youre good to go. GM should recall every vehicle with this terrible design flaw! [] they have a downside? I am confused about the plug in disabler. Take a look at what bmw did in its R1250 bike. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? New plugs and wires. Accept i only have 60K on my truck and it hasnt recovered. What the biggest reported problem with Chevy Silverados? TheAFMsystem can be identified by its components. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. Its not possible to install them wrong? Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. whith a disabler. I have already dropped a lot of money on this truck (08 suburban). We believe this confirmed that the AFM has never been operating in this vehicle. 1. 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". It is being covered under warranty since I only have 72,000 miles on it. Love the truck. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). 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. Does the Pressure relief vavle ever go bad?? Not sure which direction to go from here. If I had wanted a 4 banger I would have bought one. 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? My question is: do I install the electronic disabler on the new engine to avoid future issues? Most will want to get rid of the AFM immediately and VVT isnt for []. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. GM offers the following diagnostic steps in determining if this is the problem. Everything else looked good. I am having that done today on my 08 Suburban and its only costing me $225. The oil collapses the plunger inside the lifter. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. All New lifters were from AC delco. Why would GM ever produce such problems with such little to gain. Loved the looks and interior and thought a I got a great deal at $6k even. There are no changes in the valves or the springs. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . I dont know where to being to look for the problem. Very expensive repair too! Thank you. I know I felt the same way. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. TheAFMcylinders are opposite of one another in the firing order. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. .or something similar . I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. It was good for about 10 miles and started with same loud knock noise. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. It came back on last Wednesday starting with a flash. . Will this AFM DISABLER damage anything???. Any truth to that? put tran fluid in oil for a day till lifter became active, had to change the fouled plug. is it still working good since you have done that with the trans fluid? An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. A 14 gmc 5.3 Sierra 85000 miles Battery was unplugged for a week.. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). After all we bailed them out of bankruptcy. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Your email address will not be published. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Covers me to 100K. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. Just pulled it down in the garage there was no other damage , luckily. Once I get it back, could I install the Disabler safely. I own a reputable repair shop. 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. Most of all, my concern is reliability. I call it active obama fuel management .A scam . The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. They are taller and have special oil holes. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Would it be fine to go ahead with the AFM Disabler? I have a 2011 GMC with over 162,000 miles on it and it runs great! another common cause for low OP is the oil pick up tube O ring. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. The system uses solenoids to deliver oil pressure to control. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Its got a hundred forty-five thousand miles on it. Just one or two. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? [], [] 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 shut AFM off. 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. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Id wait until the warranty expires then disable. Thank you again for the response. I would rather stay a V8 full time than deal with AFM issues in the future. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Everything was fine for two weeks, ow customer complains s it same noise it made as before. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I have an 07 Yukon with over 180K. However, they are only functional on engines that usedAFM. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. [] 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. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Unfortunately, I found out about the lifters too late. Was a disaster then but a profitable disaster. The oil is baked on to every component. If someone didnt want to spend gas buy a Toyota. I will keep reading and take notes. I am hoping this does the trick. 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. I read something the other day which I found to be funny. 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. Sylinder one lost compression on my 09 5,3. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). 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 only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. 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). I always have done my oil changes on time, not sure about the people who owned it before me though. GM get a clue! The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. I have the towing package on my 13 Tahoe LTZ. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. 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. AFMengines use special lifters for cylinders 1, 4, 6, and 7. IMHO . This is my project car and will be my drive (about 5000 miles a year). Since no air can get in or out, four cylinders provide no power. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. Thats not all bad because it saves the cost of an AFM delete kit. She had driven it for a couple of months that way. AFM - active fuel management strategy which deactivates the lifters on specific . Still have no power. 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 2014 Silverado with a 5-3. Here's what you need to know: 1. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Chris, when you did your delete, did you also change the cam at the same time? Friend will send to me from Arizona. 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. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. So I did the job one more time. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Perhaps a flaw by design would be a more appropriate description . It uses a M14 x 1.5 thread plug like Dorman 65217. At this state, a disabler would probably do what you need it to do. But the problem at that time was the computer technology. Also putting in a new transmission vs. rebuilding. 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.

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