I went with the new motor for the warranty. . 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. (Non-AFM engines have a smooth cover.). Next day, fired it up to take the the junk yard and it ran great. 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. Welcome to socialism folks . Thanks for the advice Brian! Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? My 5.3 has a vin code of O. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I wont bother with blocking the relief valve. 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. If buying a tuner/chip which works best for that truck/engine? If someone didnt want to spend gas buy a Toyota. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Thanks for the detailed post! I ran 0W-20 on more the 5000 miles between changes. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Any advice that you could offer would be great. 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? The dealer in Rockhill, SC when asked only said they had not had a problem. With 40000 But if you dont like it. AFMlifters have a history of failing and oil consumption can be a problem. This lowers the cost of building it [], [] aluminum block engine. Its got a hundred forty-five thousand miles on it. It actavated the lifter? will feel like a jerk asking the clerk at lowes to cut them again. Can they be faulty? [], [] as the LS engine familys hybrid engine in trucks and SUVs. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. This system is the most effective way to disable AFM. Do not pay that amount. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. how many miles do you have on your engine? My fear now is not will it happen but when! I ran 0W-20 no more the 5000 miles between changes. Friend will send to me from Arizona. I had one fail and it chattered the cam to the point that I had to Install a new cam. I would just have the AFM disabled (tuned out) then. The collapsed lifters will not engage the pushrods and both valves remain closed. 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. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. My question is: do I install the electronic disabler on the new engine to avoid future issues? All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. they are known to become plugged. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. I guess I might have to call a dealership or GM to get a definite answer on this one. All these comments on the 5.3 are blowing my mind!!!. Call chevy.They should being paying most of that. I have a noise in the engine but it seems to go away when revved up. He used seafoam and changed to synthetic oil. I recently took a long trip and it burned 1.5 quarts of oil. Because its not just GM that have engine problems. I ordered a electronic disabler for it today. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Chevrolet 5.3 Engine Issues and Recommendations 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. Theyre also notorious for bad cam tower oil leaks. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. Only running on drivers side cylinders. Yes, always change all the lifters at once. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. The engine has flex-fuel capability. Chris, when you did your delete, did you also change the cam at the same time? There are no changes in the valves or the springs. 4,7 plugs foul runs rough at idle. Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. GM get a clue! 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. When you don't need the full power of the engine, it provides better fuel economy." Perhaps a flaw by design would be a more appropriate description . Thanks. [], [] LS Tech: How to Delete VVT or DisableAFM []. Teflon coatings does not last. 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. 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. But it also restricts passages that the oil runs through. There is a good chance that some of the drivers side lifters decided to go. Most of all, my concern is reliability. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Open to suggestions about best course of action. im going to plug in a dissabler when im done to keep it V8 mode all the time. We believe this confirmed that the AFM has never been operating in this vehicle. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Carbon Build-Up in the Intake Ports. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. I can literally drive from Seattle to Redding CA on one tank. CHANGE YOUR OIL!!!!! On the AFM lifters that dosnt work i have installed them With the oil hole Down! Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Im praying that my RangeTech buys me a few years. Are you saying that I am in the clear by a year and issues fixed? You were lucky that it worked. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Install the disabler when you get your Yukon back and it will remain in good working order. I dont know where to being to look for the problem. Since no air can get in or out, four cylinders provide no power. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. 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! I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. AFM Sucks!!! 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. 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. They should let us the better mileage. TheAFMsystem can be identified by its components. [] 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. 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. The engine is running on only four cylinders. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] The oil is baked on to every component. 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. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. I love the car so far. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. The 2016+ Tacomas are junk. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . 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? When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. 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. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. 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 . .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. I have an 07 Yukon with 230k on the engine. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. . I asume low oil pressure cant make some of the DOD lifters to malfunction? It could be the filter screen under the oil sending unit. One the other hand, it came without AFM, VVT, or flex fuel capability. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . So for all of you that continue to complain about how bad these things are. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Only thing I noticed with the oil consumption issue. Its a CA EMMISIONS TRUCK. Who knew? . I have a 2012 Chevy Avalanche. These trucks cost too much to have a terrible product. Put everything back together proper torque, gakets, valve seals, etc. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps.
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