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? I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. They lasted one year with big problems. Welcome to socialism folks . . All Gen IV engine blocks haveAFMtowers and oil passages cast in. The oil is baked on to every component. it is the regulator guy! I only had 81k on the motor. Glad I did. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. I dont know where to being to look for the problem. 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. 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. Replacing engine due to issues caused by AFM. Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? is it still working good since you have done that with the trans fluid? 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. Chevrolet 5.3 Engine Issues and Recommendations 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. Most will want to get rid of the AFM immediately. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. has 92,000 miles and was just told I have cam and lifter failure. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . I havent has any lifter or cam issues. .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 am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. misfire or anything. It has AMF. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. Fortunately I received a reducing in house shop hourly rate. . GM should recall every vehicle with this terrible design flaw! 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. 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. There are no changes in the valves or the springs. The dealer in Rockhill, SC when asked only said they had not had a problem. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. A 14 gmc 5.3 Sierra 85000 miles The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. It is usually first noticed during highway driving. Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. A 14 gmc 5.3 Sierra 85000 miles I always have done my oil changes on time, not sure about the people who owned it before me though. lol. If possible, will simply not using VVT provide a powerful,good running engine? 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 ! IMHO . AFM - active fuel management strategy which deactivates the lifters on specific . Now you tell me AFM works and I will tell you; that you are full of shit! You may want to update your post. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. No movement on the rocker arms. Not sure which direction to go from here. Here's what you need to know: 1. Thanks for your help. Lost number four I can literally drive from Seattle to Redding CA on one tank. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. They dont so any better than domestics on mpgs. My fear now is not will it happen but when! Have not had a problem yet. 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. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. I will be installing the AFM deactivator tonight when I get hoe. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Yes thats true. It was good for about 10 miles and started with same loud knock noise. I went with the new motor for the warranty. I am confused about the plug in disabler. Can they be faulty? Was a disaster then but a profitable disaster. The 2nd went with a conventional valvetrain. Some guys have been able to use a tool through the top with the cover off to get it to release. On the AFM lifters that dosnt work i have installed them With the oil hole Down! Sylinder one lost compression on my 09 5,3. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. If the 4th cylinder lifter has failed, would driving it damage the engine? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . 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. I have a 2014 Silverado with a 5-3. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. RANGE TECNOLOGY.COM. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . 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! It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. 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. GM get a clue! Only running on drivers side cylinders. 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. Would it be fine to go ahead with the AFM Disabler? How about if they just let us have a manual transmission agains for fuel mileage? Hopefully more is known by then. Most of all, my concern is reliability. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . I ran 0W-20 on more the 5000 miles between changes. There are so many more oil passages on engines these days. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. I have a 2013 1500 with the LC9. My 5.3 has a vin code of O. Would installing the Disabler solve this? Pod. 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). Next day, fired it up to take the the junk yard and it ran great. Everything else looked good. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. The detergent. Engine oil pressure is fine. Then had to drive the truck back to Tampa from Cheifland Fl. 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. If you are using VVT, you could use the NAL-12612273 (L92) cam. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. There are so many moving components in an engine these days as opposed to the past. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. Battery was unplugged for a week.. I would just have the AFM disabled (tuned out) then. Call chevy.They should being paying most of that. My 2002 I had over 298K on it with no engine related issues. It prevents the computer from switching over to four-cylinder mode. 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. Im always sorry to hear when people run into issues like these. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . It also mentions a valve cover replacement with revised PCV valve design. GM claims fuel improvements ranging from 5%-15% depending on the engine. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. My Wifes 17 Buick with afm was my attempt to get back to gm. HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. 190k on the motor always ran AMSOIL full synth since new. 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. AFMengines use special lifters for cylinders 1, 4, 6, and 7. No problems with any to this point. Im crossing my fingers it does the trick! Just one or two. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Junk . This is my project car and will be my drive (about 5000 miles a year). I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. 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? another common cause for low OP is the oil pick up tube O ring. I loved this rtuck until this happened!! Another option is to plug it entirely if the AFM is already removed. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block.