. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. There are so many moving components in an engine these days as opposed to the past. GM uses 3 different styles all are engine specific. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. 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 is usually first noticed during highway driving. The engine is running on only four cylinders. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. I only had 81k on the motor. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. 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. Is this the shield you referred to in a past post? No movement on the rocker arms. It was good for about 10 miles and started with same loud knock noise. It was in the late 70s or early 80s and it was a POS, Your memory serves you pretty well I too have the same nightmares lol. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. .IMHO . Ive only put a straight pipe exhaust, intake, and a boost controller on it. It essentially turns your V8 engine into a V4 which saves fuel. Their tech guys have seen it all and may have some thoughts on this as well. 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?? Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. My question on a 2007 Chevy Tahoe 5.3 AFM [] 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. What the biggest reported problem with Chevy Silverados? Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. They layed over night in engine oil before instalation. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. I can literally drive from Seattle to Redding CA on one tank. 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? One the other hand, it came without AFM, VVT, or flex fuel capability. Then it takes out the lifter again and again until you bite the bullet and replace the cam. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Ive been reading, with disgust and concern of the lifter/cam situation. Should I wait until the warranty runs out, or will that be too late to stop possible damage? 2011 Chevy Avalanche LTZ. It replaces the AFM components with standard parts. 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. I have no clue what to do now. Billy, there is some interesting trivia here on the L92. 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. Fouls those plugs. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. I know I felt the same way. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Is this due to the AFM being shut off? I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 330-630-0240. Some drivers want V8 power under their foot at all times. It does seem that when they start goingthey go quickly. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I have the towing package on my 13 Tahoe LTZ. 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 had the same issue and had to have the AFM information deleted from the computer and the car tuned. Corvette that does employ AFM. I have a 2014 Silverado with a 5-3. Welcome to socialism folks . AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. It has 8,000 miles on it. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. 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. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. No other V-8 truck of similar weight can do that (except another GM with AFM). It uses a M14 x 1.5 thread plug like Dorman 65217. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Only running on drivers side cylinders. I have an 07 Yukon with 230k on the engine. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? i just bought a 2018 Silverado with the 5.3 Lost number four Any guidance would surely be appreciated. The engine will switch to operating on fewer cylinders when cruising at a constant speed. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. [], I have a 2012 Silverado Z71 bought new. Have not had a problem yet. AFM Sucks!!! Thankfull for any ideeas! Everything else looked good. Because I want to. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. The exhaust valve remains open during the intake stroke and closes just before BDC. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. With the nipple, or without? Last GM Ill ever buy unless its got a diesel. I got the AMF disabler anyway and so far so good. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. 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. This is what I keep telling people. im going to plug in a dissabler when im done to keep it V8 mode all the time. 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. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. I have a 12 wit 4.8 Silverado 75000 miles Friend will send to me from Arizona. NOT GOOD!! []. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Do you think I can still disable AFM? [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. $8500.00 fix. 4,7 plugs foul runs rough at idle. Help appreciated. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. No problems with any to this point. I told her to never pull the gadget out. The engine has flex-fuel capability. also in the pan is another AFM oil filter near the external engine oil filter. This lowers the cost of building it [], [] aluminum block engine. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. 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. Most of the complaints show up in the 2009 to 2011 model years. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Is this an issue only with GM SUVs and trucks, or does it include cars too? Wed recommend a call to our partners at Summit Racing. It actavated the lifter? They have plastic casing, so you can imagine what will happen with aged plastic. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Truck ran fine before that. The only solution is to replace the entire cylinder head. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. 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. . Replaced all lifters. My 5.3 is. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. A 17 with 5.3. 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. I read something the other day which I found to be funny. On the AFM lifters that dosnt work i have installed them With the oil hole Down! Get this, rebuild is only rings and maybe lifters. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Number 7 cylinder lifters stops moving when truck starts. Just one. My 5.3 has a vin code of O. Just pulled it down in the garage there was no other damage , luckily. Will the plug in deactivater fix the oil consumption or will it cause more consumption? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. GM should recall every vehicle with this terrible design flaw! HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. It will show up as a misfire code in a cylinders 1,4,6, or 7. 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. What makes you think it was a design flaw ? Put everything back together proper torque, gakets, valve seals, etc. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. 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? Now you tell me AFM works and I will tell you; that you are full of shit! 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. It was well researched and tested back in the late seventies and eighties . I ave noticed the point about excess oil spray. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. .or something similar . I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. I asume low oil pressure cant make some of the DOD lifters to malfunction? I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. 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. I have successfully used a gadget that plugs into the ODBII. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. (Non-AFM engines have a smooth cover.). I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? It works . In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Love the truck so far. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. It is being covered under warranty since I only have 72,000 miles on it. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. My Wifes 17 Buick with afm was my attempt to get back to gm. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Driver reported this occurred suddenly while driving down the highway. 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. I have a shop 39 yrs . There are no changes in the valves or the springs. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. There may be an ignition related issue on that cylinder. 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. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. This happened on a camping trip with my kids last friday night. There is a good chance that some of the drivers side lifters decided to go. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Ketil, let us know what you find out. Why would GM ever produce such problems with such little to gain. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Most of all, my concern is reliability. Double digit MPGs in my 98 K1500 would be a dream lmao. Most will want to get rid of the AFM immediately and VVT isnt for []. Thank you again for the response. Its Chrysler and Ford. Engine oil pressure is fine. Any advice that you could offer would be great. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Thanks for the detailed post! GM offers the following diagnostic steps in determining if this is the problem. 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? Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I have a 2013 1500 with the LC9. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Is there any reaction to the disabler when pulling a boat or trailer? so the trans fluid worked for you then? I am having that done today on my 08 Suburban and its only costing me $225. She started to have the lifter problem again after 60,000 miles more. The Jury is still out on the Gen. 5s but the warranty could be an issue. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. How is that an improvement. Todays computers are faster so it does work. This is in response to pretty much everyone. We chickened out though and just bolted the AFM solenoid plate onto the used engine. 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 had privilege to work on some of that garbage they never did work . GM claims fuel improvements ranging from 5%-15% depending on the engine. He stated if I continued to exceed 4500 RPM it would blow the lifters out.