THERE IS A LOT OF IMPORTANT/TECHNICAL INFORMATION ABOUT AFM HERE, PLEASE READ IT ALL. I GET EMAIL AND CALLS DAILY WITH QUESTIONS THAT ARE COVERED HERE!!!
Last updated 12-11-2018 : Holiday shipping season is in full swing! I'm already seeing delays on USPS deliveries due to busy holiday shipping. Expect up to a week each direction shipping. Be sure package is marked "AFM" on the outside of the box to avoid a 3-4 day turn around time once its here!
If you have found this page you may be experiencing issues with your 2007-2013 GM Truck or SUV/Car that has the active fuel management, or sometimes called DOD (Displacement on Demand) This is the system that shuts down half the lifters in the engine and places it in a 4 cylinder operation mode. While this idea to shut down cylinders to reduce fuel consumption sounded great on paper, it has also been causing a lot of issues for people. Some of the issues observed deal with oil consumption, fouled spark plugs, and in some cases failed lifters, and repeat failures of lifters. Repair process gets expensive due to requirement of removing the cylinder heads to replace lifters. There are options to mechanically delete AFM from your engine when failure happens. (programming ECM required) To learn about that continue to read below. As a preventive measure you can have AFM disabled in your ECM programming, which is a service I offer. If you decide a replacement engine is a better option for you, Jasper Engines & Transmissions now offers an engine for you without the AFM components. (ECM MUST BE PROGRAMMED) If you bought a Jasper Engine, Click Here!
ALL VEHICLE WITH ACTIVE FUEL MANAGEMENT NOW $50.00 for AFM delete programming, with USPS Priority Mail return shipping included in the price!
$25 additional for Express 1-2 Day shipping
$25 additional if your PCM requires VIN programming before AFM Delete. (new pcm or from different vehicle)
The programming for preventive measure on your stock engine that currently runs fine, and the programming for a mechanically deleted engine ARE THE SAME. Devices such as the Range Technology AFM Disabler, DiabloSport AFM Disabler and hand held programmers, such as Superchips, Hypertech, may allow you to disable AFM on a completely stock engine, but these devices WILL NOT disable diagnostic codes for AFM. If you do a mechanical AFM delete, these devices WILL NOT WORK. ECM Must be programmed with laptop based tuning software, such as service I offer below.
These are for USA Address only. If you are in Canada, or International, contact me prior to purchasing.
PLEASE take the time to read this page, lots of info here, I get a lot of email and phone calls with questions about AFM delete that ARE answered on this page. Thanks. My address and payment info for AFM Delete Service is at bottom of the page, along with my phone number. I have gotten a lot of questions if I was still doing programming, answer is YES, I have not stopped doing programming, nor do I plan to at all. This is my full time job. Thanks, Brendan - 9/12/2018
click here >> VERY IMPORTANT INFORMATION IF YOU HAVE A 2005-2006 TRAIL BLAZER, ENVOY, RAINIER, SAAB 9-7X, IMPALA, MONTE CARLO << click here
I have been working with a few local shops; we have had dozens of trucks in my small town already with repeated lifter failures after replacement with new AFM lifters. The AFM lifters appear to fail two different ways. I have seen the lifter come a apart, causing valves to bend, and have also seen them get stuck in a compressed position, causing valves to stay closed, and pushrod to bounce around unloaded. I believe that the lifter should not fail as soon, or maybe not at all, if you disable the cycling from on to off of the AFM lifter. There are some vehicles where I have seen worn lifter guides, causing the AFM lifter to rotate slightly, and go into deactivated position on its own, also there are issues with the oil control solenoids that leak oil when not commanded, also causing cylinder deactivation.
OIL CONSUMPTION: It is my conclusion that the oil consumption has something to do with a spray or mist of oil created when the lifters exit the cylinder shut down mode and the oil used to compress the lifter is exhausted. This oil sprays on bottom of cylinders and enters the PCV system, drawn into the intake and burned. This means depending on each persons driving style, the more the engine enters/exits 4 cylinder mode, the more oil consumption you may see. This theory is backed up by the presence of oil fouling on spark plugs, which is usually worse on the AFM cylinders, but is present on all 8 cylinders. Some vehicles with 3+ qt consumption in an oil change the AFM delete dropped it by half, and an updated valve cover replacement further dropped the oil consumption. 2007-2010 vehicles there is an updated valve cover with revisions to the baffle/shield under the drivers side valve cover. read this: https://static.nhtsa.gov/odi/tsbs/2012/SB-10062524-7690.pdf GM also has a shield that goes over a valve in the oil pan. This IS NOT needed if AFM is disabled. I have done the AFM delete and the new valve cover on vehicles and completely eliminated oil consumption.
I have programmed hundreds of local trucks to simple disable the AFM. Last year I have programmed over 350 mail order ECM's for people doing hardware deletes using methods I describe here! Most notice almost no difference in fuel economy due to the very tight conditions required to enter 4 cylinder mode. (2014+ direct injected engines may see 1.0 to 1.5 MPG loss when disabling AFM) Oil consumption appears to be eliminated by disabling the AFM system when valve cover was replaced, as would be expected if my above theory is correct. Some vehicles may be too far gone; oil rings already to dirty to come back to life. I have seen a few vehicles that oil use tapered off over a year following AFM delete.
DISABLING THE AFM SYSTEM: If your vehicle is currently running with no mechanical problems; meaning, no misfires due to no compression, no stuck lifters, no loud lifters, I believe simply programming the ECM to disable the AFM activation will prolong the life of the engine, and eliminate oil consumption. If you have experienced a lifter failure, and have a cylinder with zero compression, lifter replacement is now required! I would highly suggest removing the AFM hardware from the engine since you will have the cylinders heads off anyways. !!!PROGRAMMING REQUIRED IF YOU REMOVE THE AFM HARDWARE!!! If you remove the AFM components, and start the engine, DTC P3401, P3425, P3441, P3449 will set. These are codes for the 4 solenoids that control AFM. When these codes set, the PCM will disable the injectors for those cylinders. So the ECM has to be programmed to disable those diagnostic codes. See bottom of this page for programming info. Devices such as the Range Technology AFM Disabler, DiabloSport AFM Disabler and hand held programmers, such as Superchips, Hypertech, may allow you to disable AFM on a completely stock engine, but these devices WILL NOT disable diagnostic codes for AFM. If you do a mechanical AFM delete, these devices WILL NOT WORK. ECM Must be programmed with laptop based tuning software, such as service I offer below.
If you have had a lifter fail and the pushrod/rocker arm is loose, there is a chance you maybe able to free it up. Watch this video below, I have seen this method work locally in two trucks in the first few weeks I knew about this. Programming should still be done to disable AFM, and I would recommend unplugging the electrical connector at back of engine, zip tie the connector so it can't short out on anything. This method could save you some money and time and get you back on the road faster. You need to observe the engine after doing this to make sure no other damage was done to roller on lifter or camshaft. If you stop driving as soon as the lifter sticks, this is a good fix. If someone drove around for a few weeks with lifter stuck, this probably is not the best fix, and complete mechanical would be better.
PARTS NEEDED FOR COMPLETE AFM MECHANICAL DELETE : I recommend Summit Racing for GM Parts. Always in stock I have found, and fast shipping! Any GM dealership should do as well. Amazon/Ebay I don't always trust where the parts are coming from, that's a choice for you.
Head Gaskets GM PART# 12498544 for a PAIR, 2 head gaskets. These are the exact same gaskets you probably removed. Will say 5.3 HO / 5.7 on the gasket its self. 6.0 6.2 should use proper head gaskets for that engine.
Head bolts GM PART# 17800568 Stock GM head bolts, enough for 1 cylinder head, so buy 2 of this part if doing both heads to do the full delete.
Valley Cover Plate - GM Part# 12598832 This will replace the stock valley cover that contains the oil control solenoids responsible for activating AFM. This new valley cover will also block off the 8 oil ports on the block. Should include gaskets. No need to drill & tap the towers, or otherwise seal the towers, this cover does that for you.
Lifters - GM Part# 12499225 Your AFM engine will have 8 standard lifters, and 8 AFM lifters. This part# gets you 16 new standard lifters.
Timing Cover Gasket Set - Fel Pro Part# TCS45993 includes gaskets for timing cover, harmonic balancer seal, water pump, and oil pump pick-up tube o-ring.
Lifter Guides - GM Part # 12595365 These are the plastic guides that keep the lifters from rotating, keeping the roller going correct direction on the cam lobe. These guides are different for AFM lifters, and you will need 4 of these.
Cam Thrust Plate - GM PART# 12589016 This part retains the camshaft in the block and also has an oil seal that is likely flattened out and should be replaced.
CAMSHAFT - The AFM engines have a special camshaft. The mechanism required for the AFM lifters to turn on/off requires the individual lobes of the cam with AFM lifters riding on them to be DIFFERENT than adjacent lobes with standard lifters. You MUST replace the camshaft if you are going to replace the AFM lifters with standard lifters. Failure to do so will result in 4 cylinders that are about 25 lbs low on compression. This WILL cause misfires at idle. (Learned this the hard way, take my word, CHANGE THE CAMSHAFT)
GM PART# 12689035 is the stock camshaft used in the 4.8L/5.3L engine that DID NOT come with AFM. This camshaft is a direct replacement for the 5.3L AFM cam when you want to do the AFM delete and use standard lifters. This cam will have a groove in the 2nd bearing journal that is used to supply oil for use in VVT (variable valve timing) that started in 2010. This cam works just fine in 07-09 WITHOUT VVT, as well as 10+ WITH VVT when deleting AFM from 5.3l engines. This cam will use the stock single bolt timing gear and bolt from the 07+ engines as well. As of this writing, this cam is around $118 brand new from GM, you can also get it on Amazon, Summit Racing, so on. Most all GM parts are on Amazon or Summit Racing. (This cam WILL NOT work for 2005-2006 5.3L Envoy, Denali, Impala SS, Monte Carlo SS or any engine with the E40 ECM those two model years. You must have 3 bolt cam sprocket for those applications.)
GM PART# 12623065. This cam is the factory 6.2L L9H camshaft from non-afm 6.2 in 2009+. Use this for 2007+ applications on 6.0/6.2 when deleting AFM for best matching lobes for the larger engine/heads used on these engines. This cam also uses the stock single bolt timing gear and bolt.
2nd option for camshaft; the cheapest way is to find a used 4.8/5.3/6.0 camshaft from 1999 to 2007 Gen 3 engine that did not have AFM. These can often be had for as cheap as $20 online. There is one small difference. The Gen 3 camshafts use 3 bolts to hold the timing gear on, and the 2007+ use a single large bolt in the center. On the 2007+ engine you must use a cam gear that has a 4x trigger wheel for the camshaft position sensor. GM Part# 12586481 has a 3 bolt flange, and 4x trigger and will do this task and costs about $25.00. The gen 3 camshaft option WILL NOT WORK if you have a 2010+ with VVT. In that case, use the previously listed GM PART# 12625437 camshaft.
3rd option for camshaft, is to purchase an upgraded performance camshaft. If you go this route, such as a COMP cam, you can ask for a Gen 3 cam grind, made on a single bolt core. You need to let them know your intention to remove the AFM lifters, and you need all the intake lobes the same, and all exhaust lobes the same. Some cam manufactures are making camshafts to be used with the AFM lifters, so be sure to get this right... On the 2007+ trucks even the smallest performance camshafts will need a custom tune to get it to run perfect. You need to find a local tuner or dyno shop to talk about options after the cam install.
Camshaft sprocket bolt, for single bolt camshaft. This is a one time use bolt according to GM, its about $4.00 Part# 11561283
2007+ All Vehicles MUST use a 4x cam gear pattern. You can get this gear for a 3 bolt camshaft, or single bolt camshaft. 2010+ will have VVT Cam Phaser.
VVT, Variable Valve Timing - Some vehicles starting in 2007 had VVT, the 6.0L LY6, L76, and 6.2L engine family in the trucks ALL had VVT. Starting in 2010 ALL 4.8/5.3 engines also had VVT. This required a change to the camshaft, which will be a groove in the 2nd bearing journal to supply oil to the VVT control valve located inside the cam bolt on these engines. If you are doing the AFM delete on an engine with VVT, you can decide to keep the VVT, or get rid of it too. Removing VVT will require a new timing cover, cam gear, and cam gear bolt. The camshaft part# 12625437 listed above will work with or without VVT. IF YOU WILL BE DELETING VVT, AND I WILL BE PROGRAMMING YOUR ECM, YOU MUST LET ME KNOW BOTH AFM/VVT WILL BE DELETED, BY DEFAULT, I WILL ONLY DELETE AFM ON ECM'S I RECIEVE.
IF YOU SEND AN ECM TO ME FOR PROGRAMMING PLEASE READ THIS
ECM should be original to the vehicle. If you wish to purchase a spare ECM, and ship it instead, you will have to have security relearned. The ECM you purchase MUST have the exact same Service Number on the white sticker. There is an additional $25 for VIN programming, select service below in the white box. GM Sometimes has new software for your vehicle, including some recalls for emissions. If you take your vehicle in for a recall that involves reprogramming the ECM, they will overwrite the AFM Delete programming I do. This could result in only running on 4 cylinders if you have done a mechanical delete. I can perform the same GM programming and get you the latest GM software for your vin. To see what updates maybe available for your vehicle, click here, enter your VIN, click 'Get CAL ID', Select 'ECM Engine Control Module', click 'Next', and click 'Complete History' This will show all software for your ECM specific to your VIN#. There are 8 modules in your ECM. Some scan tools will display what your current vehicle software is, and you can use this tool to see if updates are available, and what that update is for. If you want this service at time of AFM delete, select it below by clicking in the white box, and choose the option with VIN Program, and select which shipping option you want. Please note, an ecm which is programmed with NEW GM software, may require a relearn procedure once you get it back in and running. If you get P0315 code, this will mean you need to have a "crankshaft position sensor variation lean" procedure done with a scan tool. This code will not cause any poor running or issue, but will prevent ECM from detecting misfires until the relearn is completed.
IF YOU HAVE A 2005 or 2006 TRAILBLAZER, ENVOY, RAINIER, OR SAAB 9-7X with the LH6 5.3L, Impala SS, Monte Carlo SS with LS4 5.3L, you have an E40 ECM, and your engine uses a different cam and crank trigger as 2007+ and later engines. You will have a 3 bolt camshaft, so using the NEW camshaft part# I list above is not going to work for you. You should find a used 99-07 LM7/LM4 or L33 camshaft. 2007+ Trailblazer, Envoy, Saab programming on E67 ECM is same as 07+ pickup.
I also $50 AFM delete on 2007-2008 3.9L LZ8 V6 Impala applications. These use the E38 ECM same that is used in the pickup trucks 07-13. The 3.9L could come with or without AFM, so sometimes if a shop installs the wrong engine, AFM must be disabled for engine to run correctly. I have also programmed so shops could put a different 3.9L or even the smaller 3.5L in place of the 3.9L and disable AFM. This seems to work well too.
PREVENT DAMAGE TO YOUR ECM WHEN REMOVING CONNECTORS PLEASE VIEW THIS DOCUMENT. PDF FILE.
7227 Private Road 1830
West Plains, MO 65775
If you mark the outside of the box with black marker in big letters AFM, and ship it to me USPS, I often will program, and ship back out the SAME DAY! Be sure payment is included inside the box, or made prior to me receiving the ECM for the quickest turn around time. Any questions on this call me, 417-257-0014 DO NOT SEND ECM BRACKET, ECM ONLY, REMOVE FROM THE BRACKET
click here >> VERY IMPORTANT INFORMATION IF YOU HAVE A 2005-2006 TRAIL BLAZER, ENVOY, RAINIER, SAAB 9-7X, IMPALA, MONTE CARLO << click here
E-Mail with questions: firstname.lastname@example.org
Holiday shipping season is in full swing! I'm already seeing delays on USPS deliveries due to busy holiday shipping. Expect up to a week each direction shipping. Be sure package is marked "AFM" on the outside of the box to avoid a 3-4 day turn around time once its here!