My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. All these comments on the 5.3 are blowing my mind!!!. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. The oil is baked on to every component. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. im going to plug in a dissabler when im done to keep it V8 mode all the time. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. 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. 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. AFMengines use special lifters for cylinders 1, 4, 6, and 7. changed oil , its all working now, but want to disable this sorry system. 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. it is the regulator guy! My Wifes 17 Buick with afm was my attempt to get back to gm. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Thats not all bad because it saves the cost of an AFM delete kit. How did your turn out? It is usually first noticed during highway driving. We were getting a code that the cam position sensor was not functioning properly. My fear now is not will it happen but when! I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Cant believe they havent fixed this in a decade. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Now the problems back, I have 180k miles on it now. Fouls those plugs. Nine plaintiffs filed the General . It has 8,000 miles on it. 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. Pulled the inntake and replaced valleypan With all the solenoids. AFM - active fuel management strategy which deactivates the lifters on specific . On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. 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. I will keep reading and take notes. They have plastic casing, so you can imagine what will happen with aged plastic. Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Would installing the Disabler solve this? AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. I have a 12 with 4.8 Silverado 75000 miles Disable the afm. Cost about $250, but it is not fool proof. 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. How is that an improvement. But the problem at that time was the computer technology. Below youll see references to the L99 as a result. 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 ! So I did the job one more time. Not sure which direction to go from here. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. It only has about 9k miles on it. Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris. 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. They layed over night in engine oil before instalation. 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. "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. I had a 2007 Yukon XL 5.3 with the AFM. With 40000 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. All eight cylinders are now powering the engine. Our 2013 yukon with 47k miles just failed. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Replaced all lifters on passenger side as well as pushrods for even wear. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Hopefully more is known by then. 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. I know I felt the same way. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Brian, I have the same question as Scott. The valve itself is part number W0133-2574213. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. At this state, a disabler would probably do what you need it to do. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. The 2nd went with a conventional valvetrain. Only thing I noticed with the oil consumption issue. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. It is also known as Displacement on Demand (DoD) or cylinder deactivation. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Have there been improvements in more recent model years employing AFM [2014 or newer]? My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. 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. How do you know if the lifter has failed? Have a lifter problem on my 2010 5.3 Silverado. Would you get enough power to drive at freeway speeds? I will be installing the AFM deactivator tonight when I get hoe. I would just have the AFM disabled (tuned out) then. This is my second Avalanche and I never had any issues with either of them. Im crossing my fingers it does the trick! Call chevy.They should being paying most of that. []. When they are locked into position, they wont wear further and cause issues down the road. I couldnt agree with you less, yet I respect your opinions. Most will want to get rid of the AFM immediately and VVT isnt for []. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 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? 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. GM get a clue! As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. It has the orings in place, that seals the towers. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. I am trying to prevent same issue. 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. 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? The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5). My 5.3 has a vin code of O. .IMHO . TheAFMcylinders are opposite of one another in the firing order. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I can literally drive from Seattle to Redding CA on one tank. 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. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. I plan on getting a tuner to disable the AFM. Im curious as to how much tran fluid you put in? I only had 81k on the motor. Any problems to watch out for?Did you replace the VLOM? You are correct. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Some drivers want V8 power under their foot at all times. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Junk . This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! If you ignore it and keep driving, odds are you will destroy the cam as well. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . I have no other engine problems and Id like to fix the issue. 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. You will get codes thrown if the afm is physically removed without telling the ECM you did so. We need availability of a replacement engine without the AFM. Do you think I can still disable AFM? Next day, fired it up to take the the junk yard and it ran great. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Thanks for the detailed post! From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? I read something the other day which I found to be funny. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I have had some say that it is the valves and others say that it is the cats plugged. 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. Have misfire code and engine has what I would call a surge while driving. With the nipple, or without? Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. 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. 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? The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. I would appreciate any feedback. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. CHANGE YOUR OIL!!!!! 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 . 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 . But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. 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 have a 2011 GMC with over 162,000 miles on it and it runs great! 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. So now at 168 thousand miles it still runs good but gets bad gass mileage. 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. Truck ran fine before that. In other words, the crankshaft and bearings were not visible. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. what deleter (if thats a real word) have you heard good things about. The biggest problem is nobody changes their oil on time. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. It depends on the failure mode of the lifter however, certainly worth a try. . Any truth to that? Pulled right valve cover an rockers on syl 6 dont move. The engine had 200K miles. Do not pay that amount. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Is this the shield you referred to in a past post? 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. 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. Friend will send to me from Arizona. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. I just did the delete and replaced the cam as well. 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? When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Open to suggestions about best course of action. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Ive only put a straight pipe exhaust, intake, and a boost controller on it. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. 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. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 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. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Love the truck. has 92,000 miles and was just told I have cam and lifter failure. I own a reputable repair shop. I loved this rtuck until this happened!! I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. I got the AMF disabler anyway and so far so good. New plugs and wires. 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. Ive been reading, with disgust and concern of the lifter/cam situation. 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. More information can be found in the GM TSB bulletin number 10-06-01-008g. When you eliminate the AFM system, the extra oil is no longer needed. I had to replace them all and the camshaft as well. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. 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. Then changed the oil. There are so many more oil passages on engines these days. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. I ran 0W-20 on more the 5000 miles between changes. another common cause for low OP is the oil pick up tube O ring. Run it and let it soak overnight. 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 . I am leaning heavily on installing the AFM disabler. Have an intake and Borla exhaust. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. 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. . What would you do if you were in my situation? I am trying to find out of this is true. Thanks for the advice Brian! I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. 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. Regardless of the AFM solenoid being commanded on or off. They lasted one year with big problems. Very expensive repair too! 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 is being covered under warranty since I only have 72,000 miles on it. GM offers the following diagnostic steps in determining if this is the problem. Carbon Build-Up in the Intake Ports. Covers me to 100K. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. Why this happens is a more . Still have no power. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . No it runs fine on sylinder one but not on 6 or 7!!! A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Dod is the biggest failure sence the 8-6-4 caddie in 1981. They dont so any better than domestics on mpgs. Because its not just GM that have engine problems. I have a 2012 Chevy Avalanche. It has has 9000 miles and no lifter or other issues or codes so far. 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. Get this, rebuild is only rings and maybe lifters. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. Now Im here tring to figure out what to do. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Its ribbed with solenoids on the underside. [] they have a downside? We chickened out though and just bolted the AFM solenoid plate onto the used engine. so the trans fluid worked for you then? GM should recall every vehicle with this terrible design flaw! Or not because it is the cast iron block and not he aluminum block? Love the truck so far. Now you tell me AFM works and I will tell you; that you are full of shit! A 17 with 5.3. Since no air can get in or out, four cylinders provide no power. Yes, always change all the lifters at once. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? If so what would the vin code be? Looking to tear down myself. I have been assuming this is just a slow to pump-up lifter or lifters. I quites down to nothing after running for about a minute. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. He used seafoam and changed to synthetic oil. , Production date on the vehicle is 04/2006 oddly enough. My 2002 I had over 298K on it with no engine related issues. Loved the looks and interior and thought a I got a great deal at $6k even. I have an 07 Silverado 1500 ltz. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Thanks. But after reading this thread, Im a little concerned about the long-term reliability. Everything was fine for two weeks, ow customer complains s it same noise it made as before. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. That inherently less smooth operation requires additional NVH dampening. If the 4th cylinder lifter has failed, would driving it damage the engine? 2 15 with 5.3 Sierras both with 100k and On the AFM lifters that dosnt work i have installed them With the oil hole Down! Glad I did. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. 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. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I have an 07 Yukon with 230k on the engine. 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. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). Thank you. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. Any help would be appreciated. Should I buy one to disable the V4 mode? If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? All Cylinders. 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?? I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Brian, thank you for the quick response. Is there any potential down-side to doing this in other words, might this do more harm than good? However, they are only functional on engines that usedAFM. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer.
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