There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. Replace the cam or do the delete kit? Number 7 cylinder lifters stops moving when truck starts. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. . When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Last GM Ill ever buy unless its got a diesel. Better airflow reduces drag on the pistons and the associated pumping losses. What the biggest reported problem with Chevy Silverados? Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. [], [] as the LS engine familys hybrid engine in trucks and SUVs. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. However, they are only functional on engines that usedAFM. I dont know where to being to look for the problem. 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. It has 8,000 miles on it. Welcome to socialism folks . It depends on the failure mode of the lifter however, certainly worth a try. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. Have not had a problem yet. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. 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. Install the disabler when you get your Yukon back and it will remain in good working order. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. What type of disabler did you go with? a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! Hello! 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. 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. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. It has has 9000 miles and no lifter or other issues or codes so far. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. This basically deactivates the cylinder deactivation system. hi brian when you replace the lifters do you have to change the guides also? Replaced all lifters on passenger side as well as pushrods for even wear. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. They layed over night in engine oil before instalation. Open to suggestions about best course of action. The collapsed lifters will not engage the pushrods and both valves remain closed. misfire or anything. I had a 2007 Yukon XL 5.3 with the AFM. 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. Why would GM ever produce such problems with such little to gain. 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. There is a good chance that some of the drivers side lifters decided to go. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Change your oil. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I couldnt agree with you less, yet I respect your opinions. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. There are so many moving components in an engine these days as opposed to the past. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Sylinder one lost compression on my 09 5,3. These trucks cost too much to have a terrible product. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Below youll see references to the L99 as a result. It came back on last Wednesday starting with a flash. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. It will show up as a misfire code in a cylinders 1,4,6, or 7. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. This is in response to pretty much everyone. The detergent. 1. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. . It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? Thanks for the advice Brian! We believe this confirmed that the AFM has never been operating in this vehicle. Why this happens is a more . Cost about $250, but it is not fool proof. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. 190k on the motor always ran AMSOIL full synth since new. I was getting ~ 30 mpg, so I love that. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Can they be faulty? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. I know I felt the same way. But after reading this thread, Im a little concerned about the long-term reliability. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . 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 ! I am wondering the same thing. Get this, rebuild is only rings and maybe lifters. [] they have a downside? Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? When you eliminate the AFM system, the extra oil is no longer needed. Also putting in a new transmission vs. rebuilding. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. How do you know if the lifter has failed? The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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. it is the regulator guy! [], [] LS Tech: How to Delete VVT or DisableAFM []. 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 engine also had 799 or 243 casting heads which are closely related to the LS6. Im praying that my RangeTech buys me a few years. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. She drove it for another 35,000 and it went out again. 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. Theyre also notorious for bad cam tower oil leaks. 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? Its not possible to install them wrong? TheAFMcylinders are opposite of one another in the firing order. 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. Not sure what else it can be. You may want to update your post. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Covers me to 100K. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. Told her that it would not last and that she needed to find a different way to get around. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Billy, there is some interesting trivia here on the L92. 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. The biggest problem is nobody changes their oil on time. Im confused from the write up about the plug in. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. I will keep reading and take notes. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? 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. 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. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. I loved this rtuck until this happened!! Diablo says yes but they do not provide tunes. Whats the next step? 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. Ketil, let us know what you find out. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Im always sorry to hear when people run into issues like these. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. I guess I might have to call a dealership or GM to get a definite answer on this one. Is there any potential down-side to doing this in other words, might this do more harm than good? NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. 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? So for all of you that continue to complain about how bad these things are. Just shut AFM off. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Thanks for your help. []. I can literally drive from Seattle to Redding CA on one tank. I ordered a electronic disabler for it today. If so what would the vin code be? The engine will switch to operating on fewer cylinders when cruising at a constant speed. I have a noise in the engine but it seems to go away when revved 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. 2011 Chevy Avalanche LTZ. This really sucks. Now the problems back, I have 180k miles on it now. Some drivers want V8 power under their foot at all times. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? All eight cylinders are now powering the engine. I had to replace them all and the camshaft as well. I had privilege to work on some of that garbage they never did work . I am trying to prevent same issue. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Because I want to. Teflon coatings does not last. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. How long did it take? Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. If I put my truck in manual 5, it doesnt try to go into V4 mode. 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? Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. . I have no other engine problems and Id like to fix the issue. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. is it still working good since you have done that with the trans fluid? This new lawsuit is essentially identical to the previous. We were getting a code that the cam position sensor was not functioning properly. If buying a tuner/chip which works best for that truck/engine? Its a CA EMMISIONS TRUCK. Thank you. I cant really tell from driving. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). New plugs and wires. Brian, thank you for the quick response. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. This should be added to your earlier model if you experience oil consumption. Install an AFM Delete Kit According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. I have read synthetic isnt good for AFM lifters. I recently bought a low mileage 2013 Silverado and the lifters collapsed. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. If the 4th cylinder lifter has failed, would driving it damage the engine? 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. Pulled right valve cover an rockers on syl 6 dont move. Replaced all 16 lifters due to collapsed lifter on CYl #4. 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. Next day, fired it up to take the the junk yard and it ran great. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. Yeh truck has 5237 miles on it Corvette that does employ AFM. It is usually first noticed during highway driving. Any help would be appreciated. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. [] 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. This system was originally used in early 1980s Cadillacs. Brian, I have been reading your article about the AFM. lol. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Not sure which direction to go from here. Most will want to get rid of the AFM immediately and VVT isnt for []. I have an 07 Yukon with over 180K. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Its ribbed with solenoids on the underside. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). 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. 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. Found that all passenger side cylinders are not firing. I havent has any lifter or cam issues. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. They dont so any better than domestics on mpgs. Thank you for your time. Thanks. Learn how your comment data is processed. I still get a P0336 code every once in a while but still good to drive around town. 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. 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. What type of ODBII gadget did you use? That inherently less smooth operation requires additional NVH dampening. The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. how many miles do you have on your engine? Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Engine oil pressure is fine. 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. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Would installing the Disabler solve this? With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. has 92,000 miles and was just told I have cam and lifter failure. Did not help. 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. My question is: do I install the electronic disabler on the new engine to avoid future issues? thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. With 44, its a enormous Jon to remove the oil pan. 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. 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. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. The engine is running on only four cylinders. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. .or something similar . Glad I did. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. I just got new warranty engine and dont want this issue again? As you said, the ECM was never seeing the AFM so I think youre good to go. Ive only put a straight pipe exhaust, intake, and a boost controller on it. I am confused about the plug in disabler. It has plenty of oil pressure and I put all new lifters in it. At this state, a disabler would probably do what you need it to do. Junk . Call chevy.They should being paying most of that. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Having a hard time finding one .. Hopefully he can free up the stuck/collapsed lifter. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. I have a 07 Yukon with 180K and no issues what so ever. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Our 2013 yukon with 47k miles just failed. Should I wait until the warranty runs out, or will that be too late to stop possible damage? From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. []. 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. Chris, when you did your delete, did you also change the cam at the same time? Now you tell me AFM works and I will tell you; that you are full of shit! It is also known as Displacement on Demand (DoD) or cylinder deactivation. 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? Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? please respond with your opinion. It also has an electrical connector on the back. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. 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. If you just crack it without it starting it moves all the time . So I researched and got an AFM disabler. How about if they just let us have a manual transmission agains for fuel mileage? 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.
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