If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. hi brian when you replace the lifters do you have to change the guides also? It prevents the computer from switching over to four-cylinder mode. If you just crack it without it starting it moves all the time . Any thoughts or suggestions would be appreciated. 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? Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in They have plastic casing, so you can imagine what will happen with aged plastic. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? This happened on a camping trip with my kids last friday night. 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 got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Required fields are marked *. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. Does cylinder deactivation affect engine life? - Quora Replacing engine due to issues caused by AFM. The most common issue GM vehicle owners with AFM report is increased fuel consumption. If the 4th cylinder lifter has failed, would driving it damage the engine? Runs better than new now and no more oil consumpsion!! Was a disaster then but a profitable disaster. No it runs fine on sylinder one but not on 6 or 7!!! This is what I keep telling people. Have there been improvements in more recent model years employing AFM [2014 or newer]? It has AMF. No problems with any to this point. This new lawsuit is essentially identical to the previous. Didnt change exhaust nor tune so likely no change in power/torque. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. Most will want to get rid of the AFM immediately and VVT isnt for []. Cant believe they havent fixed this in a decade. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. Then changed the oil. Have not had a problem yet. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Its a CA EMMISIONS TRUCK. It essentially turns your V8 engine into a V4 which saves fuel. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I have 217,000+ on it and it never fails meever! Would it be fine to go ahead with the AFM Disabler? All New lifters were from AC delco. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. 5.3-liter Chevy Engine Problems: What Should You Look Out For? 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? Thanks. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] put tran fluid in oil for a day till lifter became active, had to change the fouled plug. What type of disabler did you go with? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. Junk . What would you do if you were in my situation? Thanks for the advice Brian! The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Should I wait until the warranty runs out, or will that be too late to stop possible damage? Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. 1. 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. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Pulled the inntake and replaced valleypan With all the solenoids. With 40000 I ran 0W-20 on more the 5000 miles between changes. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . 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. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Once I get it back, could I install the Disabler safely. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. It will show up as a misfire code in a cylinders 1,4,6, or 7. Should I buy one to disable the V4 mode? Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. 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. My fear now is not will it happen but when! 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. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). changed oil , its all working now, but want to disable this sorry system. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! GM claims fuel improvements ranging from 5%-15% depending on the engine. I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! If you ignore it and keep driving, odds are you will destroy the cam as well. Wed recommend a call to our partners at Summit Racing. Last GM Ill ever buy unless its got a diesel. It came back on last Wednesday starting with a flash. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. another common cause for low OP is the oil pick up tube O ring. It does seem that when they start goingthey go quickly. Is this due to the AFM being shut off? Truck has an active P0300 code and runs very rough. 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. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? I cant really tell from driving. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Disable the afm. Now Im here tring to figure out what to do. There are so many moving components in an engine these days as opposed to the past. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. I only had 81k on the motor. Ketil, let us know what you find out. 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? Our 2013 yukon with 47k miles just failed. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. With 40000 Is this an issue only with GM SUVs and trucks, or does it include cars too? So for all of you that continue to complain about how bad these things are. bought at Brian Tooley Racing ! . . Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I am trying to find out of this is true. how many miles do you have on your engine? This is my project car and will be my drive (about 5000 miles a year). We need availability of a replacement engine without the AFM. Do not pay that amount. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? Your email address will not be published. Glad I did. The detergent. Hi. Your email address will not be published. We were getting a code that the cam position sensor was not functioning properly. I guess I might have to call a dealership or GM to get a definite answer on this one. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. I have a 07 Yukon with 180K and no issues what so ever. []. A tuner can often fix that as well by giving it some more ignition advance in these regions. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Changing the sensor didnt help. is it still working good since you have done that with the trans fluid? I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Because its not just GM that have engine problems. $8500.00 fix. What the biggest reported problem with Chevy Silverados? Mine did at the exact same time. Only running on drivers side cylinders. Open to suggestions about best course of action. 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. Accept i only have 60K on my truck and it hasnt recovered. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? 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. Dont drive it if you have a dead cylinder due to afm failure. The write up confuses me. Looking forward to input from the forum, Thank you. Hello. Lost number four Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. I went with the new motor for the warranty. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). But if you dont like it. They layed over night in engine oil before instalation. It is replaceable.. just remove oil pan and it will be on top at the filter. GM should recall every vehicle with this terrible design flaw! I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! Its ribbed with solenoids on the underside. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Thanks. It uses a M14 x 1.5 thread plug like Dorman 65217. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. More information can be found in the GM TSB bulletin number 10-06-01-008g. 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. 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. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. If someone didnt want to spend gas buy a Toyota. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Thankfull for any ideeas! AFMlifters have a history of failing and oil consumption can be a problem. How to Delete or Disable Active Fuel Management (AFM) on GM Engines Better airflow reduces drag on the pistons and the associated pumping losses. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. You could also have tried that if the trans oil didnt work. 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. Ive only put a straight pipe exhaust, intake, and a boost controller on it. Chevrolet 5.3 Engine Issues and Recommendations Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. After reading these forums Im a little concerned about my decision to stay with GM. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Where can I buy a bolt to replace this relief valve ?? I have been assuming this is just a slow to pump-up lifter or lifters. Is the Pressure relief valve replaceable? Constant engine and transmission problems. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . will feel like a jerk asking the clerk at lowes to cut them again. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. What Is Hemi MDS? - MotorTrend A 17 with 5.3. The 5 Most Common Chevy EcoTec3 5.3L Engine Problems It was well researched and tested back in the late seventies and eighties . (Bought car 1 day before lifter died!) Hopefully he can free up the stuck/collapsed lifter. I love the car so far. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 2011 Chevy Avalanche LTZ. We believe this confirmed that the AFM has never been operating in this vehicle. 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 can I expect with the AFM in place, or, with AFM disabled (not deleted)? The oil is baked on to every component. they are known to become plugged. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. Replaced all 16 lifters due to collapsed lifter on CYl #4. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. How to Fix GM's Cylinder Deactivation Problems I have a 12 wit 4.8 Silverado 75000 miles Drives way better for my mostly paved road driving. There is a chance the cam lobe was stressed and started to deteriorate. It has has 9000 miles and no lifter or other issues or codes so far. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. My 5.3 has a vin code of O. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. It has the orings in place, that seals the towers. My 2002 I had over 298K on it with no engine related issues. 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. Clean oil is crucial. misfire or anything. Not sure which direction to go from here. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. Everything else looked good. I am confused about the plug in disabler. []. Im curious as to how much tran fluid you put in? This should be added to your earlier model if you experience oil consumption. You may want to update your post. any help? 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. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Friend will send to me from Arizona. "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. I had to replace them all and the camshaft as well. The original version sprayed oil on the cylinder walls and increased oil consumption. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? I have no clue what to do now. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit Fortunately I received a reducing in house shop hourly rate. I have successfully used a gadget that plugs into the ODBII. Are you saying that I am in the clear by a year and issues fixed? Does the Pressure relief vavle ever go bad?? Their tech guys have seen it all and may have some thoughts on this as well. Once the lifter has been damaged, the cam is probably also damaged. What type of ODBII gadget did you use? The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. I have no other engine problems and Id like to fix the issue. I have a 12 with 4.8 Silverado 75000 miles 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 bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Nine plaintiffs filed the General . The valve itself is part number W0133-2574213. If you left the original cam in, the AFM cylinders will be down about 25 lbs. GM switched over to the 4100 v-8 in 1982. Any guidance would surely be appreciated. The biggest problem is nobody changes their oil on time. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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. This is my second Avalanche and I never had any issues with either of them. I will keep reading and take notes. stalled in a certain way a warning wouldn be a bad idea. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. The system uses solenoids to deliver oil pressure to control. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. 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. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. I hate it. One must anticipate this. The Jury is still out on the Gen. 5s but the warranty could be an issue. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. It works . A 14 gmc 5.3 Sierra 85000 miles the extra oil isnt needed. 190k on the motor always ran AMSOIL full synth since new. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Chris, when you did your delete, did you also change the cam at the same time? 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. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. .IMHO . Learn how your comment data is processed. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Change your oil. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Some drivers want V8 power under their foot at all times. Carbon Build-Up in the Intake Ports. Fouls those plugs. Thank you. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Engine starts but is throwing a misfire on cyls 4,7. 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. Brian, I have been reading your article about the AFM. But it also restricts passages that the oil runs through. If the lifter actually fails so that the mechanism wont release, it wont work. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Have a lifter problem on my 2010 5.3 Silverado. 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. Ill Never Ever buy another gm. Very expensive repair too! I just got new warranty engine and dont want this issue again? Im always sorry to hear when people run into issues like these. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC Don't even get me started on the shortened life of the cooling, starting and charging systems. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Yes thats true. I am wondering the same thing. 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. 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. 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". In other words, the crankshaft and bearings were not visible. Now you tell me AFM works and I will tell you; that you are full of shit! [] they have a downside? 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. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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 am having that done today on my 08 Suburban and its only costing me $225. How long did it take? (Non-AFM engines have a smooth cover.). I am hoping this does the trick. 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. Can you tell me what needs to be done with the VVT? However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. 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. I had one fail and it chattered the cam to the point that I had to Install a new cam. 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. 1981 Cadillac V 864. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes As you said, the ECM was never seeing the AFM so I think youre good to go. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. 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. Then I guess I have to spend a bunch of money and get the delete kit. 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. Welcome to socialism folks . Cylinder deactivation | GM Truck Club Forum I have a 2011 GMC Sierra 1500 with the 5.3. 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. Fortunately, the old engine hadnt been shipped back to the remanufacturer.