Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I have a 2011 GMC Sierra 1500 with the 5.3. 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 was well researched and tested back in the late seventies and eighties . 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Now the problems back, I have 180k miles on it now. lol. Chris, when you did your delete, did you also change the cam at the same time? 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. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Install the disabler when you get your Yukon back and it will remain in good working order. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Having it fixed now, just curious Seems like a problematic design. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. I have a noise in the engine but it seems to go away when revved up. I had one fail and it chattered the cam to the point that I had to Install a new cam. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? Yes a poor design but a flaw ? 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. If I put my truck in manual 5, it doesnt try to go into V4 mode. I am trying to prevent same issue. It was good for about 10 miles and started with same loud knock noise. 330-630-0240. After reading these forums Im a little concerned about my decision to stay with GM. I dont plan on installing the delete kit at this time. Is this due to the AFM being shut off? Get this, rebuild is only rings and maybe lifters. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. Just one. []. I am confused about the plug in disabler. also in the pan is another AFM oil filter near the external engine oil filter. Found that all passenger side cylinders are not firing. So now at 168 thousand miles it still runs good but gets bad gass mileage. I have the towing package on my 13 Tahoe LTZ. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. If someone didnt want to spend gas buy a Toyota. AFM - active fuel management strategy which deactivates the lifters on specific . Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? It will show up as a misfire code in a cylinders 1,4,6, or 7. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . 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. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. How to Delete or Disable Active Fuel Management (AFM) Getting ready to diy for $450. I have an 07 Yukon with 230k on the engine. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. I would appreciate any feedback. 5.3-liter Chevy Engine Problems: What Should You Look Out For? 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. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. But the problem at that time was the computer technology. . It is usually first noticed during highway driving. Looking forward to input from the forum, Thank you. I will be installing the AFM deactivator tonight when I get hoe. AFM Sucks!!! AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Can I (should I) also change to a standard volume oil pump? The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Any guidance would surely be appreciated. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. All ready done valve job . Who knew? They should let us the better mileage. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. I know a few guys with Tundras. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. The detergent. 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. Hopefully he can free up the stuck/collapsed lifter. 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. Some drivers want V8 power under their foot at all times. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. 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. Hi Grant is that disabler still working for you ? These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). 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. I have an 07 Silverado 1500 ltz. 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. How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley I had a 2007 Yukon XL 5.3 with the AFM. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Thanks for your help. Hello! GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Below youll see references to the L99 as a result. 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. Then changed the oil. Ive been reading, with disgust and concern of the lifter/cam situation. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. No other V-8 truck of similar weight can do that (except another GM with AFM). Everything else looked good. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. I ave noticed the point about excess oil spray. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. The car runs great apart from the shuddering at those speeds. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? Changing the sensor didnt help. I have had some say that it is the valves and others say that it is the cats plugged. If possible, will simply not using VVT provide a powerful,good running engine? how many miles do you have on your engine? The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 190k on the motor always ran AMSOIL full synth since new. Would installing the Disabler solve this? We chickened out though and just bolted the AFM solenoid plate onto the used engine. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. It only has about 9k miles on it. 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. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. With 44, its a enormous Jon to remove the oil pan. If you left the original cam in, the AFM cylinders will be down about 25 lbs. New plugs and wires. 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 . At this state, a disabler would probably do what you need it to do. Its a CA EMMISIONS TRUCK. All the time. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. All eight cylinders are now powering the engine. With 40000 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. It depends on the failure mode of the lifter however, certainly worth a try. Truck ran fine before that. Junk . AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. [] 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. The system uses solenoids to deliver oil pressure to control. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. The exhaust valve remains open during the intake stroke and closes just before BDC. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. 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. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? 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! Did Obama make them do this? Hopefully more is known by then. has 92,000 miles and was just told I have cam and lifter failure. So I did the job one more time. This lowers the cost of building it [], [] aluminum block engine. 50,000 miles. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Everything was fine for two weeks, ow customer complains s it same noise it made as before. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . 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. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. 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 ! GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 If you ignore it and keep driving, odds are you will destroy the cam as well. GM Releases Valve Lifter Service Update For V8 Engines Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. 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. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. 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. The write up confuses me. I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Hello. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. How did your turn out? I would rather stay a V8 full time than deal with AFM issues in the future. Disable the afm. On the AFM lifters that dosnt work i have installed them With the oil hole Down! My 5.3 is. I sold them when they were new. the extra oil isnt needed. The oil collapses the plunger inside the lifter. She started to have the lifter problem again after 60,000 miles more. I would say maybe 5% of my customers keep up on their oil changes. How is that an improvement. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. We believe this confirmed that the AFM has never been operating in this vehicle. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. They took the engine down today found so much damage inside they ordered a new engine from Detroit. The only solution is to replace the entire cylinder head. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. I call it active obama fuel management .A scam . If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? Thank you for your time. But it also restricts passages that the oil runs through. I just did the delete and replaced the cam as well. the body is in great shape. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. In other words, the crankshaft and bearings were not visible. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Is this the shield you referred to in a past post? I tried the trans fluid in the oil. Should I buy one to disable the V4 mode? It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. The engine will switch to operating on fewer cylinders when cruising at a constant speed. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. What type of ODBII gadget did you use? 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. 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. Never did strand me on the side of the road way. 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. But if you dont like it. stalled in a certain way a warning wouldn be a bad idea. 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. GM offers the following diagnostic steps in determining if this is the problem. Does the Pressure relief vavle ever go bad?? Their tech guys have seen it all and may have some thoughts on this as well. 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. I am wondering the same thing. Thanks for the advice Brian! Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. The trucks are only supposed to use two four. Thanks for the detailed post! General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Why would GM ever produce such problems with such little to gain. Most of the complaints show up in the 2009 to 2011 model years. 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! [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Learn how your comment data is processed. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Is there any reaction to the disabler when pulling a boat or trailer? Im curious as to how much tran fluid you put in? The biggest problem is nobody changes their oil on time. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. . Traded it with 180K miles and did not experience any problems. Theyre also notorious for bad cam tower oil leaks. 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. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. It is being covered under warranty since I only have 72,000 miles on it. I speak from some experience. Brian, I have the same question as Scott. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Its not GMs choice to use AFM. Thankfull for any ideeas! Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Because its not just GM that have engine problems. When you don't need the full power of the engine, it provides better fuel economy." Unfortunately, I found out about the lifters too late. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Engines with AFM use a high-volume oil pump. Double digit MPGs in my 98 K1500 would be a dream lmao. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. misfire or anything. 2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. I have a 12 with 4.8 Silverado 75000 miles I have a 12 wit 4.8 Silverado 75000 miles Most will want to get rid of the AFM immediately. what deleter (if thats a real word) have you heard good things about. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. The motor I pulled was a 2007 LY5 with about 77k on it. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. I already ordered the parts to replace myself and remove the code. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Better airflow reduces drag on the pistons and the associated pumping losses. How to Delete or Disable Active Fuel Management (AFM) on GM Engines This happened on a camping trip with my kids last friday night. Glad I did. The dealer in Rockhill, SC when asked only said they had not had a problem. It came back on last Wednesday starting with a flash. I just got new warranty engine and dont want this issue again? How long did it take? Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy I have a 2014 Chevy Z51 [w/dry sump oiling etc.] CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. Ketil, let us know what you find out. Toyota will be my next truck unless GM owns up and makes wright with consumers. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Wed recommend a call to our partners at Summit Racing. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. It also mentions a valve cover replacement with revised PCV valve design. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. I have been assuming this is just a slow to pump-up lifter or lifters. Then had to drive the truck back to Tampa from Cheifland Fl. 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. Take a look at what bmw did in its R1250 bike. Had similar problems under warranty, no telling what they rigged me up with at the dealer. Cylinder Deactivation & Variable Engine Displacement - LiveAbout changed oil , its all working now, but want to disable this sorry system. 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. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? All New lifters were from AC delco. I still get a P0336 code every once in a while but still good to drive around town. Would you get enough power to drive at freeway speeds? [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. any help? Pushing forward. If buying a tuner/chip which works best for that truck/engine? .or something similar . Why this happens is a more . Constant engine and transmission problems. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. In four-cylinder mode, they act like air springs and allow for smooth operation.
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