Its Chrysler and Ford. I couldnt agree with you less, yet I respect your opinions. If you are using VVT, you could use the NAL-12612273 (L92) cam. Accept i only have 60K on my truck and it hasnt recovered. Glad I did. Theyre also notorious for bad cam tower oil leaks. 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. The result is improved combustion chamber pressure as the piston approaches top . Took the heads off again. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I told her to never pull the gadget out. Hello. What makes you think it was a design flaw ? My question is: do I install the electronic disabler on the new engine to avoid future issues? I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. Ditto , never buy a throw away vehicle again is my recommendation and my fix . I may just do that Vic. The engine will switch to operating on fewer cylinders when cruising at a constant speed. If you left the original cam in, the AFM cylinders will be down about 25 lbs. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. The detergent. Dod is the biggest failure sence the 8-6-4 caddie in 1981. changed oil , its all working now, but want to disable this sorry system. Its a CA EMMISIONS TRUCK. Basically rebuilt most of the engine while in the vehicle. TheAFMcylinders are opposite of one another in the firing order. 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. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. I just bought a 2018 Silverado. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? Nine plaintiffs filed the General . Cost about $250, but it is not fool proof. Yes thats true. Engine starts but is throwing a misfire on cyls 4,7. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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. 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? I will keep reading and take notes. There may be an ignition related issue on that cylinder. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? 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. AFMlifters have a history of failing and oil consumption can be a problem. Also putting in a new transmission vs. rebuilding. All ready done valve job . Once the failure has occurred, the AFM shut off methods other than that probably wont work. 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. Do not pay that amount. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. There is a chance the cam lobe was stressed and started to deteriorate. Have a lifter problem on my 2010 5.3 Silverado. Regards, AFM Sucks!!! Why this happens is a more . 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. 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. We believe this confirmed that the AFM has never been operating in this vehicle. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). He used seafoam and changed to synthetic oil. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. My 5.3 is. There are so many moving components in an engine these days as opposed to the past. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. Number 7 cylinder lifters stops moving when truck starts. In four-cylinder mode, they act like air springs and allow for smooth operation. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Its not possible to install them wrong? With 40000 A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Take a look at what bmw did in its R1250 bike. Any guidance would surely be appreciated. Just pulled it down in the garage there was no other damage , luckily. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Truck has an active P0300 code and runs very rough. Shame this happened. Yes a poor design but a flaw ? The original version sprayed oil on the cylinder walls and increased oil consumption. This system is the most effective way to disable AFM. I speak from some experience. Are you saying that I am in the clear by a year and issues fixed? The car runs great apart from the shuddering at those speeds. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Is this due to the AFM being shut off? . My 2002 I had over 298K on it with no engine related issues. [] they have a downside? Unfortunately, I found out about the lifters too late. Thank you for your time. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . It has 8,000 miles on it. With 40000 Some drivers want V8 power under their foot at all times. I have an 07 Silverado 1500 ltz. What the biggest reported problem with Chevy Silverados? I called my service station and they told me to get it in ASAP. I have a Yukon 116k it now needs its 3rd set of lifters and cam. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. I have a 12 wit 4.8 Silverado 75000 miles 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. 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. If someone didnt want to spend gas buy a Toyota. The lifter seems to recharge whenever the truck sits for some time. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. [], [] 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. Really could use some pointers. Once I get it back, could I install the Disabler safely. Love the truck. Any thoughts or suggestions would be appreciated. Cant believe they havent fixed this in a decade. 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. But then she passed away from cancer. Because its not just GM that have engine problems. 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. 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 . Diablo says yes but they do not provide tunes. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Why would GM ever produce such problems with such little to gain. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . What can I expect with the AFM in place, or, with AFM disabled (not deleted)? There is a good chance that some of the drivers side lifters decided to go. 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. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps. 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. After reading these forums Im a little concerned about my decision to stay with GM. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. It also has an electrical connector on the back. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? 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. 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. Oil 0w or 5w -20 No movement on the rocker arms. .or something similar . We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. the extra oil isnt needed. so the trans fluid worked for you then? The collapsed lifters will not engage the pushrods and both valves remain closed. It is usually first noticed during highway driving. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Billy, there is some interesting trivia here on the L92. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Did not help. Then I guess I have to spend a bunch of money and get the delete kit. In other words, the crankshaft and bearings were not visible. The 2nd went with a conventional valvetrain. If the 4th cylinder lifter has failed, would driving it damage the engine? Verified over hundreds of trips, makes no sense. Get this, rebuild is only rings and maybe lifters. Have there been improvements in more recent model years employing AFM [2014 or newer]? 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. The biggest problem is nobody changes their oil on time. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? 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. Since the tranny oil worked, you should now change the oil, right? Can they be faulty? 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. I would just have the AFM disabled (tuned out) then. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. 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. Is this the shield you referred to in a past post? So now at 168 thousand miles it still runs good but gets bad gass mileage. The most common issue GM vehicle owners with AFM report is increased fuel consumption. A 14 gmc 5.3 Sierra 85000 miles It is being covered under warranty since I only have 72,000 miles on it. This is in response to pretty much everyone. The engine is running on only four cylinders. Thank you again for the response. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. They layed over night in engine oil before instalation. The trucks are only supposed to use two four. Run it and let it soak overnight. This is my project car and will be my drive (about 5000 miles a year). Install an AFM Delete Kit Would doing the disabler option once I get it back be the right one? In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Thats not all bad because it saves the cost of an AFM delete kit. This allows the engine to run in V8 mode. I know I felt the same way. Hi Grant is that disabler still working for you ? Regarding the cylinder deactivation impact on fuel consumption . 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. 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. This new lawsuit is essentially identical to the previous. 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. This happened on a camping trip with my kids last friday night. 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. I just did the delete and replaced the cam as well. It is also known as Displacement on Demand (DoD) or cylinder deactivation. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. . She started to have the lifter problem again after 60,000 miles more. Then it takes out the lifter again and again until you bite the bullet and replace the cam. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Replacing engine due to issues caused by AFM. But after reading this thread, Im a little concerned about the long-term reliability. My 5.3 has a vin code of O. lol. 2 15 with 5.3 Sierras both with 100k and The engine had 200K miles. A 14 gmc 5.3 Sierra 85000 miles Every one of these engine will have a lifter fail, this is a travesty! Toyota has their own problems. I have a shop 39 yrs . Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. AFM - active fuel management strategy which deactivates the lifters on specific . One must anticipate this. Have an intake and Borla exhaust. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. 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. Getting ready to diy for $450. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. 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. , Production date on the vehicle is 04/2006 oddly enough. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. 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. Replaced all lifters on passenger side as well as pushrods for even wear. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Now I get 24 to 26 with deactivation locked out and full power. 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). All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Replaced all lifters. Runs better than new now and no more oil consumpsion!! I drive the same 320 mile trip every two weeks and drive the same route and full tank. Thanks for the detailed post! The only solution is to replace the entire cylinder head. Ayush Srivastava Last GM Ill ever buy unless its got a diesel. 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. 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? I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 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. Never did strand me on the side of the road way. Just recently, GM announced a temporary closure. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. in your opinion will this work, i really dont see any reason it wouldnt. Pulled the inntake and replaced valleypan With all the solenoids. 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. No problems with any to this point. Thanks for the advice Brian! I still get a P0336 code every once in a while but still good to drive around town. The system uses solenoids to deliver oil pressure to control. A 17 with 5.3. 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? Ketil, let us know what you find out. If I put the Range module on, is that all I need to do, both now and long term? Was a disaster then but a profitable disaster. (Bought car 1 day before lifter died!) I have a 2011 GMC Sierra 1500 with the 5.3. []. Im servicing a 2011 Chevrolet 5.3 with AFM. I have a 12 with 4.8 Silverado 75000 miles All Gen IV engine blocks haveAFMtowers and oil passages cast in. All New lifters were from AC delco. Given that, would you recommend buying one of the OBD-II devices to disable AFM? 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. 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. I just got new warranty engine and dont want this issue again? Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. I would say maybe 5% of my customers keep up on their oil changes. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. 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. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? 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. I have no clue what to do now. Id wait until the warranty expires then disable. I always have done my oil changes on time, not sure about the people who owned it before me though. I have had some say that it is the valves and others say that it is the cats plugged. [], [] LS Tech: How to Delete VVT or DisableAFM []. Engine oil pressure is fine. Send response to tkrieg@cox.net. Having a hard time finding one .. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Then again, it should have never been controlling those solenoids. I have already dropped a lot of money on this truck (08 suburban). whith a disabler. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. I am leaning heavily on installing the AFM disabler. When you don't need the full power of the engine, it provides better fuel economy." TheAFMsystem can be identified by its components. also in the pan is another AFM oil filter near the external engine oil filter. 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. I have successfully used a gadget that plugs into the ODBII. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Is there any potential down-side to doing this in other words, might this do more harm than good? Most will want to get rid of the AFM immediately. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Having it fixed now, just curious Seems like a problematic design. I know a few guys with Tundras. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. It came back on last Wednesday starting with a flash. the body is in great shape. hi brian when you replace the lifters do you have to change the guides also? This is my second Avalanche and I never had any issues with either of them. 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? This lowers the cost of building it [], [] aluminum block engine. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Hello! [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. I had to replace them all and the camshaft as well. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. The oil is baked on to every component. Or not because it is the cast iron block and not he aluminum block? When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem.
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