The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. I love the car so far. The older truck gets 19 mpg the newer truck with fuel management gets 14. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Only running on drivers side cylinders. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! I hate it. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. . Traded it with 180K miles and did not experience any problems. I would. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? 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 []. With 40000 It has plenty of oil pressure and I put all new lifters in it. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! I had to replace them all and the camshaft as well. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? I just got new warranty engine and dont want this issue again? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. Their tech guys have seen it all and may have some thoughts on this as well. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. I have no other engine problems and Id like to fix the issue. This new lawsuit is essentially identical to the previous. 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? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . It essentially turns your V8 engine into a V4 which saves fuel. The engine has flex-fuel capability. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. I have a 2013 1500 with the LC9. 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. Is this due to the AFM being shut off? Billy, there is some interesting trivia here on the L92. 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. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. I plan on getting a tuner to disable the AFM. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. It has AMF. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! AFMlifters have a history of failing and oil consumption can be a problem. Since no air can get in or out, four cylinders provide no power. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Then changed the oil. Is there any reaction to the disabler when pulling a boat or trailer? If you are using VVT, you could use the NAL-12612273 (L92) cam. Would doing the disabler option once I get it back be the right one? Would never take it on a long trip. 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. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I ran 0W-20 on more the 5000 miles between changes. RANGE TECNOLOGY.COM. bought at Brian Tooley Racing ! What type of ODBII gadget did you use? They layed over night in engine oil before instalation. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. I have a 2014 Silverado with a 5-3. I may just do that Vic. Most of the complaints show up in the 2009 to 2011 model years. If I put the Range module on, is that all I need to do, both now and long term? I know a few guys with Tundras. Just shut AFM off. Hopefully he can free up the stuck/collapsed lifter. It has 8,000 miles on it. 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. I want to put a AFM disabler in it what all do I need to have done. changed oil , its all working now, but want to disable this sorry system. Dont want to make a move on a new truck or jump to a 2500 yet. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. another common cause for low OP is the oil pick up tube O ring. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Just pulled it down in the garage there was no other damage , luckily. 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? I call it active obama fuel management .A scam . It seems this tough engine has everything incorporated into it. 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. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Then I guess I have to spend a bunch of money and get the delete kit. I own a reputable repair shop. Thanks for the advice Brian! Drives way better for my mostly paved road driving. 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. 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. I have an 07 Silverado 1500 ltz. Hi Brian, We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Engine starts but is throwing a misfire on cyls 4,7. "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. 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. The original version sprayed oil on the cylinder walls and increased oil consumption. A tuner can often fix that as well by giving it some more ignition advance in these regions. hi brian when you replace the lifters do you have to change the guides also? I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Then again, it should have never been controlling those solenoids. 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. Every one of these engine will have a lifter fail, this is a travesty! Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. Shame this happened. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). Friend will send to me from Arizona. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. [] they have a downside? On the AFM lifters that dosnt work i have installed them With the oil hole Down! I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. I sold them when they were new. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. They may be able to find some of those missing ponies. Cant believe they havent fixed this in a decade. It is usually first noticed during highway driving. I would appreciate it if you let me know how you make out. 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. All these comments on the 5.3 are blowing my mind!!!. If so what would the vin code be? Another option is to plug it entirely if the AFM is already removed. What would you do if you were in my situation? will feel like a jerk asking the clerk at lowes to cut them again. Have misfire code and engine has what I would call a surge while 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). It is replaceable.. just remove oil pan and it will be on top at the filter. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? I have a 2011 GMC with over 162,000 miles on it and it runs great! I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Is this an issue only with GM SUVs and trucks, or does it include cars too? With the nipple, or without? As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Should I buy one to disable the V4 mode? The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. .IMHO . 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. Lost number four I recently bought a low mileage 2013 Silverado and the lifters collapsed. She had driven it for a couple of months that way. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. How is that an improvement. 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. Nine plaintiffs filed the General . Pod. I know I felt the same way. One must anticipate this. Yes, always change all the lifters at once. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. You were lucky that it worked. 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. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Chris, when you did your delete, did you also change the cam at the same time? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Change your oil. I have had some say that it is the valves and others say that it is the cats plugged. 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. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Would it be fine to go ahead with the AFM Disabler? That might show up if you cut the filter and looked for debris in the pleats. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. 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? Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. 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. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. Thanks for your help. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? The motor I pulled was a 2007 LY5 with about 77k on it. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? I am leaning heavily on installing the AFM disabler. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Learn how your comment data is processed. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. All New lifters were from AC delco. 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. Thanks. 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". He used seafoam and changed to synthetic oil. Its Chrysler and Ford. Had nothing but trouble out of it. Does the Pressure relief vavle ever go bad?? All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. Run it and let it soak overnight. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. What makes you think it was a design flaw ? There are no changes in the valves or the springs. 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 ! My question is: do I install the electronic disabler on the new engine to avoid future issues? Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Now Im here tring to figure out what to do. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The valve itself is part number W0133-2574213. Its a CA EMMISIONS TRUCK. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . My 2011 Tahoe has a LMG motor in it with a build date of May 2011. 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. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. 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. I have been assuming this is just a slow to pump-up lifter or lifters. Your email address will not be published. If the lifter actually fails so that the mechanism wont release, it wont work. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Any help would be appreciated. But the problem at that time was the computer technology. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. They lasted one year with big problems. Id wait until the warranty expires then disable. Do you think I can still disable AFM? 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. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. It does seem that when they start goingthey go quickly. , Production date on the vehicle is 04/2006 oddly enough. Yes thats true. Dont drive it if you have a dead cylinder due to afm failure. There may be an ignition related issue on that cylinder. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. 50,000 miles. My 5.3 is. So I did the job one more time. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Any guidance would surely be appreciated. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. It has has 9000 miles and no lifter or other issues or codes so far. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Hello! I have a 2012 Chevy Avalanche. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I dont plan on installing the delete kit at this time. How long did it take? It came back on last Wednesday starting with a flash. has 92,000 miles and was just told I have cam and lifter failure. Don't even get me started on the shortened life of the cooling, starting and charging systems. 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. Or not because it is the cast iron block and not he aluminum block? Im confused from the write up about the plug in. If you left the original cam in, the AFM cylinders will be down about 25 lbs. If I had wanted a 4 banger I would have bought one. I read something the other day which I found to be funny. how many miles do you have on your engine? There are so many moving components in an engine these days as opposed to the past. Chevrolet 5.3 Engine Issues and Recommendations We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. I speak from some experience. Who knew? Any thoughts or suggestions would be appreciated. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Brian, I have been reading your article about the AFM. Engine oil pressure is fine. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Everything was fine for two weeks, ow customer complains s it same noise it made as before. The engine will switch to operating on fewer cylinders when cruising at a constant speed. 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. How do you know if the lifter has failed? The engine had 200K miles. 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. I had one fail and it chattered the cam to the point that I had to Install a new cam. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Fortunately, the old engine hadnt been shipped back to the remanufacturer. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. 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. There is a good chance that some of the drivers side lifters decided to go. It also mentions a valve cover replacement with revised PCV valve design. Regardless of the AFM solenoid being commanded on or off. How did your turn out? Some drivers want V8 power under their foot at all times. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. I havent has any lifter or cam issues. 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. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. I am having that done today on my 08 Suburban and its only costing me $225. Regards, Its ribbed with solenoids on the underside. .or something similar . Replaced all lifters on passenger side as well as pushrods for even wear. Having a hard time finding one .. 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. 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 have an 07 Yukon with 230k on the engine. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? . All ready done valve job . the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. Love the truck so far. But after reading this thread, Im a little concerned about the long-term reliability. I drive the same 320 mile trip every two weeks and drive the same route and full tank. I have a 12 with 4.8 Silverado 75000 miles stalled in a certain way a warning wouldn be a bad idea. I quites down to nothing after running for about a minute. Battery was unplugged for a week.. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. misfire or anything. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. After all we bailed them out of bankruptcy. My question on a 2007 Chevy Tahoe 5.3 AFM I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. in your opinion will this work, i really dont see any reason it wouldnt. A 14 gmc 5.3 Sierra 85000 miles Thank you again for the response. One alternative is to swap in one of the larger 6.0 non-AFM truck cams.
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