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No it runs fine on sylinder one but not on 6 or 7!!! If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Our 2013 yukon with 47k miles just failed. 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. How is that an improvement. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. What type of disabler did you go with? 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. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. AFMengines use special lifters for cylinders 1, 4, 6, and 7. Driver reported this occurred suddenly while driving down the highway. Get this, rebuild is only rings and maybe lifters. Required fields are marked *. Another option is to plug it entirely if the AFM is already removed. Dont drive it if you have a dead cylinder due to afm failure. We believe this confirmed that the AFM has never been operating in this vehicle. When you eliminate the AFM system, the extra oil is no longer needed. Thats not all bad because it saves the cost of an AFM delete kit. If you just crack it without it starting it moves all the time . Its not possible to install them wrong? []. Im curious as to how much tran fluid you put in? it is the regulator guy! Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. All Cylinders. . 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. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. 1. Brian, I have the same question as Scott. I plan on getting a tuner to disable the AFM. If I put the Range module on, is that all I need to do, both now and long term? I guess I might have to call a dealership or GM to get a definite answer on this one. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. 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. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Then I guess I have to spend a bunch of money and get the delete kit. 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. Ill Never Ever buy another gm. I tried the trans fluid in the oil. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. 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. Having it fixed now, just curious Seems like a problematic design. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. I ave noticed the point about excess oil spray. 190k on the motor always ran AMSOIL full synth since new. I just took a long trip and it used 1.5 quarts of oil. Install ls3 valley cover. This basically deactivates the cylinder deactivation system. [], [] 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. I quites down to nothing after running for about a minute. He unstuck it and I took it for a drive and same thing happened. This is my second Avalanche and I never had any issues with either of them. .or something similar . No clue what to do. Put everything back together proper torque, gakets, valve seals, etc. Its got a hundred forty-five thousand miles on it. im going to plug in a dissabler when im done to keep it V8 mode all the time. Constant engine and transmission problems. Just recently, GM announced a temporary closure. the body is in great shape. 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 . The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Chevrolet 5.3 Engine Issues and Recommendations In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. I drive the same 320 mile trip every two weeks and drive the same route and full tank. 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. Is there any potential down-side to doing this in other words, might this do more harm than good? 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. Is there any reaction to the disabler when pulling a boat or trailer? Regards, There may be an ignition related issue on that cylinder. The lifter seems to recharge whenever the truck sits for some time. Im always sorry to hear when people run into issues like these. Ditto , never buy a throw away vehicle again is my recommendation and my fix . 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 []. Then had to drive the truck back to Tampa from Cheifland Fl. 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. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 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. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Easier said than done. A 14 gmc 5.3 Sierra 85000 miles Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. My daughters car had about 230,000 miles when she complained of the problem. There are no changes in the valves or the springs. 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 []. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . 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. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. That might show up if you cut the filter and looked for debris in the pleats. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. I wont bother with blocking the relief valve. My fear now is not will it happen but when! I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. [], I have a 2012 Silverado Z71 bought new. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. I asume low oil pressure cant make some of the DOD lifters to malfunction? An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. . AFM Sucks!!! [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. The trucks are only supposed to use two four. There is a chance the cam lobe was stressed and started to deteriorate. Fortunately I received a reducing in house shop hourly rate. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. 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). Is this due to the AFM being shut off? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Every one of these engine will have a lifter fail, this is a travesty! We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Excess oil will be pushed out of the pressure relief valve into the oil pan. in your opinion will this work, i really dont see any reason it wouldnt. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. Yes, always change all the lifters at once. 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? Run it and let it soak overnight. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Learn how your comment data is processed. Brian, According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Love the truck. Cylinders two, three, and eight are all similar in cylinder deactivation. I am trying to find out of this is true. Would it be fine to go ahead with the AFM Disabler? Only thing I noticed with the oil consumption issue. So I researched and got an AFM disabler. Pulled right valve cover an rockers on syl 6 dont move. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? Any thoughts or suggestions would be appreciated. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Bought an 07 GMC Yukon 5.3 with the AFM, 87k. If I had wanted a 4 banger I would have bought one. Thank you for your time. Are there errors or something only the dealer can clear? 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. 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. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? This system was originally used in early 1980s Cadillacs. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I have no other engine problems and Id like to fix the issue. I also notice that it doesnt go into V4 when it is cold. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. It does seem that when they start goingthey go quickly. There are so many more oil passages on engines these days. 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. They dont so any better than domestics on mpgs. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Cant believe they havent fixed this in a decade. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. 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). A 17 with 5.3. All the time. Below youll see references to the L99 as a result. It replaces the AFM components with standard parts. 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. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Now the problems back, I have 180k miles on it now. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . I have a Yukon 116k it now needs its 3rd set of lifters and cam. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. My 5.3 is. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. Would never take it on a long trip. 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. Number 7 cylinder lifters stops moving when truck starts. 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. 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). There are 5.3 cylinder deactivation problems that can occur. Any guidance would surely be appreciated. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! A lot of drivers reported losing 2-4 quarts of oil in between oil changes. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. 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. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. A 17 with 5.3. 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. This lowers the cost of building it [], [] aluminum block engine. 2 15 with 5.3 Sierras both with 100k and This is in response to pretty much everyone. 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. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). 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. You are correct. [] 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. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. Pulled the inntake and replaced valleypan With all the solenoids. Thankfull for any ideeas! At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. Thanks for your help. GM offers the following diagnostic steps in determining if this is the problem. Where can I buy a bolt to replace this relief valve ?? please respond with your opinion. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. The valve itself is part number W0133-2574213. I have a 2013 1500 with the LC9. what deleter (if thats a real word) have you heard good things about. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. This is what I keep telling people. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. IMHO . [] 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 []. Junk . There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Last GM Ill ever buy unless its got a diesel. I have a 2011 GMC Sierra 1500 with the 5.3. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I hate it. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. The engine will switch to operating on fewer cylinders when cruising at a constant speed. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Regarding the cylinder deactivation impact on fuel consumption . It is currently at the dealer having a new long block installed under warranty. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. [], [] as the LS engine familys hybrid engine in trucks and SUVs. The wife however found this deal on an Envoy Denali . The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? It only has about 9k miles on it. The biggest problem is nobody changes their oil on time. 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 had privilege to work on some of that garbage they never did work . They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. 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. Any advice that you could offer would be great. I dont plan on installing the delete kit at this time. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. All eight cylinders are now powering the engine. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Fouls those plugs. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. GM get a clue! Replacing engine due to issues caused by AFM. Or not because it is the cast iron block and not he aluminum block? Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Most will want to get rid of the AFM immediately. Will the plug in deactivater fix the oil consumption or will it cause more consumption? I got the AMF disabler anyway and so far so good. Thanks for the advice Brian! If possible, will simply not using VVT provide a powerful,good running engine? Changing the sensor didnt help. How do you know if the lifter has failed? 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. Unfortunately, I found out about the lifters too late. 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 speak from some experience. There has been a lifter noise since I bought the truck 1 year ago. . If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. You could also have tried that if the trans oil didnt work. Took the heads off again. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). 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. Because its not just GM that have engine problems. Thanks. The only solution is to replace the entire cylinder head. whith a disabler. 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? Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. What the biggest reported problem with Chevy Silverados? Told her that it would not last and that she needed to find a different way to get around. Install an AFM Delete Kit Any problems to watch out for?Did you replace the VLOM? On the AFM lifters that dosnt work i have installed them With the oil hole Down! My question is: do I install the electronic disabler on the new engine to avoid future issues? 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. The engine had 200K miles. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Definitely dont want to do anything to fix one problem and create another. Did Obama make them do this? 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. She started to have the lifter problem again after 60,000 miles more. Since the tranny oil worked, you should now change the oil, right? Have there been improvements in more recent model years employing AFM [2014 or newer]? My 2002 I had over 298K on it with no engine related issues. 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. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Replaced all lifters on passenger side as well as pushrods for even wear. Accept i only have 60K on my truck and it hasnt recovered.