Here's what you need to know: 1. 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. All ready done valve job . 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. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Chris, when you did your delete, did you also change the cam at the same time? Given that, would you recommend buying one of the OBD-II devices to disable AFM? Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. 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. They dont so any better than domestics on mpgs. 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. 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. The write up confuses me. It was good for about 10 miles and started with same loud knock noise. She had driven it for a couple of months that way. Thanks. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. Having it fixed now, just curious Seems like a problematic design. Since the tranny oil worked, you should now change the oil, right? Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. 1. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. Seafoam with syn oil change only fixed for a week. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. What type of ODBII gadget did you use? One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . 2011 Chevy Avalanche LTZ. I am wondering the same thing. Your email address will not be published. I have a 2012 Chevy Avalanche. Not sure what else it can be. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Last GM Ill ever buy unless its got a diesel. Driver reported this occurred suddenly while driving down the highway. I noticed this discussion mainly addresses Chevy Silverados and other trucks? If the lifter actually fails so that the mechanism wont release, it wont work. The lifter seems to recharge whenever the truck sits for some time. Below youll see references to the L99 as a result. No it runs fine on sylinder one but not on 6 or 7!!! The engine is running on only four cylinders. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! 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. On the AFM lifters that dosnt work i have installed them With the oil hole Down! NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? Send response to tkrieg@cox.net. Very confusing stuff out there. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Definitely dont want to do anything to fix one problem and create another. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. Only thing I noticed with the oil consumption issue. They should let us the better mileage. Is this an issue only with GM SUVs and trucks, or does it include cars too? I have been assuming this is just a slow to pump-up lifter or lifters. 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. Constant engine and transmission problems. My 5.3 is. When you eliminate the AFM system, the extra oil is no longer needed. Why would GM ever produce such problems with such little to gain. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? Should I buy one to disable the V4 mode? 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? You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . [], [] 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. 2 15 with 5.3 Sierras both with 100k and All Cylinders. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Can they be faulty? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. Teflon coatings does not last. Everything else looked good. If I put my truck in manual 5, it doesnt try to go into V4 mode. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. With 40000 . I own a reputable repair shop. Any truth to that? The collapsed lifters will not engage the pushrods and both valves remain closed. I loved this rtuck until this happened!! If buying a tuner/chip which works best for that truck/engine? I have a 2014 Silverado with a 5-3. 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. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. 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. The 2016+ Tacomas are junk. 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 no air can get in or out, four cylinders provide no power. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Because its not just GM that have engine problems. What the biggest reported problem with Chevy Silverados? There are no changes in the valves or the springs. Some guys have been able to use a tool through the top with the cover off to get it to release. Everything was fine for two weeks, ow customer complains s it same noise it made as before. so the trans fluid worked for you then? 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. It also has an electrical connector on the back. If you just crack it without it starting it moves all the time . If the 4th cylinder lifter has failed, would driving it damage the engine? Accept i only have 60K on my truck and it hasnt recovered. I just did the delete and replaced the cam as well. how many miles do you have on your engine? Very expensive repair too! At this state, a disabler would probably do what you need it to do. Sylinder one lost compression on my 09 5,3. The Jury is still out on the Gen. 5s but the warranty could be an issue. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. Better airflow reduces drag on the pistons and the associated pumping losses. They are taller and have special oil holes. 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. Would it be fine to go ahead with the AFM Disabler? So for all of you that continue to complain about how bad these things are. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Their tech guys have seen it all and may have some thoughts on this as well. Some drivers want V8 power under their foot at all times. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. If possible, will simply not using VVT provide a powerful,good running engine? I asume low oil pressure cant make some of the DOD lifters to malfunction? I ordered a electronic disabler for it today. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. My question is: do I install the electronic disabler on the new engine to avoid future issues? Toyota will be my next truck unless GM owns up and makes wright with consumers. TheAFMsystem can be identified by its components. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. GM should recall every vehicle with this terrible design flaw! Oil flows to the special lifters through theAFMtowers. I just took a long trip and it used 1.5 quarts of oil. With 40000 What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Because I want to. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Another option is to plug it entirely if the AFM is already removed. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. This new lawsuit is essentially identical to the previous. Dod is the biggest failure sence the 8-6-4 caddie in 1981. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. 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. 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? Brian, I have the same question as Scott. Friend will send to me from Arizona. I have the towing package on my 13 Tahoe LTZ. will feel like a jerk asking the clerk at lowes to cut them again. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. There may be an ignition related issue on that cylinder. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? I have an 07 Yukon with over 180K. Any problems to watch out for?Did you replace the VLOM? Truck has an active P0300 code and runs very rough. 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". 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 am considering the same. Have there been improvements in more recent model years employing AFM [2014 or newer]? . Took it to a shop and they advised that it could be due to the AFM system not functioning properly. please respond with your opinion. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Get this, rebuild is only rings and maybe lifters. AFMengines use special lifters for cylinders 1, 4, 6, and 7. The oil is baked on to every component. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. I tried the trans fluid in the oil. do you fill to capacity anyways???? GM claims fuel improvements ranging from 5%-15% depending on the engine. It is usually first noticed during highway driving. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? If someone didnt want to spend gas buy a Toyota. Corvette that does employ AFM. The car runs great apart from the shuddering at those speeds. Im confused from the write up about the plug in. Ditto , never buy a throw away vehicle again is my recommendation and my fix . A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . So I researched and got an AFM disabler. Thank you for your time. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Do you think I can still disable AFM? https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? The biggest problem is nobody changes their oil on time. 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. If you are using VVT, you could use the NAL-12612273 (L92) cam. So now at 168 thousand miles it still runs good but gets bad gass mileage. 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. 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. It is also known as Displacement on Demand (DoD) or cylinder deactivation. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. There is a chance the cam lobe was stressed and started to deteriorate. I havent has any lifter or cam issues. You also need the disabler installed in your obd connector. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Was a disaster then but a profitable disaster. 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. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. has 92,000 miles and was just told I have cam and lifter failure. Nine plaintiffs filed the General . Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy I have a shop 39 yrs . Now you tell me AFM works and I will tell you; that you are full of shit! 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. Replaced all lifters. The older truck gets 19 mpg the newer truck with fuel management gets 14. However, the fuel savings are not always as much as expected. We believe this confirmed that the AFM has never been operating in this vehicle. 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. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. I just bought a 2018 Silverado. You could also have tried that if the trans oil didnt work. Cylinder Deactivation to the Rescue. It has has 9000 miles and no lifter or other issues or codes so far. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? This system is the most effective way to disable AFM. Once the failure has occurred, the AFM shut off methods other than that probably wont work.
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