Now Im here tring to figure out what to do. This system was originally used in early 1980s Cadillacs. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. If I put the Range module on, is that all I need to do, both now and long term? The 5 Most Common Chevy EcoTec3 5.3L Engine Problems A 17 with 5.3. The trucks are only supposed to use two four. Is the Pressure relief valve replaceable? If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). (Bought car 1 day before lifter died!) misfire or anything. Truck has an active P0300 code and runs very rough. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. A tuner can often fix that as well by giving it some more ignition advance in these regions. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. Changing the sensor didnt help. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Getting ready to diy for $450. Brian, I have the same question as Scott. Does the Pressure relief vavle ever go bad?? Does cylinder deactivation affect engine life? - Quora TheAFMcylinders are opposite of one another in the firing order. What makes you think it was a design flaw ? Call chevy.They should being paying most of that. Every one of these engine will have a lifter fail, this is a travesty! After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. 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. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Does the disabler prevent the engine damage in the first place? 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. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. 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. There are so many moving components in an engine these days as opposed to the past. They layed over night in engine oil before instalation. Dod is the biggest failure sence the 8-6-4 caddie in 1981. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Any guidance would surely be appreciated. do you fill to capacity anyways???? The 2016+ Tacomas are junk. 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. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? New plugs and wires. I will be installing the AFM deactivator tonight when I get hoe. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. 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. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Just pulled it down in the garage there was no other damage , luckily. Lost number four GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs It uses a M14 x 1.5 thread plug like Dorman 65217. Brian, I have been reading your article about the AFM. No movement on the rocker arms. Put everything back together proper torque, gakets, valve seals, etc. 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 call it active obama fuel management .A scam . If you left the original cam in, the AFM cylinders will be down about 25 lbs. Truck ran fine before that. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority So I researched and got an AFM disabler. Yes, always change all the lifters at once. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Disable Active Fuel Management - Ricks Free Auto Repair Advice 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". Had similar problems under warranty, no telling what they rigged me up with at the dealer. Im always sorry to hear when people run into issues like these. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Is there any reaction to the disabler when pulling a boat or trailer? Loved the looks and interior and thought a I got a great deal at $6k even. Solenoids, new lifters also test voltage to solenoid pack all good their, 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. You are correct. There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. I recently bought a low mileage 2013 Silverado and the lifters collapsed. I have no clue what to do now. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. Replaced all lifters on passenger side as well as pushrods for even wear. 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. Some guys have been able to use a tool through the top with the cover off to get it to release. Another option is to plug it entirely if the AFM is already removed. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Just recently, GM announced a temporary closure. My 5.3 is. I would appreciate it if you let me know how you make out. 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. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. No it runs fine on sylinder one but not on 6 or 7!!! If you just crack it without it starting it moves all the time . $8500.00 fix. I just got new warranty engine and dont want this issue again? I dont know where to being to look for the problem. They are taller and have special oil holes. But it also restricts passages that the oil runs through. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. It has plenty of oil pressure and I put all new lifters in it. , Production date on the vehicle is 04/2006 oddly enough. Easier said than done. [], [] 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. After reading these forums Im a little concerned about my decision to stay with GM. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. [] 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 []. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Have a lifter problem on my 2010 5.3 Silverado. Most of the complaints show up in the 2009 to 2011 model years. Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority stalled in a certain way a warning wouldn be a bad idea. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. 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. Remembered that after I bought my Tahoe. 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. 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. im going to plug in a dissabler when im done to keep it V8 mode all the time. Replaced all lifters. 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. She started to have the lifter problem again after 60,000 miles more. Was a disaster then but a profitable disaster. When you drain the oil at three to four thousand miles its still clean. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. 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. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. Your email address will not be published. We chickened out though and just bolted the AFM solenoid plate onto the used engine. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. I read something the other day which I found to be funny. Send response to tkrieg@cox.net. Can they be faulty? That inherently less smooth operation requires additional NVH dampening. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. GM switched over to the 4100 v-8 in 1982. Corvette that does employ AFM. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Since the tranny oil worked, you should now change the oil, right? It prevents the computer from switching over to four-cylinder mode. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). My question on a 2007 Chevy Tahoe 5.3 AFM also in the pan is another AFM oil filter near the external engine oil filter. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. 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. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in AFM - active fuel management strategy which deactivates the lifters on specific . But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Would installing the Disabler solve this? Oil 0w or 5w -20 Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. Why would GM ever produce such problems with such little to gain. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Because I want to. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. I just did the delete and replaced the cam as well. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. If buying a tuner/chip which works best for that truck/engine? The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . 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 []. 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? Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? Not sure what else it can be. Thankfull for any ideeas! I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Chevy Silverado V8 To V4 Problems - Tools Bible A 14 gmc 5.3 Sierra 85000 miles I have 217,000+ on it and it never fails meever! What the biggest reported problem with Chevy Silverados? So now at 168 thousand miles it still runs good but gets bad gass mileage. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves.
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