Dod is the biggest failure sence the 8-6-4 caddie in 1981. Just shut AFM off. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Disable the afm. 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 []. It does seem that when they start goingthey go quickly. Its Chrysler and Ford. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines.
Go Small? Common Problems With the Chevy Silverado 2.7L Turbo General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . 1. . Since the tranny oil worked, you should now change the oil, right? The collapsed lifters will not engage the pushrods and both valves remain closed. A 14 gmc 5.3 Sierra 85000 miles Hopefully he can free up the stuck/collapsed lifter. 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. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. i just bought a 2018 Silverado with the 5.3 [] 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. One the other hand, it came without AFM, VVT, or flex fuel capability. 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. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. If I had wanted a 4 banger I would have bought one. 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. Last GM Ill ever buy unless its got a diesel. 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. 2011 Chevy Avalanche LTZ. .IMHO . Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Any advice that you could offer would be great. Now you tell me AFM works and I will tell you; that you are full of shit! 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.
GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 AFMlifters have a history of failing and oil consumption can be a problem.
The 5 Most Common Chevy EcoTec3 5.3L Engine Problems No other V-8 truck of similar weight can do that (except another GM with AFM). It is usually first noticed during highway driving. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. hi brian when you replace the lifters do you have to change the guides also? Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. It has the orings in place, that seals the towers. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. I always have done my oil changes on time, not sure about the people who owned it before me though. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve.
2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver Run it and let it soak overnight. I have been assuming this is just a slow to pump-up lifter or lifters. Battery was unplugged for a week.. However, they are only functional on engines that usedAFM. I havent has any lifter or cam issues. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Brian, I have been reading your article about the AFM. Im always sorry to hear when people run into issues like these. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. When they are locked into position, they wont wear further and cause issues down the road. 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. 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. There are so many more oil passages on engines these days. 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. Engine starts but is throwing a misfire on cyls 4,7. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Didnt change exhaust nor tune so likely no change in power/torque. When you eliminate the AFM system, the extra oil is no longer needed. Im confused from the write up about the plug in. I was getting ~ 30 mpg, so I love that. All eight cylinders are now powering the engine. 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. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Clean oil is crucial. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Dont drive it if you have a dead cylinder due to afm failure. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. 1981 Cadillac V 864. How is that an improvement. Would you get enough power to drive at freeway speeds? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. He used seafoam and changed to synthetic oil. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. 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. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Thanks for the detailed post!
Problems regarding Chevy 5.3L engines ticking noise and misfire. 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. 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). Why would GM ever produce such problems with such little to gain. The most common issue GM vehicle owners with AFM report is increased fuel consumption.
Why does GM's cylinder deactivation cause lifter failure? The car runs great apart from the shuddering at those speeds. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Pulled the inntake and replaced valleypan With all the solenoids. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. whith a disabler. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Thats a tough call, if the warranty will cover itId let it run out. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. The lifter seems to recharge whenever the truck sits for some time. Love the truck so far. the extra oil isnt needed. The trucks are only supposed to use two four. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. 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. Because its not just GM that have engine problems. Would never take it on a long trip. Then I guess I have to spend a bunch of money and get the delete kit.
Removing ignition lock cylinder when it won't turn at all Any problems to watch out for?Did you replace the VLOM? . I went with the new motor for the warranty. I would say maybe 5% of my customers keep up on their oil changes. What was happening to the first is slowly (or quickly in your case) happening to the others. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. On the AFM lifters that dosnt work i have installed them With the oil hole Down! With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Take a look at what bmw did in its R1250 bike. This basically deactivates the cylinder deactivation system. I would. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. GM get a clue! When you don't need the full power of the engine, it provides better fuel economy." Drives way better for my mostly paved road driving. Im praying that my RangeTech buys me a few years. in your opinion will this work, i really dont see any reason it wouldnt. The computers had not evolved enough to control the sytem. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. There may be an ignition related issue on that cylinder. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design.
Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. AFMengines use special lifters for cylinders 1, 4, 6, and 7.