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2014 chevy Silverado active fuel management

skunkstripe

By skunkstripe
in Engines & Drivetrain

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skunkstripe Enthusiast

skunkstripe

Posted
Posted

I have been reading on the net. that the active fuel management uses oil over time. I was wondering if that is something that they have addressed in the new 2014 silverado 5.3s. Or is it an on going problem. Or just people complaining who has abused there trucks. Just wondering. Thanks again .

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pm26 Senior Enthusiast

pm26

Posted
Posted

GM had problems with the AFM system in the past and some trucks were using oil due to bad design of the system. It is likely that they eliminated the oil burning problems by now, but I do not know that for a fact. Some people still complain about rough switching between 4 and 8 cylinders. Some trucks appear to be better than others in this category.

MTB Enthusiast

MTB

Posted
Posted

In the 2007 that I drove for six years it would use a quart at about the 5K mile mark. Seeing that I used synthetic oil I only changed when the oil life would drop below 20% and I routinely got 6K-7K miles between oil changes. I suppose that had I changed on the every 3K that I have in every other truck I have ever owned I would not have known or noticed....

 

Now the rear main that started leaking at 125K miles is a different story and is probably why I am driving a 2014 now.

fondupot Senior Enthusiast

fondupot

Posted
Posted

If you are concerned about oil consumption there is a company that makes a module that plugs into the ODBII port that disables AFM without a full on custom tune.

 

Range Technology. Currently the module is "beta" testing for 2014 trucks, but I just got mine and it works like a charm.

bladz1454 Enthusiast

bladz1454

Posted
Posted

Hey Fondu, let us know how it impacts the MPG when you have a chance. I was looking at the same module and noticed theres one for better MPG but it just makes no sense turning our trucks into 4 bangers

shotmark Enthusiast

shotmark

Posted
Posted

If you are concerned about oil consumption there is a company that makes a module that plugs into the ODBII port that disables AFM without a full on custom tune.

 

Range Technology. Currently the module is "beta" testing for 2014 trucks, but I just got mine and it works like a charm.

works indeed i got mine and its beast.. can deff feel a difference

mzodarg Senior Enthusiast

mzodarg

Posted
Posted

works indeed i got mine and its beast.. can deff feel a difference

So how is it a beast when all the Range does disable the AFM (DOD)................Really!

fondupot Senior Enthusiast

fondupot

Posted
Posted

Hey Fondu, let us know how it impacts the MPG when you have a chance. I was looking at the same module and noticed theres one for better MPG but it just makes no sense turning our trucks into 4 bangers

 

Word, I will. Only used it for about 20 miles so far. So no telling the difference, other than it stays in V8 all the time. I'm going on a road trip next week and will report my mileage findings when I get back.

shotmark Enthusiast

shotmark

Posted
Posted

So how is it a beast when all the Range does disable the AFM (DOD)................Really!

its just when you step on the pedal and you hear all 8, and your doing like 30 makes it feel so much better

mzodarg Senior Enthusiast

mzodarg

Posted
Posted

its just when you step on the pedal and you hear all 8, and your doing like 30 makes it feel so much better

So what your saying is when stepped on the peddle before it would stay in V4? Hmmm.....

fondupot Senior Enthusiast

fondupot

Posted
Posted

So how is it a beast when all the Range does disable the AFM (DOD)................Really!

 

Yea it reduced the lag going from V4 to V8. You're already in V8 so it just goes.

pm26 Senior Enthusiast

pm26

Posted
Posted

Hey Fondu, let us know how it impacts the MPG when you have a chance. I was looking at the same module and noticed theres one for better MPG but it just makes no sense turning our trucks into 4 bangers

Sorry to say this, but the way things are going with the government unrealistic mileage requirements,

it looks like someone will be driving 4 cylinder turbo engine trucks in very near future. With even higher sticker prices.

tpgdiver Enthusiast

tpgdiver

Posted
Posted

I can barely noticed the switch between V4 and V8. I had the truck over 90 mph (near Austin where speed limit is 85) over the weekend, and was surprised it switched to V4 mode at that speed. My 2008, rarely if ever went to V4 once you hit over about 70 mph. I drove over 400 miles during this trip and averaged 21.9 miles per gallon.

 

I do have a question about the active fuel management system. When it switches to use 4 cylinders, it is always the same 4 cylinders that shut off?

DanielAcosta Enthusiast

DanielAcosta

Posted
Posted

Regarding V4-V8 mode, under light throttle I can accelerate from about 15 all the way to 55mph on 4 cylinders, but don't recommend this in heavy traffic. Haven't used any oil yet in the first 16K miles.

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He was in because his engine had started knocking on the way to work. And by the time I got the valve cover off, I already knew it was too late. Lifter collapsed. Cylinder 5. Camshaft chewed up. The whole top end shot. Same kind of truck. Same motor. Same roads, probably the same dealer. The only thing separating those two men was information. I've been at this since 2008, and I've worked on everything GM puts out. Silverados. Sierras. Tahoes. Yukons. Suburbans. Escalades. The 5.3 and the 6.2. Doesn't matter which badge is on the tailgate. They all carry the same problem. So here's the information one of those guys had and the other one didn't. It's called Active Fuel Management. AFM. GM started building it into their V6s and V8s back in 2007 to squeeze out a little better mileage on the highway. Maybe a mile or two a gallon. All to hit government fuel economy numbers. The way it works, the motor quietly shuts down half its cylinders when you're just cruising along. And the little lifters that pull that off have a tiny pin inside them that's constantly clicking in and out. Lock, unlock, lock, unlock. Hundreds of times a drive. Thousands of times a week. Eventually one of those pins wears through. The lifter drops. And it starts grinding the camshaft down like a chisel on butter. And what nobody tells you is that the shudder you feel around 40 or 50 mph? That's the system cycling. Every single time. Here's what really gets me. The pre-2007 trucks, the ones without AFM, they're bulletproof. I've got customers still daily driving them with 260,000 miles on the odometer. Not a problem in the world. GM took a perfectly good motor that would have lasted a lifetime and bolted this system onto it. And it is wrecking engines that should have run forever. The guys who hang around the forums already know all of this. So do the techs. They handled this years ago. 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