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Active Fuel Management kills another lifter

Dock Rocker

By Dock Rocker
in Troubleshooting & Recalls

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Dock Rocker Enthusiast

Dock Rocker

Posted
  • Author
Posted

Like another poster said, this isn't an LS engine, so your Google search is meaningless.

 

How do you know AFM caused your problem? What cylinder was the lifter failure on?

 

And what filter screen and sending unit are you referring to? The fuel pump?

Meaningless? Seriously. Have you ever used Google? I used the year model of the truck not the series of engine.

 

If you would use Google yourself rather than trying to be a smarty pants on the interwebs you too could figure it is a common problem.

 

The filter I am referring to is the one under the oil sending unit at the rear of the intake.

 

4200c2fc2908cc8b62954023a53d67ce.jpg

 

This is an interesting post I found on the subject with my obviously lacking Google-Foo.

 

http://www.performanceboats.com/pb-open-water/76350-attention-owners-variable-displacement-gm-v8s.html

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muddkatt Senior Enthusiast

muddkatt

Posted
Posted

Meaningless? Seriously. Have you ever used Google? I used the year model of the truck not the series of engine.

 

If you would use Google yourself rather than trying to be a smarty pants on the interwebs you too could figure it is a common problem.

 

The filter I am referring to is the one under the oil sending unit at the rear of the intake.

 

4200c2fc2908cc8b62954023a53d67ce.jpg

 

This is an interesting post I found on the subject with my obviously lacking Google-Foo.

 

http://www.performanceboats.com/pb-open-water/76350-attention-owners-variable-displacement-gm-v8s.html

 

The link you posted is from 2010. The engines today have been redesigned.

Jon A Senior Enthusiast

Jon A

Posted
Posted

He had a lifter fail, it was either an AFM lifter or it wasn't. Obviously the dealer knows and likely told him which it was. Failure of non-AFM lifters on LS and LT engines is pretty close to unheard of with stock valvetrains. And yes, they are the exact same lifters (12576400 non-AFM, 12619820 AFM).

TxTruckMan Senior Enthusiast

TxTruckMan

Posted
Posted

This is an interesting post I found on the subject with my obviously lacking Google-Foo.

Doh!

 

You can say that again.

 

What year truck do you have?

 

And FYI, if it was a common problem with these trucks, there would be a 200+ page thread here like the other common problems. There's not. You're like the third person to claim having a failed lifter. That's not very common in my book.

Jon A Senior Enthusiast

Jon A

Posted
Posted

Virtually every serious engine problem on the 2014+ trucks reported on this site has been traced back to a failed AFM lifter and/or a failed valvespring (which need to be weak because the AFM lifters can't handle strong springs).

 

It may not be common, but it is the most common cause of serous problems with these engines. They are a weak point, denying that is simply denying reality and is pointless.

 

The bad news people need to understand is that simply deactivating the system doesn't make the lifters any stronger--they're still more likely to fail than the non-AFM lifters. The only way to make the valvetrain bulletproof is to replace them, which is pretty labor-intensive on these engines.

 

But that also allows you to sell a cam-swap to the wife as a "durability and safety improvement."

  • 4 weeks later...
15silver Enthusiast

15silver

Posted
Posted

when I worked at GM, they made 1350 trucks every day at our plant. Even 1 or 2 shifts on Saturdays to boot.

There were 2 other truck plants cranking out 2 or 3 shifts worth each.

So letting that sink in - any comments on any forum represent a miniscule percentage of the number of produced vehicles in a year. Trying to get any dealer to take a forum's results seriously based on that alone, is pretty optimistic.

It is great none the less for folks to share their experiences. Given the different levels of interest one experiences across dealerships, its good to have a resource like this to compare each other's results and see what worked, considering a lot of dealers drop the ball.

Personally I'd like to see the manufacturers forced to list the top 20 issues and their success rate of repair. Not likely to happen in my lifetime.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

People don't understand just how many vehicles the plants crank out per shift. At the GM plant here in OKC when I worked there a car rolled off of the assembly line every 60 seconds or less depending on production needs. We pushed out almost 1000 cars a day, then times that by 50 weeks since GM does a mandatory 2 week maintenance shutdown each year and you get 250k cars a year just at the plant I was at in OKC.

 

More popular vehicles as said have multiple plants, so it is easy to say as in the trucks that a million trucks per year could be produced easily.

ewbldavis Enthusiast

ewbldavis

Posted
Posted

 

 

But that also allows you to sell a cam-swap to the wife as a "durability and safety improvement."

 

Nice. Like how our sales manager convinced his wife the difference between a GSXR750 and GSXR1100 was the frame size. :)

chas0218 Enthusiast

chas0218

Posted
Posted

I haven't been following the forums in a while but was wondering if the AFM system is also present in the 2500 series 6.0L? If so are they having similar problems or did GM finally come up with a solution for the lifter failure other than a few instances? Also did they go to the 60k mile warranty instead of 100k because of this issue and they don't want to back their vehicles knowing there is an issue. I am currently undecided between the 6.4L 2500 Ram and 6.0L 2500HD but based on what I have been reading the reliability issue of GM I am leaning towards the Ram. Don't get me wrong I have been a long time GM guy but after issues I have had with my 03 Silverado and the track record they have had with the lifter issues makes me weary.

Rkaroll953 Enthusiast

Rkaroll953

Posted
Posted

I haven't been following the forums in a while but was wondering if the AFM system is also present in the 2500 series 6.0L? If so are they having similar problems or did GM finally come up with a solution for the lifter failure other than a few instances? Also did they go to the 60k mile warranty instead of 100k because of this issue and they don't want to back their vehicles knowing there is an issue. I am currently undecided between the 6.4L 2500 Ram and 6.0L 2500HD but based on what I have been reading the reliability issue of GM I am leaning towards the Ram. Don't get me wrong I have been a long time GM guy but after issues I have had with my 03 Silverado and the track record they have had with the lifter issues makes me weary.

The 6.0 in the 2500 is not a gen 5 engine like the Direct injection style ones in the 1500. That being said the chevy 6.0 is Litterally BULLETPROOF. i have had 2 in the past with 200k miles. they were worked every day and they asked for more every startup. Hell my friend pulled one out of the junkyard out of a hummer and put it in his C10 and has been running 10 lbs of boost with a supercharger on the stock internals for several years now. its been around since 2000 so think of that before you go buy some italian fiat ram

chas0218 Enthusiast

chas0218

Posted
Posted

The 6.0 in the 2500 is not a gen 5 engine like the Direct injection style ones in the 1500. That being said the chevy 6.0 is Litterally BULLETPROOF. i have had 2 in the past with 200k miles. they were worked every day and they asked for more every startup. Hell my friend pulled one out of the junkyard out of a hummer and put it in his C10 and has been running 10 lbs of boost with a supercharger on the stock internals for several years now. its been around since 2000 so think of that before you go buy some italian fiat ram

Great, appreciate the info. I have always liked GM products over Dodge and Ford for reliability unlike most I realize every manufacturer has issues it is just how it is handled that makes a person come back.

  • 3 years later...
Muchi New Member

Muchi

Posted
Posted

2016 Sierra Denali 6.2.  AFM.. 46000. 2 lifters collapsed. Plus a bent push rod.  Lifters back ordered. Not sure when they will be in... 1500 miles from home.  Going to look at buying unit to disable AFM. SUGGESTION?  Thanks for Dealer assistance. 

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted
19 minutes ago, Muchi said:

2016 Sierra Denali 6.2.  AFM.. 46000. 2 lifters collapsed. Plus a bent push rod.  Lifters back ordered. Not sure when they will be in... 1500 miles from home.  Going to look at buying unit to disable AFM. SUGGESTION?  Thanks for Dealer assistance. 

Most use Black Bear Performance to disable the AFM. 

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