2008 Denali 6.2L engine rattle

[ggwash21]

2008 Denali XL 6.2 116k
The engine has a lifter type rattle/noise
When I rev the motor up no matter if it's 1500rpms or 5000rpms
The rattle maintains the same rythm if I could upload a sound clip I would do so
It's loudest coming from the drivers side rear of the engine.
It's driving me nuts

 

[JennaBear]

Sounds like an AFM lifter issue.

 

[ggwash21]

I googled it, and it's pretty damn close... I took a video but YouTube won't let me upload it.
It's been driving me nuts... Pretty sure that's it.
Thanks

 

[ggwash21]

Will turning off AFM stop this noise or do I replace them?
Thanks

 

[JennaBear]

Unfortunately, lifters have to be replaced.

 

[08grey]

Since when does a 08 6.2 have afm?

 

[JML07denali]

Since when does a 08 6.2 have afm?

Agreed, I thought that AFM was only available in the 5.3L??

 

[YuCanada]

Agreed, I thought that AFM was only available in the 5.3L??

My 6.0 has it


Sent from my iPhone using Tapatalk

 

[JennaBear]

Missed the year. The 2008 does not have AFM, just standard lifters. But still sounds like a lifter issue. Could be piston slap though, which usually goes away when warm. However, some of the early 6.2s would not stop doing it when warmed up.

 

[Jonah52]

common 6.2 problem that I have not experienced with my personal truck, but have seen on others. I think there is a TSB that states lifters need replaced. And correct 08 has no AFM.

David, your 6.0 is a different animal lol