Engine "drum roll" sound

[ramphil09]

Have a 2014 2500 Cummins 4x4. Sometimes when I'm slowing down (20-25mph) or driving slow at an idle I will hear coming from the engine area what I can best describe as a drum roll. Any idea what is causing it? Can't get to do it when a mechanic is present.

 

[otanisan]

Could it be fender lining,rubbing on tires?

 

[jws123]

Best thing to do is try to record it when it does it and upload it to here.

 

[crash68]

probably just the HPFP adjusting itself pressure wise. It's on the low rpm/load side to have the turbo farting, this usually occurs when the boost pressure lowers rapidly and air pressure pushes it's way back through the turbo.

 

[gtomike60]

Jake brake maybe?