Please someone identify this noise.. PLEASE

[Rckslick333]

Im not sure if its a pulley, an engine component but im tired of it. Someone please help.

http://www.youtube.com/watch?v=2XwkmuvPjc0

If you've heard this noise before please voice your input!

Thank you very much!

 

[Limited02]

Sounds like you have a ported and plugged eaton under there!!! I have no idea, but wish you luck!

 

[corkey]

it sounds like the idler pulley bearing is going bad, take the belt off spin each pulley by hand, and listen