Dan0

Thanks guys.

FunkTron

sounds like a shot bearing......
does it go away after warming up?

E55amg0220

could be a couple of things .....what comes to mind for me is

failing intercooler pump

bad dual idler pulley mine made a similar sound cause it was missing some of its plastic backing

or alt starting to go bad

Dan0

Thanks for the ideas guys, I'll take a closer look at those things tomorrow.

layzie12g

My car makes the same noise. I took off the undertrays and ran it. Its the oil pump.

E55amg0220

Wow thats a noisey oil pump if thats true wouldnt run the car again til fixed if ur sure

C32owner

I would agree to the intercooler pump first. I just changed out the bearings on the belt wrap kit and pulley set. They didn't last long at all if you have those installed.

211.070

This is the closest answer. Usually the oil pump chain tensioner gets weak, and allows the chain to make contact with the front cover. If someone wants this noise repaired you might as well replace the oil pump if you are that far in to the repair.