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Old 11-15-2012, 11:45 PM   #10
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Join Date: Jul 2011
Location: Pittsburgh
Posts: 2,272
My Ride: '01 325i
Originally Posted by Blocked Out View Post
If the sound is RMP dependent, meaning if the sound increases in repetition as the RPMs increase then it has to do with engine and engine driven parts. You have to start diagnosing by the process of elimination. Take the bets off and start the car and listen to that same sound that you heard with the belts on. Obviously start the car when its cold so you have a good 10min of safe engine running time before it'll start overheating.

It could also be as simple as an exhaust leak or a loose heat shield.
Thanks blocked. Always love hearing from you. I respect your always professional advice, and you are one of the only fanatics that I respect to the utmost.

But back to the topic, I have diagnosed it as a exhaust leak. I covered the crack up with some rags and the noise became muffled.
2001 325i ZCW, ZPP
Titansilber Metallic, Black Interior
The 160,000 mile, clean daily driver
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