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Old 11-22-2003, 10:29 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,359
You may have an air pump(serpentine belt driven) and if so, it's likely above the alternator.

This device can cause alot of racket at first start up in the morning. It's supplying additional air to the exhaust. Compliments of Ralph Nader. The noise it generates usually kicks off about 2-3 mins after the car has been started. This may not be what you're experiencing...thought I'd mention it.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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