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Old 01-21-2011, 01:41 PM
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JimF JimF is offline
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
Originally Posted by 96C280 View Post
I hear the secondary air pump run for the 90 seconds or so at cold startup. I do not ever notice it running again . . .
That's normal . . should run for 2 minutes or so at cold startup. The purpose is to inject "air" into a very rich exhaust. When the car warms, it's not needed again.
Regards . . . . JimF
'94 S500 Cpe

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