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Old 01-07-2015, 08:34 PM   #1
DG Boxster
Registered User
Join Date: May 2014
Location: New Mexico
Posts: 74
short vacuum cleaner sound - electric pump?

After a cold start, my 98 Boxster makes a vacuum cleaner sound for a few seconds. I think there is an electrically driven pump of some sort that comes on, and then goes off maybe 5 seconds later. I can see that the electrical load on the engine changes. This is only noticeable when the engine is cold.

I looked around in the Service Manual and see that there is a "Secondary Air Pump" that looks electrical. What is this for? Should I be worried about it?
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