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Old 04-07-2009, 12:36 PM   #1
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Help. Humming sound on cold start

When starting my 1999 Boxster during cold start (when the car has been sitting for 2 or more hours) there is a humming sound located behind passenger side on right. This humming is loud as if a small motor or pump is running, then shuts off after around 1 min.

Does anyone know what this may be?

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Old 04-07-2009, 12:44 PM   #2
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Has it always done this? It sounds like the electrically-operated secondary air pump, which normally runs for a specified time following a cold start.
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Old 04-07-2009, 01:06 PM   #3
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Maybe it has but I,ve only noticed it in the last week and a half. Could be the pump is just getting louder because of age. Is there a secondary air pump in that location.

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