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Old 03-02-2012, 01:56 PM   #20
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Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,223
My Ride: '94 325iC & '00 323i
Originally Posted by M4RKY N View Post
No I was just wondering why it's making such a noise, and from comparing it my friends e46 and his doesn't make the sound at all... So I was just wondering. Also someone above in the thread has said to check certain things so I have done and was just writing back to say what I have found.
You ONLY get the Secondary Air Pump on the initial start when the engine is stone cold. If you drive somewhwere and park, then start again before the engine turns to a frozen chunk of steel, the SAP will not come on. If you drive to work and park all day then come out at 4:30, the SAP will start for about 2 minutes.

Some of them make a whine that sounds like a vacuum cleaner, and some make far less noise. The noise is not indicitave of a problem.
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