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Old 04-03-2011, 03:50 PM   #1
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Join Date: Aug 2002
Location: Torono
Posts: 288
Why does the SAP whistle?

Why does the secondary air pump (SAP) whistle for apprx 60 seconds? And does the SAP kick in every time the car is started or only during cold weather/cold engine.

Last edited by Ahctuning; 04-03-2011 at 03:53 PM.
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