Secondary Air Injection Pump - Saab 9000 Bulletin Board - Saabnet.com
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Secondary Air Injection Pump
Posted by 92saaber (more from 92saaber) on Tue, 4 Aug 2009 19:35:21
In Reply to: Loud jet sound, no fire, lots of hose issues, JoeinKnoxville, Sun, 2 Aug 2009 15:05:24
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From what I understand, it was part of emissions control during cold starts. The system would recirculate some of the exhaust back into the intake where air was pumped for about 45 seconds. I have this on my 94 CS N/A 5spd. If the hose has unplugged either at the pump or its outlet on top of the filter you will surely hear that sound as the pump runs.
posted by 74.10.243...
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