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Old 09-29-2012, 08:49 AM   #32
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
It may be an issue with the SAP. Check that the pump runs, check valve opens, hoses aren't cracked, and the valve opens under vacuum. Bavauto has a nice writeup detailing the system and how to troubleshoot.
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