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Old 03-02-2012, 06:33 AM   #6
dmax
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Join Date: Aug 2006
Location: NJ
Posts: 23,634
My Ride: '99 328i 300K miles
Follow the hose from sap out...it goes to the valve...silver thing on exhaust side of engine, with vac hose leaving out the back...assuming, in the UK, you have this pump. The clue, so you know, is that you said the sound disappeared after two minutes...that's how long the SAP runs on cold start, plus or minus a bit.
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