E46Fanatics - View Single Post - Sounds like a jet plane
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Old 03-02-2012, 10:58 AM   #11
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Join Date: Jun 2011
Location: Flint, N.Wales. UK
Posts: 301
My Ride: 2000 BMW E46 Coupe
Originally Posted by dmax View Post
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.
I have checked both pipes that are coming from the SAP and one seems a little more easier to squeeze than the other, but there really isn't much difference in the two. What do you suggest? I am able to push either side of the pipe in and they touch each other, but just barely.

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