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Old 02-08-2012, 02:38 PM   #48
Registered User
Join Date: Sep 2008
Location: Fort Smith, Arkansas
Posts: 236
My Ride: 1999 328i 4dr
Originally Posted by jfoj View Post
Simple test for the SAP check valve vacuum hose is to disconnect the small vacuum hose at the SAP check valve and either blow into the hose (you may need another length of hose and a nipple) and/or connect a hand vacuum pump up to the vacuum hose that connects to the SAP check valve.

You should not be able to blow/move air in this section and/or it should hold a vacuum. This hose has and electric check valve at the other end near the throttle body.
So...if I CAN blow thru the hose or it doesnt hold a vacuum then either the hose is
broken somewhere or the electric valve is bad right?
Sorry for the confusion. I'm NOT mechanically inclined.

1999 328i E46 with a M52TU - 2002 X5 E53 3.0i with a M54 - -

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