View Single Post
Old 11-07-2012, 12:42 PM   #27
Registered User
Join Date: May 2007
Location: TX
Posts: 4,085
My Ride: 330i
There is a "one-way" mechanical valve that connects the SAP hose to the intake manifold in the back of the engine. Since it is a mechanical valve (opens when you blow air to it, etc.), It will momentarily open under driving conditions and cause a lean condition. Ideally it should only lean out when SAP is running (when the valve is open).

Black Sapphire MetallicNatural BrownSilver Cube e46 330i ZHP/6MT - Sold
HellrotDove Grey e36///M3 - RIP
Alpine WhiteTanSand High Gloss e46 330i SlickTop/5MT - Sold
Black Sapphire MetallicNevada BrownDark Bamboo e70 X5 xDrive4.8
Alpine WhiteCoral RedAluminum f30 328i Sportline/6MT
SeanC is offline   Reply With Quote