Pboden

I am assembling the air intake and have lost track of where the vacum hoses at the pictures is going. I find a little difficult to figure out the vacum hose diagram that is available, so a little help would be appreciated.
They are the two lines from the valves on the right side of the car, just under and beside the watertank. Black and white.
Are the black going to the one point under the intake or at the pair on the top ?

WallyP

Tough to answer without knowing the model year...

For most years, there is a vacuum diagram on the lower side of the hood.

Pboden

Sorry, its a -87 S4.

No diagram to see on the hood.
Trying to salvage a tired version of this beutiful car, and I need some help during the restoration.

WallyP

The larger valve goes to the nipple closest to the air inlet.

The smaller valve (the blow-off valve) is shown on the vacuum diagram as attaching on the very front of the intake plenum (opposite end from the air intake).

Pboden

Iam sorry WallyP, but what do you refer to as the larger valve, the black or the white one?

Thanks

NoVector

This might help - From Roger's "how to" guides:
http://s287999742.e-shop.info/online...IAGRAMS+S4.pdf

worf928

Search is your friend. Find Dwayne's intake refresh write-up. Or use mine (available from 928oc or 928 International sites.)

Short story:
first red circle is your tank vent valve. It is connected to the vacuum source that faces front on top of the throttle body.
second red circle is the air pump valve. It is connected to the vacuum source on the bottom of the throttle body.
the vacuum source on the throttle body that faces the rear connects to the 5-way splitter that feeds the fuel pressure regulator and dampeners.

Why is your throttle body blue?