Quote Originally Posted by Golf Loon
How did you test the one way valve?
Took out the valve altogether and plumbed direct. For some reason Audi has a complex vacuum takeoff from 3 points on he intake side. The valve itself is actually mounted on a "T" and only operates on 1 of the 3 hoses that go to the manifold Duh... Should have taken a pic. But anyway, it made no difference so I put it back.