I found a Euro Vac Diagram and everything looks like mine "except" I never saw a Vacuum Control Valve" (#5) on my set up.
Also, if looking from above the engine, the 3 vacuum ports coming out of the rear of the Throttle Body (#2), looks like the center port goes both tho the Decel and Diverter Valves. The left port goes to the lower port on the WUR.
How do you check a "Check Valve" (#9)?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
