[john70t]

I wouldn't drive it until the vacuum hoses are correct and specs are known.
The 3.0l is an excellent engine but.

Grady Clay aka Early S man (?) with his extensive knowledge of tech literature contributions doesn't seem to appear on the Pelican Search...


My rusty knowledge of CIS is limited and the following could be entirely wrong:
-One hose is definitely a timing advance hose tied to RPM. More speed equals more vac to turn the points plate.

-Vacuum retard balance of the advance mechanism (due to load at any rpm) should come from the intake manifold I would guess. Highest manifold vac is at idle. 18-24 IIRC for a good running engine. I haven't wrenched in a while

-There is divot hole in the throttle plate to allow some air through. There is a manual air bypass screw which must be set correctly. 1.5-2 turns out from seat or something. I don't remember at all. There is a large air hose bypass controlled by solenoid tied to the computer.

-Fuel injector seals and especially the CIS boot have to be changed occasionally to prevent air leaks. There is a VW/Porsche tool for the first. Be careful with this and don't break anything using leverage. They will be like rocks after decades in a hot engine.

-There is the Warm Up Regulator which puts pressure on the the fuel plunger in the CIS system. I think that is heat sensor/electric but could be wrong.


Lubricate everything possible, a dab of marvelous mystery oil in the gas, and start from from scratch would be my WAG.