|
Regarding your distributor, 3/16 "axial movement" sounds excessive, don't think that is your problem though. One of those pots is intended to see pressure to remove dist advance, so applying Vac will likely have no effect. Search this forum for 'Ultimate 930 distributor, advance, retard, timing. On the last page 29 there is a cutaway pic for the pot. Does your rotor rotate freely by hand counterclockwise? Should feel some spring tension that is your mechanical advance.
Those Vac valves are just solenoid air valves, so 12v power on will allow air to flow through power off will close one port but leave one port open to atmosphere. The lower one in the pic the dist pot still is allowed to vent through the valve, but closes the port to the throttle body.
__________________
87 930,
|