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I am glad we are talking about this as I am not 100% on this.
How can the dual connection-pot push against its internal return spring when there is boost filling both sides of the internal diaphragm. With equal pressure on each side of the diaphragm there would be not movement and thus no retard.
Running the car up in the driveway for a test is not going to work. Only on a dyno so there is boost on each side of the throttle butterfly.
To test this we just need a hand pump teed to each side of the pot so it pressurizes each side at the same time. If the distributor plate moves, the timing changes, or idle slows, it is able to retard with equal boost signals.
If not, there has to be a check valve, a solenoid, or something to block the signal on the back side of the can.
Go to post 99. There are two solenoids in the picture. One is probably for blocking the on idle vac-ret signal and the other much be for the air pump.
Also, look at that schematic. I shows the solenoid on the Vac-Retard side of the pot.
Anyone have a hand pump, at tee, and some tubing and willing to test the pot?
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