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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 896
Good. I think that does it then. I have also found out that the vacuum electrical solenoid has to be energized to open. It is a normally closed valve. When it is cold, the temperature switch on the front, by the chain tensioner oil tubes tells the relay under the seat to leave the solenoid off.

Also, that explains how the boost retard works. The solenoid is off over 2200 RPM in all cases, which blocks pressure to the back side of the diaphram and lets the boost retard work.

Thanks911ST for starting all this. I think we've got it.
Old 04-05-2010, 02:54 PM
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