high idle on hot start up
04-07-2008, 04:48 PM
#16
Burning Brakes
Join Date: Apr 2006
Location: Central Washington State
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[QUOTE=JFairman;5288873]My '87 has that little thermo gadget in the vacuum advance line too. I think it holds back vacuum advance until the engine case starts to heat up, but why... I don't know. I guess it's emission control oriented.
Then to complicate it more there's also a vacuum solenoid in the vacuum advance hose a little farther down the line... I think that one shuts off the vacuum advance at full throttle or near full throttle via the throttle position switch so vacuum advance doesn't interfere with the boost retard transition in the distributor pots...QUOTE]
Damn, another level of complexity. I guess I never noticed either gizzmo last time I had the engine out and could see everything. Thanks for sharing your knowledge.
Then to complicate it more there's also a vacuum solenoid in the vacuum advance hose a little farther down the line... I think that one shuts off the vacuum advance at full throttle or near full throttle via the throttle position switch so vacuum advance doesn't interfere with the boost retard transition in the distributor pots...QUOTE]
Damn, another level of complexity. I guess I never noticed either gizzmo last time I had the engine out and could see everything. Thanks for sharing your knowledge.
