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On my 72 BB I have a single tan wire that runs to the idle kickup solenoid mounted to the driver side of the carb. It runs power to the solenoid to push the throttle open a little when the a/c is kicked on. I'm not sure if the SB cars had similar setups. I'd post a pic but its getting a new windshield installed currently.
Okay. The carb is not the original, and the solenoid is not there. I found the original carb and there was the solenoid. They changed the carb in US before they shipped the car to me.
Cant put that solenoid on the carb I have now in the car, because its different and it does not need it.
You'ld have to check and see if all the holes etc are there for fit
If the car is running fine and not dieseling when you turn it off or quitting if you turn the AC on when at idle maybe don't worry about it.
The idea was that (for non AC cars) it would bump the curb idle up a couple hundred rpm with the solenoid then when you turned the key off it would drop fully and prevent run-on
For the AC, it would push the rpm up a couple hundred RPM with the AC turned on so the extra load didn't kill the motor at idle (not sure why those didn't run on.....)
M
All of that 'throttle manipulation' was because GM connected the vacuum advance can to "ported/timed" vacuum, rather than "manifold" vacuum. You DO NOT want the advance can connected to ported/timed vacuum. It retards the timing, causes the engine to run hot at idle, and required "throttle manipulation" to prevent engine run-on, etc. etc.
Plumb the advance can directly to a manifold fitting, as the engine was designed and it will run much better....especially at idle. And, since you actually have the original Q-jet carb, do yourself a BIG favor and rebuild the carb to original specs; then put it back on the car (if the spread-bore intake manifold has not been changed). A properly operating Q-jet is 'light-years' ahead of any other carb brand (unless you are strictly racing the car).
