[Formulajones]

Originally Posted by Kenth

I have found that nozzle drip caused by a to lean idle circuit and too far opened throttle blades are the main issues for run on turning ignition off.

Yep, that's why quite a few cars from this era had idle solenoids or dash pots, that would kick up the idle with the key on, and back off the throttle arm when you turned the key off...so no more run on when shut down. A lot of people confused this with AC, but that's not what it was for. Then show them cars without AC and solenoids and they scratch their heads.

I see this quite a bit with cars that have large cams, and the idle circuits of the carb aren't tuned correctly for the combination, so they struggle to idle, and people kick up the idle speed to compensate, moving the throttle blades passed the idle transition slot. Basically making the car idle off the main jet (nozzle drip) Then complain of poor gas mileage and all the other issues associated with a poorly tuned carb.