New VS Old 340 6-pack

rklein383 said
I believe the idle solenoid when energized opens up the butterflies to the idle setpoint. When the solenoid is deenergized by turning the key off, the butterflies close completely and helps prevent engine run on.

I have an old six pack and have not ran an idle solenoid for over 15 years and have had no problems with run on so I don't know if it is really necessary.

Rod

This is exactly what the solenoid is for, it is called an anti-dieseling solenoid.

66dartgt, you are right solenoids were also used to compensate for rpm drop on A/C equipped cars but in the case of the 6-pack or 6-barrel cars you could not get A/C. So you were right that it probably does not apply to this.

Chuck