Vacuum Advance Solenoid

This electrically operated two-position plunger control valve serves to supply or deny vacuum to distributor vacuum advance unit. In energized position, spring loaded plunger seats against vacuum inlet and opens distributor advance unit to clean air vent. In de-energized position, plunger opens vacuum port from carburetor to advance unit. In opening vacuum port, plunger simultaneously closes clean air vent to atmosphere at opposite end. Vent to atmosphere is provided to prevent advance unit from becoming locked in an advanced position.