3-Way Solenoid

This electro-vacuum valve has connection from intake manifold vacuum and to servo diaphragm. Solenoid portion is energized and de-energized by electrical connections to engine speed switch (air conditioning relay on models so equipped) and ignition switch. As engine speed switch determines that engine speed is over 1000 RPM (1100 RPM for Calif.), it will open 3-way solenoid to allow passage of intake manifold vacuum which positions servo diaphragm. This causes throttle plate to open slightly.