Air Injection (AIR) Solenoid
WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.
Solenoid is normally closed and consists of 2 vacuum ports with an atmospheric vent. The solenoid outlet port is open when activated and closed when deactivated. When activated, the outlet port is open to the inlet port and closed to atmospheric vent.