Aerostar AWD V6-183 3.0L (1991)
Auxiliary Air Valve (Idle Speed): Description and Operation
Throttle Body Assembly
The Idle Speed Control Bypass Air (ISC-BPA) valve is used to control engine idle speed and is operated by the Engine Control Assembly (ECA). This
valve allows air to pass around the throttle plates to control cold engine fast idle, no touch start, over temperature idle boost and engine idle load
correction.
