Fast Idle - Deceleration - Control: Description

The fast idle (deceleration) control system is designed to reduce hydrocarbon (HC) emission which build up during deceleration. The closing of the throttle starves the carburetor of air, which results in an overly rich fuel mixture, causing high HC emissions. The fast idle system consists of an electronic tachometer switch (Calif.), vacuum-actuated valve, idle delay valve, throttle plate opener, and a dashpot.