Deceleration Valve: Description and Operation

During deceleration, the Electronic Control Assembly (ECA), reduces the amount of fuel supplied through the injectors until engine speed falls below 2200 RPM. When engine speed is below 2200 RPM, the ECA returns the fuel supply to normal. The fuel supply is controlled gradually to prevent engine surge. Also during deceleration, the ECA energizes the idle up solenoid to allow additional air to enter the engine.