Deceleration Control System: Description

The system is used to reduce emission levels during deceleration. System is composed of deceleration valve (Bosch), air flow sensor, microswitch, deceleration relay, thermocontact, cold cut-out relay, and 2-speed relay.

Fuel injection is stopped on deceleration by equalizing pressure on both sides of the air flow sensor. This equalization is accomplished by the deceleration valve, which acts on an auxiliary circuit to the mixture regulator. When pressure is equalized, the fuel metering distributor piston is no longer activated by the air flow sensor plate lever and fuel output to injectors ceases.