Deceleration Control System: Description

The system is used to reduce emission levels during deceleration. System is composed of deceleration valve (Bosch), airflow 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 airflow 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 airflow sensor plate lever and fuel output to injectors ceases.