Coasting Richer System: Description
Coasting richer system is used on Federal Man. Trans. models to prevent excessive emissions which could be created by coasting. A lean mixture, resulting from closed throttle valve for extended period of time, will create inefficient combustion. This system richness air/fuel mixture through an auxiliary fuel supply system. Coasting richer system consists of transmission switch, clutch switch, accelerator switch, and coasting solenoid valve.
NOTE:
On California models, a coasting fuel cut device is used to accomplish same purpose as coasting richer system. Fuel cut device is part of Over-Temperature Control System. See "LUV Catalytic Converter and Over-Temperature Control System" article.