Cold Starting System

During cold starting, additional fuel is injected into the intake manifolds by 2 cold start injectors. These injectors are controlled by the cold start relay and the thermotime switch.

The thermotime switch senses engine coolant temperature, and depending on temperature makes or breaks the ground circuit of the relay. When the starter is activated, the cold start relay is energized with the ground circuit being completed by the thermotime switch.

The thermotime switch also limits the time that the relay is energized (12 seconds max.). The enrichment provided by the cold start system is in addition to the enrichment resulting from the coolant temperature sensors' signal to the ECU.

If the temperature at the thermotime switch is above 95°F (35°C), the thermotime switch will not close and no cold start enrichment will take place.