Cold Start Valve

The cold start valve provides additional vaporized fuel during cranking mode to improve cold engine start-up. This circuit is required due to not enough fuel for cold engine start.

The starter solenoid supplied circuit is activated only during cranking mode. A thermal switch provides a valve ground path when engine coolant temperature is below 95°F (35°C).

Thermal switch consists of a bi-metallic material which opens at specified coolant temperature. This bi-metallic material is also heated by the thermal switch winding. This allows the valve to remain on for 8 seconds at -5°F (-20°C) coolant temperature.

The thermal switch closed time varies with coolant temperature. As coolant temperature rises, cold start valve operation time decreases.