Cold Start Injector: Description and Operation

Cold Start Valve:

The Cold Start Valve is located on top of the intake manifold near the throttle body, it is an electrically operated solenoid type valve that sprays extra fuel into the intake manifold for several seconds when the starter is actuated and the engine is cold. The Cold Start Valve is controlled by the thermo-time switch. When the engine is cold the thermo-time switch is closed, allowing power to reach the Cold Start Valve and operate it. When the engine is warm, the thermo-time switch is open and the Cold Start Valve does not operate. To limit Cold Start Valve operation and prevent flooding, electric current warms the thermo-time switch and opens the Cold Start Valve circuit after a few seconds of starter operation.

If the Cold Start Valve fails to inject fuel during cold starting, it will be difficult or impossible to start the engine. If the Cold Start Valve leaks, the engine will receive extra fuel at the wrong time and become flooded, especially if the engine is hot.