How does a cold start injector function?

The cold start injector plays a crucial role in engine performance during cold weather conditions. When the engine is cold, the air-fuel mixture can become too lean for optimal combustion because fuel does not vaporize as effectively in low temperatures. The primary function of the cold start injector is to supply an additional amount of fuel during the starting phase, ensuring that the mixture reaches the proper ratio for effective ignition and smooth engine operation. This extra fuel helps the engine start more easily and run steadily until it warms up and the regular fuel metering system can take over.

In contrast, other functions like regulating air flow or increasing engine temperature do not pertain to the cold start injector's role. Additionally, it is not intended as a constant fuel delivery mechanism; rather, it activates specifically during the starting period in cold conditions, emphasizing its targeted function rather than a continuous operation. This makes the understanding of the cold start injector vital for diagnosing cold start issues in engines.