If a spark plug fails to produce a spark, which component could be malfunctioning?

The functionality of a spark plug is essential for the ignition process in small engines. If a spark plug fails to produce a spark, it indicates that there is an issue with the system that generates the spark needed for ignition. One critical component that can directly affect this is the ground connection.

The ground connection provides the necessary electrical grounding for the ignition system. If the ground connection is poor or has failed, it can prevent the spark plug from receiving the electrical impulses required to create a spark, resulting in the engine not starting or running properly. A solid ground connection is crucial because it completes the circuit for the ignition coil, which in turn produces the spark at the spark plug.

In contrast, the fuel pump, choke valve, and throttle lever primarily pertain to fuel delivery and engine airflow rather than the ignition system itself. Issues with these components could lead to a lack of fuel or improper air-fuel mixture, but they would not directly cause a failure of the spark plug to produce a spark. Thus, examining the ground connection is the most relevant step when diagnosing a spark plug that is not sparking.