Which of the following symptoms indicates a problem with the spark plug delivery?

The indication of a problem with the spark plug delivery is closely related to the role that the rotor arm plays in the functioning of the ignition system. The rotor arm is responsible for distributing the high voltage from the ignition coil to the appropriate spark plug at the correct timing. If the rotor arm is defective, it may not properly direct the electrical charge to the spark plugs, leading to insufficient or erratic spark delivery. This can result in misfiring or an inability to start the engine, signaling a direct issue with the spark plug delivery system.

In contrast, while the other symptoms may point to various engine issues, they do not specifically implicate the spark plug delivery. A weak battery signal typically indicates problems with the electrical system or battery health rather than the ignition components. Excessive smoke from the exhaust might suggest issues such as oil burning or fuel mixture problems, reflecting different engine complications. Unstable engine temperature can be linked to cooling system failures or thermostat malfunctions rather than any direct issue with spark plug operation. Identifying a defective rotor arm is crucial for ensuring effective ignition and proper engine functionality.