Which type of spark plug issue may lead to a cylinder misfire?

A cylinder misfire can occur due to several spark plug issues, all of which can prevent the engine's combustion process from functioning optimally. Each of these issues can cause irregular ignition or incomplete combustion, resulting in a misfire.

When there is an excessive gap between the electrodes of the spark plug, it can lead to a weak or inconsistent spark. This means that the spark plug may not be able to ignite the air-fuel mixture effectively, increasing the chances of a cylinder misfire.

An incorrect thermal range is another factor that can contribute to misfires. Spark plugs need to operate within a specific temperature range to ensure that they can ignite the air-fuel mixture effectively. If the thermal range is too high, the spark plug can overheat, leading to pre-ignition or detonation. If it’s too low, the spark plug may not reach a temperature sufficient to prevent fouling. Both scenarios can cause combustion issues and subsequently result in a misfire.

Fouling of the spark plug can occur due to deposits from oil, fuel, or other contaminants. A fouled spark plug may have an insulating layer that disrupts the spark, preventing proper ignition of the air-fuel mixture. This can lead to the engine running rough or