What is a common issue with a spark plug that is not regularly serviced or replaced?

When a spark plug is not regularly serviced or replaced, it can lead to potential misfires. Spark plugs play a critical role in the ignition process of an engine by creating the necessary spark to ignite the air-fuel mixture in the combustion chamber. Over time, spark plugs can become dirty or worn out, which greatly affects their ability to create a strong, consistent spark.

A misfire occurs when the spark plug fails to ignite the air-fuel mixture at the correct time, disrupting the normal combustion process. This leads to rough engine performance, reduced acceleration, and can ultimately cause damage to the engine if not addressed. By maintaining and replacing spark plugs at the recommended intervals, the engine will operate efficiently and without the risk of misfires, ensuring smooth performance.

In contrast, while issues such as engine overheating and excessive fuel consumption can occur from various factors, they are not directly caused by neglected spark plug maintenance. Increased combustion efficiency is typically associated with well-maintained engine components, including spark plugs, rather than deteriorated ones.