What is meant by “engine misfire”?

• A. A condition where the engine runs too hot
• B. A failure in the fuel delivery system
• C. A condition where one or more engine cylinders fail to fire properly
• D. An issue with the spark plug only

Answer: (C)

An engine misfire refers to a situation where one or more engine cylinders fail to ignite the air-fuel mixture as intended, resulting in a lack of power or a rough running condition. This can cause uneven engine performance, vibrations, and increased emissions. When a cylinder misfires, it doesn’t contribute to the engine's power, which can negatively affect overall engine efficiency and performance.

The misfire can be caused by a variety of issues, such as problems with the ignition system, fuel delivery, or even mechanical issues within the engine itself. However, the defining characteristic of a misfire is specifically that one or more cylinders do not fire or ignite as they should.