Number 4 cylinder misfire

A number 4 cylinder misfire occurs when the engine's fourth cylinder fails to ignite the air-fuel mixture properly, leading to uneven engine performance. Common causes include faulty spark plugs, ignition coils, fuel injectors, or a vacuum leak. Symptoms may include rough idling, reduced power, and increased exhaust emissions. Diagnosing the issue typically involves checking ignition components and fuel delivery to ensure proper operation.