What is the spark plug cap on a 1988 Honda Prelude?

The spark plug cap on a 1988 Honda Prelude is a protective cover that fits over the spark plug to ensure a secure connection between the ignition coil and the spark plug itself. It helps prevent moisture and dirt from entering the spark plug area, ensuring reliable electrical conductivity and engine performance. In addition, it aids in preventing misfires and contributes to the overall efficiency of the ignition system. If damaged, it may cause starting issues or rough engine performance.