Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

There are several ways to tell whether or not the spark plugs on your vehicle need to be changed or just adjusted and replaced. How often you replace spark plugs depends on the type of plugs you have.

Though the diesel engine is the main worker on the farm, there are numerous gas power plants toiling away that also need maintenance. One crucial component, the spark plug, is often ignored, which has ...

A gas engine needs fuel, air, and spark to get its internals chugging along. Take any of these out of the equation and the engine will have a fit. While the automotive industry shifts toward fully ...

For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...