Gas-powered internal combustion engines need spark plugs to (literally) ignite and complete the combustion stroke, enabling the motor to produce power. They may seem unusual to the untrained eye, but ...

Something about engine spark plugs that rarely seems to get mentioned is indexing. What is it, actually? Should you index the spark plugs on your engine?

The post How to Test a Spark Plug to See If It’s Working appeared first on Family Handyman.

The spark plugs in a gasoline engine are not universal, one-size-fits-all components. Plugs are made of a variety of materials with different electrode setups and thread configurations, and knowing ...