Read a good spark plug lately? We hope so, for your engine's sake. But spark plug reading—the traditional way to check your fuel mixture and monitor other vital conditions in the combustion chamber ...

Spark plugs may be small, but they play a huge role in how your engine performs. These components ignite the air-fuel mixture ...

Side gapping your car's spark plugs could result in some modest performance gains. Here's what it means, how to do it, and ...