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 come in many different types, but they also have many different heat ranges. Here's what that means, as well as ...

Reading spark plugs for clues to your engine's health and state of tune 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 ...