Spark plugs are crucial engine components. We prepared the ultimate guide on everything you need to know about testing a spark plug.

Every small gasoline engine has a spark plug, and this key component requires periodic inspection and testing. Learn how to do it here.

Your car's spark plugs aren't something you typically think about during regular maintenance, but they do need to be changed. How often should you do it?

Attach the spark plug to a spark plug tester, then connect the tester to the ignition wire. Start the engine and observe the ...