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

Spark Plug Wire Puller (For older vehicles without coil packs) Multimeter (for resistance test) Spark Plug Socket Sockets (for cars with coil packs) A spark plug that’s known to work ...

Check, replace and maintain the spark plugs in your car or motorcycle with this easy guide.

A tech article on testing and reading your spark plugs. Find all the details inside Circle Track Magazine.

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