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

You can use a multimeter to test the resistance to be sure. Q: How Can You Tell if a Spark Plug Is Firing? A: The grounding test is performed to determine if a plug is firing.

In this video, I show you how to test spark plugs and coils on any car, even if the spark plugs are recessed or hard to reach. Whether you're troubleshooting engine misfires, poor performance, or ...

Car Care: Take cars that misfire to a repair shop, where their spark plugs and ignition boots should be checked.

Keep your vehicle running in top shape by replacing the spark plug wires.

Changing your spark plugs is an essential (and relatively easy) part of car maintenance--here's how to do it.