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. You want to watch ...

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 ...

In this video, I’ll show you exactly how to test your BMW spark plugs, ignition coils, and coil wiring without needing a multimeter—just using the kit provided. Whether it’s a misfire ...