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, bad ...

How to test a spark plug Although this is something you can certainly leave up to the professionals, it’s also simple enough to do at home.

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