Checking, replacing and maintaining your spark plugs is actually one of the easier and most affordable car-maintenance jobs you can do in the comfort of your own driveway — that is, if you don’t screw ...

In this video, learn to test spark plugs and ignition coils for a BMW using a specialized test kit. Discover how to identify a faulty spark plug, ignition coil, or wiring without a multimeter.

Cylinder misfires can turn a smooth commute into a rough, fuel‑wasting slog, and they almost always leave a trail of ...