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

While many drivers will be fine leaving their spark plugs set up the way they arrived, there are certain situation that might require some adjustments.

Piston-engine aircraft use more than one spark plug per cylinder, and for good reason. Beyond performance gains, it all comes ...

Gasoline and diesel engines work on similar principles, but there are some important differences, including the fact that diesel engines don't need spark plugs.