A spark plug is a small but important part of an engine. It delivers the spark that ignites the fuel-air mixture, allowing the engine to run smoothly. When a spark plug fails, the engine may misfire, ...

Look at the tip of the removed spark plug. A spark plug should come out of an engine with a central electrode that's got a light gray or brown residue. It should be free from any oily or fluffy black ...

When most drivers turn the key or press a button to start their vehicle, they’re probably not mentally going through everything that needs to happen in order for their engine to start. And while the ...

An inline spark tester is a convenient tool that allows you to test the spark plug wires’ ability to transmit electricity while the engine is running. You can observe whether or not it produces a ...