Why test a spark plug? When your “check engine” light comes on —or you’re experiencing some other not-immediately-identifiable issue with your engine—there could be a variety of things ...

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

Learning how to test glow plugs ensures your diesel engine remains reliable and efficient. Here is how to test glow plugs.

Every small gasoline engine has a spark plug, and this key component requires periodic inspection and testing. Learn how to do it here.

A. No, the spark plug and ignition coil are two separate parts. The ignition coil feeds the spark plug high voltage. Q. Yeah, But How Much Does It Cost To Replace an Ignition Coil?