Spark plugs may be small, but they have a huge impact on your car’s performance, fuel economy, and reliability. Choosing the right type, using the correct tools, and following proper replacement steps ...

Spark plugs are an integral part of your engine, but they need to be replaced every so often. We'll tell you how to find out ...

If you consider your spark plugs little more than disposable engine parts to be replaced for every event or two, you're missing out on a valuable engine-tuning tool. Not only can the correct plug ...

Spark plug testers aren't entirely necessary, but they can provide convenience when you're specifically trying to figure out ...