Spark plugs are the heart of your car’s ignition system. If yours are worn out, new ones can dramatically improve your performance. See how to replace them here.

The gap between the center and side electrodes needs to be an exact distance across; otherwise, your plugs won't fire efficiently.

Installing New Spark Plugs Most modern spark plugs come with a preset gap from the factory, but it never hurts to do a double-check and adjustment with the gap tool.

Spark plugs are essential in ensuring that your vehicle performs at its best. If yours need changed, and you want to do it yourself, here's what you'll need.

Also, if you’re working on your own car, you bear some responsibility for making sure the parts you were given are correct.

The installation of quality spark plugs and new ignition wires is one of the best things you can do for the performance and appearance of your engine. Even for those with just a flirting ...

They come in sizes that fit snugly around most spark plugs, and good ones have magnets and a bit of rubber inside to keep them from falling out when you're removing or installing plugs.

Add in the indifferent, low-energy spark and incorrect ignition timing caused by worn-out points, and you've got an engine that won't fire--oh, and wet spark plugs too.