We may receive a commission on purchases made from links. When it comes to engine care 101, a spark plug replacement — also referred to as a tune-up — is an essential task. Spark plugs, as the name ...

As you likely know, internal combustion engines that run on gasoline rely on spark plugs to initiate the ignition process. A high-voltage current is sent through the spark plugs, allowing them to ...

Most spark plugs come from the factory with a pre-set plug gap that is recommended for the application. Experimenting with wider or tighter gaps is one way to dial in your engine’s performance, but ...