Without a spark plug, your gas-powered lawn mower won't work. When it's time to replace, does it matter what type you buy?

Spark plug compatibility involves more than finding a part that fits. Engine specifications reveal why similar plugs serve ...

Spark plugs are small car components, but they play an oversized role in keeping your engine running. It's critical to know when they need replacing.

Gas-powered internal combustion engines need spark plugs to (literally) ignite and complete the combustion stroke, enabling the motor to produce power. They may seem unusual to the untrained eye, but ...