Engine knocking, or detonation, occurs when fuel in the cylinders ignites unevenly, causing metallic pinging sounds, reduced power, and potential engine damage. Key causes include low-octane fuel, ...

KNOCK, knock, knock, knock. No it's not the neighbour at the door. It's the disturbing sound of piston slap coming from your car or truck's engine. Is it a problem? Maybe -- it depends on whom you ...