That rhythmic knock under the hood could mean five very different things.

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, ...

Engine knocking can result from one of several issues involving your engine. Whatever is causing it, it must be dealt with immediately so it doesn't become any worse. The knocking is a warning sign ...

My 2011 Mazda 3 suddenly developed a knocking sound in December, which sounds like it is coming from the back passenger side of the car. The noise is intermittent and it does not matter what the speed ...