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, ...

A knocking sound from the engine often triggers worst-case assumptions, but piston slap is a far more common—and usually less dangerous—culprit. It occurs when a piston lightly contacts the cylinder ...

...Or, so was said to a mechanic by this lady. <BR><BR>This story was relayed to me by one of my friends @ work who used to work in a garage. The master mechanic that worked there, told him this story ...