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 ...

A Chinese astronaut has reported hearing a strange “knocking” sound in space – and no one is quite sure what it is. The rest of this article is behind a paywall. Please sign in or subscribe to access ...

So I was at a stop on this back road, and as I went foward and turning right, I hit a small but fairly deep pot hole. It made a nasty sound, but I didn't think of it much as I've hit pot holes before, ...

I drive a 2009 Honda Pilot Touring 4WD. I hear some knocking when I start the engine. It eventually becomes relatively quiet after a minute or two. Would it be a good idea to start using synthetic oil ...

A car mechanic has revealed that a strange knocking noise from your car could be much more serious than you may think. Simon Cheatle, mechanic at Walsall Wood Tyre and Service, said the noise could ...

I've got a 6 year old JBL 10" subwoofer (home theater sub, not a sub for a car) that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver. The sound is ...