If you're able to get a video clip or sound clip I could host it for you so you could post it here.
*My car has always made a clicking noise if I hold the rpm's at around 2500rpm or so, people also say it sounds like a helicopter. It's also most noticeable when I'm going up a hill and holding the rpm's. I wouldn't describe it as a knock though, so I think you have something different going on.
Last edited by apexi; 03-26-2014 at 08:58 PM..