Knocking sound at idle (video)

[wr4th]

im an idiot and cant figure out what would be the cause of this

http://www.youtube.com/watch?v=FqioXesTgBg&feature=youtu.be

its an iphone video, so bare with me.

[di-devol]

It's a private video, so we can't bear with you.

[wr4th]

try again..