Has anyone had the Problem involving the ticking or knocking from the heads? I think my car may be having this problem. I have taken it to the dealer and they changed the cam phaser which did not solve the problem. It is an intermitent knock, once it starts it will not go away until you cut the car off and crank it back up, then it's fine for a while. The noise sounds like something tapping in the passenger side head. Any ideas??