I have a noise that will not go away. I replaced the power steering pump & tensioner, water pump, and surpintine belt. I still have the the grinding noise. The weird thing is it is intermitent. I cannot hear it when I am sitting still under the hood reving the motor( only in the cab). I have put a long screwdriver on pretty much everything and still nothing. I know diagnosing the problem is a long shot but I am shooting for any ideas.