My car engine make noise when car is in idle waiting on red light. the noise is very low it makes a cla, cla, cla noise it only happens while I wait on light and I have brake pressing down. When I put car in Park, Reverse, and Neutral I do not hear the sound. When I am driving the noise goes away. Is only when I am waiting for the light when car is stop that sound comes.

notes:
I did change timing belt water pump tensioner etc... back in October 2013

I change oil & replace all 4 tire about 3 Weeks Ago.

the noise on the engine has been going on for about 10 days. I started hearing this noise 2-3 days after I change tire and oil.

AC is Off when I hear the engine cla cla cla noise.