I have a 2002 Altima and im having a clicking niose, some what it's hard to descirbe. Its a clicking, humming type noise thats coming from the right side of the engine bay. It happens for a sec. when i start the car and then it goes away. It also happens off and on when i excelerate in the lower gears. As i speed up the noise seems to go away. I was told to try a higher grade of gas b/c i was using 87. So i tried 93 and the noise isnt as loud now. But it's still there. Can anyone help me please.