oh that could be a possibility becuase i tried to see if that sound was al ways constant and i would turn off the car then restart in like 5-10 seconds..I just tried to get the sound down on camera, but my camera phone doesnt pick that sound up. I even tried to rev my engine up to 4000 rpm and the camera phone didnt even pick it up.. So what do you think worst case scenario is being that we ruled out a rod/piston knocking.....