2000 Corolla 1.8 148k. While cleaning the throttle body, gave it a few revs, heard a strange noise. Best way to describe it is like a piece of metal or tin vibrating on top of a lifter. Looking down the oil filler hole, I can see directly to 2 of the lifters, with no baffle obstruction (cant see anything but baffle in my other cars). Before I unnecessarily tear the valve cover off, can somebody tell me if there should be a baffle at the bottom of the filler hole for these years?