I was looking back at this post, and the cam end cap was removed to replace the VVTI filter on the driver's side of the engine. It was not difficult to do. The first step is to tear the front of the engine as if you were going to replace the timing belt or water pump. You will find that you will only need to tear it down to the point where the tensioner can be removed. Slip the timing belt off the cam. Mark the location. Remove the valve cover and the cam end cap. I forgot I did use a cam lock bolt to keep the cams from moving. Once you have removed the cam end cap, the VVTI filter will be exposed. Replace the filter and reassemble it in reverse, being careful to make sure the timing is correct.