2009 Odyssey EX-L with 150,000 miles. Van started making a fairly loud rattling sound. At first I thought it was the timing belt tension pulley had went bad, very similar sound. However, the sound seems to be coming from the top front of the engine probably inside the valve cover. I've read a lot of the forum info on cylinder misfires, blinking CEL, VSA light and valve adjustments but couldn't find anything related to catastrophic failure of a valve/camshaft that would cause a loud rattling sound. The other strange thing is if not for the issues stated above, the engine starts right up and seems to be idling fairly well. I'm guessing my next course of action is to pull the valve cover but just thought I might get some input from this forum on what I will probably find. Thanks.