because i have the same noise and it sounds like valves. To me it sounds like, not being facetious, "rattle, rattle" and it really drives me crazy because I am really like this car and i would like to solve his.

I hope to adjust my valves this weekend. Recently i replaced my injectors which solved 70 % of my other problems and I don think this noise is injector related.

Its an irritating rattle you dont hear at full load, but during stop and go driving it is very prominent...if you have any further ideas, please let me know.