Hey guys- I was just reading the post about the spun rod symptoms. My car's a little different. Starting the car cold, there is a rattling sound- seems to come from under valve cover ( I guess it could be coming from anywhere but it sounds like its the under the valve cover). It's not a knocking sound but a rattling sound. It goes away after the cars has warmed up and idled for about 5 minutes.

Any of you guys know what it is? Thanks so much