So I have a 2002 Kia Rio and I have an engine noise I've got that is starting to not only annoy but worry me. It is sort of like a clicking or tapping noise that is coming from the top of the motor and not sure what it is. The car runs and drives fine despite the noise. I'm thinking it is a valve from the valve train that is either misadjusted or something. Any ideas on how to determine what it is without having to spend a fortune on a inspection? Or is that probably my best option to have it looked at?