[eriktherod]

Mine does it, usually when I come to a stop light, no AC or anything extra running. I've noticed it more at higher temperatures (ambient, not engine).

Honestly, I don't see a problem with it. My Si would idle at 700-800rpm. Seeing this car idle at 400rpm actually impressed me to be honest. I think with direct injection (DI) this car just sprays a little to keep idle happy and that combustion results in a little extra rpm. I'm fairly sure it's an emissions thing (similar to rev-hang in the Si related to it burning off unspent fuel) that could be tuned out.

Think of it this way.. 400-1000 rpm idle bumps average out to.... 700rpm! Which is pretty much normal on a 4cyl. It just chooses to handle idle differently, which I assume is based on temperature and/or just the direct injection system.

Meaning, I wouldn't worry about it. I'm fairly sure all of them do it, it's just a matter of people not noticing when it does.