mistergib, I am interested in your outcome. I also have this noise at startup. Took the iQ to the dealer. As expected, the service advisor said it's normal, but, with one iQ replaced and another having a short block replaced, I'm NOT convinced. I just shot an e-mail to Scion to see what they may have to say. Pretty sure they'll tell me to take it in. Just want to get some sort of paper trail going. I need a definitive answer before I'm comfortable with just letting it continue without doing anything.