If my Juke has been sitting for a few hours I hear an odd sound when I first start the engine. Sounds like plastic or rubber moving against each other. A rather hollow low pitched sound. As a guess I'd say it was something vacuum operated that moves when vacuum builds. That would explain why I hear no such noise if I shut the engine off and restart after only a short time. Anyone else hear something similar? Just wondering if its normal or something for the dealer to look at.