I noticed a chattering noise at start up a few different times. I have researched this as it seems the dealer fails to duplicate this when people take it in. Some say its no big deal and others are frustrated. I just purchased my rebel about 2 months ago and was wondering if any of you have noticed. I happen to be parked by another guy last night when I shut my truck off. We chatted for probably more than an hour. I started my truck and you could hear a chattering noise for about 2 seconds and then it went away. It was pretty noticeable since his truck was parked by mine and the sound bounced off his vehicle. I shut it off and then started it again and nothing.