I have a 2008 XR FWD. For about 2 months now, but only 750 miles so far. I get a sound/feeling that seems like something spins a quarter turn then stops. It comes from the driver side, engine compartment. I notice it most when I leave for work in the morning. But I also noticed it when I left work early today to stop by the Naperville, IL Saturn dealer so they could have a look. In both cases, the sound/feeling occurs after I've driven forward about 100 feet. I say feeling because it seems I can feel it through the floor boards. The service advisor said it was the ABS engaging. I've not had this same sensation driving any other ABS equipped vehicle.
Don't know if it's related, but I also hear a high-pitch vibration/rattle coming from the driver side engine compartment when I close the driver door after getting out of the car. Not slamming the door. Just a normal closing. The vibration/rattle doesn't happen when you close any other door. The service advisor said they traced the noise to the seatbelt assembly. I'm not able to trace the sound there nor can I get it to not happen if I pull the seatbelt out all the way and keep it tight. I can easily hear the vibration/rattle in my garage but it's easily masked by any sound or wind noise. The service manager said they had to take by car to a quiet location before they were able to duplicate the vibration/rattle and trace it to the seatbelt assembly. I'll keep looking for it and will take it back to dealer for a fix when I find the loose part.