Has anyone had a problem with the 2.3 l kompressor engine where a second or so after starting the car there is a "grinding" noise for 1 or 2 seconds? The noise is loud enough to be heard over the engine. I've had this sound twice in the past month, both times after the car sat for 4-5 days. The sound does not appear if the car is started after sitting for a day or even two. Ideas?