Well i just started noticing this last week. Every time i shut my doors i hear this strange rattling or springy noise. I also hear it every time i hit a bump or rough piece of road, which is why i assumed it was a suspension issue. Its not real loud, but its noticable. It sounds almost like a bunch of little metal sticks vibrating togethor, i dont know how to describe it. Its just a high pitched 'springy' sound...Any ideas?