Guys, I have a lot of rattling in my car. I have tried giving my car to the A.S.S. more than once but it has been of no help. So I thought of doing some DIY & need some pointers from you guys. The rattling occurs only on rough or wavy surfaces. 1) The bigger sound is coming from the rear. I thought its the aftermarket parcel tray. Its an MDF tray. My car has an aftermarket ICE. Then i thought its the warning triangle. I cant seem to understand where the sound is coming from. 2) A slight grrrrrr sound coming from inside the dashboard.