Strange noise from unknown location
 

Every time I go over an incredibly bumpy street there is this strange vibrating noise that follows. I've been trying to figure it out and I can't seem to. At first I thought it was my license plate moving around, but I've secured that, then I thought it was my muffler moving around and that doesn't seem to be the case. I also thought it might be some rubbing between the tires and car but everything looks fine there. any ideas? I can't seem to figure it out

it could be anything. Can you please explain more (i.e. rumbing sounds like? or front or rear of car?, what kind of mods do you have? etc...)

I've got no mods at all, It does make a rumbling sound actually

Front or back, Driver side or passenger side?

From what I'm hearing sounds like Front passenger side

how many miles? are you still under warranty?

37K miles but it's an American civic in Canada that was bought with a salvage title I don't think the warranty applies anymore lol.

Anyways, I think I found the culprit of the strange noise. It seems as if I'm missing a screw for an inner panel. This is on the bottom of where the door hinges are. On the driver's side it looks to be a black plastic screw. Does anybody know where to get this part. Also somebody please take a picture of their lower front passenger door near the hinge...

http://img126.imageshack.us/img126/8...re65cq5.th.jpg