Ive been hearing this irritating knocking noise from the firewall area while driving, Its progressively gotten worse. It sounds like a piece of wood tapping the fiberglass on the fire wall.
After much diassemblely I thought I found it in the rear frame cross brace. but the noise came back worse after a week. The real culprit is this thin crack that wraps around the corner of the seam between the firewall and rear shelf tunnel. When ever the body is twisted it moves about .010" and make that popping sound. its real noticeable when entering my driveway.
Any one see a crack form here? my plan is to cut into the seam a bit to make it larger and then will fill it with some fiberglass mat fibers and epoxy resin.
http://i31.photobucket.com/albums/c3...dmc/photo9.jpg
http://i31.photobucket.com/albums/c3...dmc/photo8.jpg
http://i31.photobucket.com/albums/c3...dmc/photo7.jpg