Knocking sound from passenger floor...
 

I met up with iWrock yesterday and let him drive my misfiring car so that was interesting....but I noticed something while sitting in the passenger seat....

...Under the floor, closer to the center console there was this thumping/knocking that I could feel with my feet....It wasn't audible at all, just the thump of it.

I only felt while we were going 40Mph+. It doesn't happen on the drivers side or I would have felt it by now. Thats like the first time in a while that I've been a passenger in my own car....probably at least a year.

Any ideas?

Thanks

Center bearing support.

http://catalog.peachparts.com/RenderScriptTemplate.epc?_cmd=epccat_VehicleAAA&cookieID=2FG17RJ3A2FJ12YPAD&yearid=1988%40%401988&ma keid=MB%40%40MB%40%40X&modelid=300%2DTE%2D001%40%40300TE+Wagon&catid=K%40%40Driveshaft+%26+Axle&mode =PA&subcatid=K1030@@Driveshaft+Support&source=www.peachparts.com&clientid=catalog.mercedesshop

Also check exhaust hangers............

Ah you are right. I had to replace the muffler hangers a few months back. That is probably it.
Thanks.