Rattling Sound 735il - BMW Forum

fredrex · 08-18-2005, 09:37 PM

When I driver over rough road (NYC Streets) or something simular like train tracks. I have a rattling sound coming from underneath my car. Could that be something serious. And when I say serious, I mean costly!

4evrwyntr · 08-19-2005, 08:25 AM

Could be lose heat shields, or your exhaust hangars are bad. Is it a tinny rattling noise? Like metal on metal?

fredrex · 08-19-2005, 07:02 PM

Yes It like meta on metal.

4evrwyntr · 08-20-2005, 08:27 AM

Get it on a lift and poke at your exhaust. Because you're talking about bumps though, and not at idle, it could also be brake covers (I assume they have those on 7-series)... But it could be a number of things. Where is this sound coming from? Can you pinpoint it to a side of your car, or is it just underneath?

fredrex · 08-20-2005, 06:27 PM

Just underneath towards the back if I would take a guess.

Dirty_Tool · 08-20-2005, 11:01 PM

funny thing about rattles is that they cant really be diagnosed over the net. your best bet is to get a buddy to help u and 1 of u crawl underneath it on jackstands and just figure out where its coming from. With any luck maybe its just a loose or bent heat shield on the exhaust. The reason u may need a buddy is so that he can rev the engine or do whatever it takes to try and duplicate the rattle while you search for the source, or sometimes its just good to have 2 sets of eyes and ears on the problem.
good luck

DT

4evrwyntr · 08-25-2005, 07:59 PM

IF you are afraid it could be shocks (I am serious) have someone ride in the trunk. Easier to pinpoint from there.