PatSC23

Does anyone notice a rattle/clunking as if something is loose underneath the car when going over raised bumps at normal speeds?

I get this occasionally and cant tell where its coming from. Its either underneath or from the backseat - I just cant tell.

I want to try to identify it before I bring it in.

MiamiAMG

I haven't heard that on mine.

Militia

Do you also hear this rattle when you launch in M mode with a heavy foot?

bushburninc63

did you modify your headers/exhaust?

CELLryuu

I guess the best thing to do is just get under there and start rattling and banging on stuff to see whats loose. Other than the secondary cats, brackets and heat shields, we are just guessing.

You dont by any chance keep your golf clubs in the trunk do you

A-M?

yes it does on mine, what is it?

BABYBENZZZ

check your trunk, lol ive had lugnuts rattling from tire hop

Pertplus

When Im going over bumpy streets, streets that feel like San Diego just learned how to build them and decided to make them out of brownie mix, my car rattles in the back...on speed bumps or freeway or smooth streets, it sounds perfect.

brendan999

i get it on mine as well when I'm going up the ramp in the car park. Only hear it when I have the window down. Bothered me a lot previously but getting used to it after a while. Trunk is empty.

Asked the MB service centre to check on it before, but of course, they gave me some BS answer.

veedman

could be your rear diffuser being loose?

Stagger

I had the same thing, from under the rear seats. turns out i needed a new muffler MB said. took a week to get from germany, but was covered under warranty.

PatSC23

Im hesitant to bring it to the dealer until I kind of know because Id rather not have them driving it around aggressively over bumps.

For a while I thought it was stuff in my trunk (I keep some distilled water, oil, tire pump and some other stuff in a bag just in case). But I really dont think its that?

It DOES NOT happen when launching in M mode. It doesnt happen on divets in roads, but rather ONLY on raised bumps during driving.

I'll get under there and rattle some stuff around when I swap wheels but I guess IM not the only one.

PatSC23

checled diffuser - its tight. Its also a lounder clunking that what the diffuser would make I think.

C63newdude

Mine now rattles when I launch or go heavy on the gas pedal,it sounds like a metal shield lose or similar noise. It only makes the sound under hard acceleration and the sound always comes when you hit the gas and let go.