Okay, I may have posted something about this before. My car has a little rear diff noise which is normal of the ///M diff so I've been told. BMW offered an additive for the diff which cures the noise although I declined this as it seems this will make the diff less efficient. The noise is a kind of rubbing noise, and occassional clashing of the ceramic disks inside the diff. I just live with it now as I only really notice it with the windows open.
The only reason I mention the above is because the diff is at the back of the car. I'm also hearing an occassional sound as if there are a bag of spanners in the boot. Going over bumps it can sound like a metal bar is either hitting the underside of the car, or it's in the boot 'clanging' against other metal. Has anyone else experienced this sensation? it really does sound a bit like someone has a bag of spanners and are shaking the bag up and down resulting in a 'clang' when I go over bumps\potholes.
I've had a poke around underneath the battery cover in the boot and all looks secured. I've also lifted the easily removably boot cover and apart from finding some loose money that has found it's way under there(a few 5 pence pieces - my gigilo earnings), nothing else was found. I may try and remove the boot side covers this weekend to see if there's anything under there knocking about although doing that looks a little more complex.
Just wondering if anyone else has noticed the same thing and found a fix? I thought a rear spring had gone (was sure of it) but two investigations over the last 3 or 4 months has revealed the springs are just fine. What else could the bag of spanners in the boot/underside or passenger side of the car be? Sounds like it's rear passenger side.
It's not getting any worse, and driving on smooth roads is fine but on crappy roads (with potholes thrown in) I hear this 'clang', like someone shaking a bag of large spanners or a bar knocking against the body of the car.
The only reason I mention the above is because the diff is at the back of the car. I'm also hearing an occassional sound as if there are a bag of spanners in the boot. Going over bumps it can sound like a metal bar is either hitting the underside of the car, or it's in the boot 'clanging' against other metal. Has anyone else experienced this sensation? it really does sound a bit like someone has a bag of spanners and are shaking the bag up and down resulting in a 'clang' when I go over bumps\potholes.
I've had a poke around underneath the battery cover in the boot and all looks secured. I've also lifted the easily removably boot cover and apart from finding some loose money that has found it's way under there(a few 5 pence pieces - my gigilo earnings), nothing else was found. I may try and remove the boot side covers this weekend to see if there's anything under there knocking about although doing that looks a little more complex.
Just wondering if anyone else has noticed the same thing and found a fix? I thought a rear spring had gone (was sure of it) but two investigations over the last 3 or 4 months has revealed the springs are just fine. What else could the bag of spanners in the boot/underside or passenger side of the car be? Sounds like it's rear passenger side.
It's not getting any worse, and driving on smooth roads is fine but on crappy roads (with potholes thrown in) I hear this 'clang', like someone shaking a bag of large spanners or a bar knocking against the body of the car.
:evil: 
