Annoying rattle on W203

[scottydee]

I have a bit of a knocking sound coming from the rear of the car - possibly just bushes and not much to worry about so no worry there.

When I have the nearside windows down (particularly the rear) there's a very "tinny" rattle that seems to be coming from the rear n/s wheel area.

I had new tyres on yesterday and took the opportunity to have a look underneath with the mechanic to try and trace the rattle. We thought perhaps a heat shield, but all the heat shields are in place with no bolts/rivets missing. I can move some of them (more flexing than moving really) but can't find anything that this could be.

Questions are: Could I pack out the space behind them to see if this is the rattle?
AND
If this cures it what would be a good thing to pack it with permanently? (bearing in mind it's a heat shield so I don't want anything to melt/burn).


Sorry for the long winded explanation, but the rattle makes the car sound awful as I'm driving along....

 

[Ted]

Does it rattle when the car is stationary?
If so, I would be suspecting the cat - very similar to a heat shield rattle.

 

[scottydee]

No. Only when moving. More so over slight bumps.

 

[scottydee]

Bump

 

[martyz]

Anti roll bar bushes,but more of a knock.Is your rear number plate loose,has
caught me out before!

 

[grumpyoldgit]

Check the parking brake cable. It runs above the exhaust heatshield and the plastic clips are prone to breaking allowing the cable to catch on the propshaft.

 

[scottydee]

I'll try have a look at that cable! Might apply it slightly as I'm driving to take up the slack....