banging noises under the car on diesel 306 l reg

have a banging noise under the car predominantly when the car is loaded. i
thought at first it was the exhaust as it sounded somewhat metalic but
after checking it, all seems to be intact and not loose1 i think its
coming from the back but have had a very thorugh check over the car
tightening up every nut and bolt i can find, i go ages without the noise
and then it comes back. i havent taken the spare wheel cradel out to see
if its that but there is nothing obvious about this one.
i dont know whether this is a suspension problem or not but its driving me
crazy,
any suggestions anyone

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slimback wrote:
> have a banging noise under the car predominantly when the car is
> loaded. i thought at first it was the exhaust as it sounded somewhat
> metalic but after checking it, all seems to be intact and not loose1
> i think its coming from the back but have had a very thorugh check
> over the car tightening up every nut and bolt i can find, i go ages
> without the noise and then it comes back. i havent taken the spare
> wheel cradel out to see if its that but there is nothing obvious
> about this one.
> i dont know whether this is a suspension problem or not but its
> driving me crazy,
> any suggestions anyone

It's likely to be the suspension - either..

One or more of the four suspension mounting bushes. If the rubber fails you
get metal to metal contact. If you need to replace one you should replace
the set of four.

Failing suspension arm bearings. Jack up the rear of the car and support on
axle stands. Check for play by vigorously exerting sideways force on each
wheel. If this is the problem then take a look at
http://www.sspengineering.co.uk/, whom I can recommend.

Peter