I have a vectra 2.0 dti with two problems possibly unconnected the first is an audible squeak squeak when turning the car left and right noise frquency increases as the cars speed does.

The second is more worrying when driving at speed if I lift off and then go back on the accelerator there is a thud or clatter. Felt as a vibration through the whole car

The stealers have never managed to get to the bottom of this and to be honest I am geeting a bit fed up. I have had the car up and checked most of the suspension / engine mounts for movement nothing obvious there. Any of you guys ever had a simialr problem.