delapoer

I have a problem which appears to be unbalanced wheels but I have had them balanced and it still occurs. At speeds between 65 - 75 mph I get a vibration occurring. I have tried swapping wheels but it makes no difference. These are the "holeless" alloys on a 2002 2.2 HDi SX. I have read that there was a wheel recall on C5s - is this connected? My dealer doesn't know the cure and the mechanic has the same problem. I have considered that the wheels are not being balanced properly, that the discs could be warped (but it doesn't get worse with braking) or that there is something wrong with the column (which was replaced about one year ago). The wheels are undamaged as are the tyres from what I can see. Any fixes or suggestions? It ruins an otherwise very smooth ride. Joe

I had a similar problem, my dealer changed the ECU but it made no difference (they did not charge me). They eventually cured the fault by rerouting the turbo vacuum pipe to a place closer to the vacuum source. I have had no problems since then except that the car seems to use more fuel.....it might be my driving though. They thought it could be a very fine crack in the pipes somewhere.