Mechanics

EXCESIVE VIBRATION AT SPEED

1998 Vauxhall Vectra

Shakes or Wobbles problem
1998 Vauxhall Vectra Manual 89000 miles

Vauxhall Vectra Estate 2.0 LS. Have recently noticed that car vibrates (even shakes) when driven at speed. As a general rule this occurs between 70-75 mph but has occured at lower speeds (65+) dependant on road surface. Once travelling above 75/76 mph the problem disapears and ride is fairly smooth. While I have no more difficulty controlling the vehicle whilst shaking occurs, it can be extremley uncomfortable. At first, I thought it may be tracking or allignment, but have not experienced any steering wobble or instances of pulling to one side. At roughly same time as problem first occured I also noticed a knocking from the rear of the vehicle when turning right at speed (such as on a roundabout), is it likely the two are related? If anyone has any ideas on the possible cause, I would be very gratefull.
Being very much a novice when it comes to mechanical matters, I always try to seek some advice before visiting a garage.
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TheNewGodOfWar
March 30, 2009.




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