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Date: Fri, 30 Aug 2002 21:20:35 +0200
From: "Johan Beikes" <j.beikesnopsamdoo.nl>
Subject: Re: Vibration Between 50 and 60 MPH :(


Hi Paul, You didn't mention this, but i assume the vibration is independent of the engine RPM, i.e. independent of the gear? Johan "Paul Halliday" <pjghnopsamyonder.co.uk> wrote in message news:B993F117.2A1E%pjghnopsamyonder.co.uk... > Hi again, > > ..... after a couple of garages and some (more) work, this problem is still > here with my 1989 900 Turbo (see older postings). The car vibrates from > side-to-side quite violently between 50 and 60 MPH. This vibration is not > present at any other speed and does not occur when slowing down. The > vibration is more noticeable when the turbo is boosting. > > I have had the front-end looked over by two garages now. There is nothing > wrong with the wishbones, ball joints, tie-rod ends, CV joints, drive shafts > (replaced recently), wheel bearings, wheels (not bent or out of shape) or > tyres (all four the same make, age and wear). All the wheels are perfectly > balanced & aligned and the car is tracking correctly. The engine mounts are > fine as well - the engine block is practically static at idle. The brakes > are all good - no scraping or other odd noises during driving or braking. > All fluid levels are correct and otherwise, the car drives fine. > > What else could it be? > > I does seem that the vibration gets worse as the car warms up ... it isn't > that noticeable when accelerating through 50-60 MPH within the first 5, or > 10, minutes from a cold start. > > There is quite a lot of belt noise when starting from cold, but this > disappears after about 20 minutes of driving. The power steering wheel (the > belt driven thingy - I'm not that mechanical) does have a slight nick in it > and the belt does move a couple of millimetres when rotating). > > I have also noticed a slight "pop" when moving just off centre to the left > which is felt though the steering wheel. Could the power steering be at > fault? Could the rack cause this odd vibration? > > TIA, > > Paul > > 1985 900i 16V > 1989 900 Turbo S > http://pjgh.go.dyndns.org/saab/index.html >

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