Date: Fri, 17 May 2002 23:52:47 -0400
From: zeno
Subject: Re: Violent vibration at 50MPH

Are the front disc brake rotors ventilated?..if not make sure the rotors have not warped some from heat. ---------- In article <>, Paul Halliday <> wrote: > Hi guys, > > My 1989 900 Turbo has developed a problem :( > > When accelerating, at almost bang-on 50 MPH, the car starts to make a quite > violent side-to-side shudder. This evens out at about 60 MPH and for there > up, it's very comfortable. > > I have done some considerable road testing and can confirm that it *does > not* matter which gear the car is in, or whether the turbo is used. Under > any gear/turbo condition, this vibration occurs. It also doesn't matter > whether the road is straight, curved, uphill, downhill, motorway, etc ... > > I did get the wheels tested for tracking and alignment - no fault was found, > but all the wheels did need balancing. The handling was better after this, > but has now returned to the sort of vibrations I was experiencing before the > wheels were tested. > > I have noticed a slight rattle in the N/S front when making hard left > corners and the steering does not return back to centre on it's own from a > full lock turning left. There is also a slight rattle from the front when > slowly driving off in first. > > I'm thinking drive shafts, or CV joint ... am I right, or missing the > obvious? > > I'd like to be able to point my mechanic in the right place and get this > sorted before any serious/costly damage occurs. > > The wheels are the standard 15" alloys (three spoke Aero) and the tyres > 195/60 V rated - all Michelin. > > TIA, > > Paul > 1985 900i 16V > 1989 900 Turbo >

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