[928uk] Vibration

[JDSPorsche928 at aol.com]

In a message dated 06/01/04 12:18:09 GMT Standard Time, ROBINM at matthey.com 
writes:


> I have a 1991 S4 which is suffering with vibration at 2000rpm and 3000rpm. 
> A local Porsche centre had the car and after changing all HT leads, 
> ditributor caps and rotor arms due to a miss-fire the vibration remained. They also 
> checked the torque plate and alternator which were both fine. They suggested 
> that the vibration is from the drivetrain and said it would cost approx £4k to 
> investigate further (remove gearbox, diff, axle etc) and could not garauntee 
> that the this would solve the problem. Has anybody experienced similar 
> problems or got any ideas?

I would suggest having the injectors removed, flow tested, ultrasonically 
cleaned and retested. This cured a very similar problem on my car. 

Are the engine mounts OK ? (not collapsed)


John
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