My 91 740 T wgn has an odd noise. A whale type whine varies in pitch, notice only in very cold (-15C)& 40 kph while accelerating/decelerating only. The sound really floats around the rear of the car.
It is not the brakes, engine, turbo. It is in the rear axle or driveshaft I guess. It is not noticeable when the car has been parked in a heated garage for 8 hours. But it is very noticeable when the car has been parked outside in -15C overnight. Sound lessens as car is driven more +30min @ 80 kph+.
Any ideas would help.
ibs740
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