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Speedometer erratic 700 1992

posted by  Bolbo on  Fri Dec 1 13:33 CST 2006
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last visit: Sun Feb 24 12:14 CST 2013
[RELATED]

I own a 1992 740 wagon with about 180,000 miles on it and the speedometer has been acting up. When driving at about 20 mph the speedometer will start to jump up to about 50 mph hour. As I increase my speed from 20 mph the speedometer slowly increases to about 60 mph. Once I’m actually traveling at 60 mph or faster, it seems to be accurate. It has never actually stopped working, it just reads too high. It usually works fine until I’ve been driving for about five minutes or so. The odometer works and I think it’s measuring the miles correctly for the actual speed I’m driving – not the speed the speedometer reads. I ran new wires from the connecter at the pick-up unit on the differential to where the wires enter the car and also removed the cluster and tightened the screws on the back of the cluster. (I did not remove the speedometer from the cluster). The green circuit board on the back of the cluster doesn’t appear to have any discolorations. Neither of these helped. Any suggestion will be appreciated.

Thanks to all,
Bolbo





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