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Registered
Join Date: Dec 2000
Location: Colchester, IL, USA
Posts: 124
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Another possibility is that you have a failing speedometer sensor on the transmission. The part is around $50 - $60 and isn't terribly difficult to replace. The wiring disconnect is beneath the tunnel access cover behind the front seats and the sensor is mounted on the left side of the transmission near the axle shaft. The hardest part is reinstalling the rubber grommet where the wire passes though the body.
These sensors do tend to go bad and the symptom that you describe is exactly how a failing sensor begins to show itself.
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Rod Walter
'88 911 coupe
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