can you tell me why my speedometer is double the speed im going on a 1990 grand prix 3.1 turbo but window display is right on

Asked by Jul 08, 2013 at 04:00 PM about the 1990 Pontiac Grand Prix 2 Dr Turbo Coupe

Question type: Maintenance & Repair

i put details in the question  what do you want to know more about

1 Answer

you need a scan tool and drive it while watching the Vehicle Speed Sensor (VSS). The sensor may be out of whack~

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