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    suptclark's Avatar
    suptclark Posts: 64, Reputation: 8
    Junior Member
     
    #1

    Mar 19, 2009, 10:50 AM
    94 Grand marquis digital speedometer
    94 Grand Marquis with digital dash. Speedometer shows various speeds with car in park and engine running. Odometer and trip counters mileage advances while you sit and watch in a motionless car. Speedometer seems normal while car is moving. What's wrong?
    450donn's Avatar
    450donn Posts: 1,821, Reputation: 239
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    #2

    Mar 19, 2009, 12:06 PM

    Bad ground, weak voltage would be my two top picks.

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