1990 Mercury Marquis Speedometer

Tiny
SCWAYLAND
  • MEMBER
  • 1990 MERCURY MARQUIS
  • 5.0L
  • V8
  • RWD
  • AUTOMATIC
  • 160,000 MILES
Speedometer is stuck at 20mph. When I accelerate the speed is shown accurately until 40mph. Then the needle freezes and wont move until I slow down to 39mph and it will stop moving at 20mph. I tested the speedometer against a GPS and the speed is accurate between 20 and 40. What could be wrong?
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Friday, April 11th, 2014 AT 9:47 PM

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Tiny
HMAC300
  • EXPERT
Scan for codes may be a speed sensor or a bad dash
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Saturday, April 12th, 2014 AT 9:36 AM

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