Question about 1993 Buick Roadmaster

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93 Buick roadmaster speedometer jumping up and down then will stay around zero. Some of the time while driving in overdrive maintaining same speed, the needle jumps up then down making car down shift.

Posted by Anonymous on

  • paulmacintyre
    paulmacintyre May 02, 2015

    Sounds like a bad VSS (vehicle speed sensor) located in the transmission. It sends a signal to the computer and is then calculated into a mph signal from the speedometer. May also affect cruise control operation and turn on check engine light. It will also affect transmission performance

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  • Buick Master
  • 1,326 Answers

Faulty speed sensor

Posted on May 02, 2015

4 Suggested Answers

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Posted on Jan 02, 2017

  • 1201 Answers

SOURCE: The speedometer needle jumps up and down

Probably the vehicle speed sensor that controls the speedometer is malfunctiong and needs to be replaced. Have it checked first.

Posted on Apr 19, 2010

ZJLimited
  • 17970 Answers

SOURCE: my 95 ford tauraus rpm shifts up and down irradicly and the speedometer stopped working

Sound like a vehicle speed sensor go to bad. If this is right, the RMP dont showing details.

Posted on Feb 27, 2013

skychief2001
  • 21873 Answers

SOURCE: Speedometer jumping up and down and car will not pick up speed.

Based on your actions, it sounds like a wiring problem.
Could be a weak connection at the cluster, or the speed sensor.

Posted on Apr 09, 2013

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2 Answers

93 Buick roadmaster, replaced speed sensor already, car still did same thing


Erratic Speedometer action could be an internal transmission problem. Check the Instrument cluster, vehicle speed buffer and recheck the speed sensor, look at the drive gear inside.

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Speedometer jumping up and down and car will not pick up speed.


Based on your actions, it sounds like a wiring problem.
Could be a weak connection at the cluster, or the speed sensor.

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My 95 ford tauraus rpm shifts up and down irradicly and the speedometer stopped working


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you have a connection problem going to your intrument cluster unless your real handy working on auto`s better take it to a mechnic

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