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Speedometer jumping around when accelerating

  #1  
Old 03-28-2017, 07:38 PM
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Join Date: Jan 2014
Posts: 6
Default Speedometer jumping around when accelerating

I have a 2000 Mazda B3000 cabplus pickup and recently I noticed when I am on the highway and I am accelerating around 60 and over the speedometer jumps all over the place (sometimes 50, sometimes 0, sometimes 60) it never reaches the proper speed that I am going. Once I take my foot off the gas the needle then rises to the proper speed limit (say 70/75) and slowly decreases normally until I put my foot on the gas and accelerate at a higher speed. It will then jump around all over the place again. What can be causing this issue?

Thanks for your help in advance
 
  #2  
Old 04-13-2017, 02:39 PM
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Join Date: May 2015
Location: Texas
Posts: 29
Default

It may be the VSS (Vehicle Speed Sensor) according to info I've found for a friends f150. I've got a 93 B2600 5spd that is starting to have the speedo bounce a little while at speed when normally it is steady. The dealer is saying mine might be called a revolution sensor but I don't know for sure.
 
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