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2G Speedometer went crazy!

Posted by BLACK'98DSM, Nov 21, 2019

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  1. BLACK'98DSM

    BLACK'98DSM Proven Member

    1,040
    337
    Joined Feb 9, 2019
    Hoover, Alabama
    So 2 days ago my speedometer decided to say I was going 170mph when I was actually going like 60. It has always been slightly ahead too. I read through some old posts about similar issues, but no one had a clear answer.

    Thoughts?
     

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    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

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  2. Kryndon

    Kryndon Proven Member

    337
    146
    Joined Jan 10, 2014
    Bulgaria, Europe
    The only time I had my speedo going crazy was when my alternator wasn't working at all and all the electrical systems were running off the battery and draining it. At one point from jumping like crazy, the speedo needle just went to 0 and shortly after I lost all power.

    So all I can suggest is checking your alternator and the wires from it, if it's charging properly etc. After that I would give your speed sensor on the trans a visual check. A friend of mine once had a similar issue, actually. He had a 420a Eclipse and had to change trans, so he swapped it with a trans from a PT Cruiser but the speed sensor was different so it was reading really high speeds because the ratios were off. But if you haven't swapped trans or sensor that shouldn't be your case.
     

    Street Build 3K  9

    1997 Eagle Talon TSi AWD
    14.769 @ 92.22 · 2G DSM
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  3. my98gsx

    my98gsx Proven Member

    494
    43
    Joined Aug 14, 2005
    Wappingers, New York
    We had this happen to my friends 97. It was bouncing like crazy... We recently did some engine bay work and forgot to re-install a ground wire. Once re-attached the gauge worked fine. If you have been working under the hood check your grounds.
     

    Street Build 602  11

    1999 Mitsubishi Eclipse GSX
    563 whp · 422 lb/ft · 2G DSM

    711  4

    1999 Mitsubishi Eclipse GSX
    12.091 @ 114.490 · 2G DSM
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