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TR speedo pegged at 200MPH, affecting odometer

Discussion in 'Technical Q&A' started by johng, Apr 1, 2006.

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  1. johng

    johng Formula 3

    Oct 23, 2004
    2,298
    northern va
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    john g
    #1 johng, Apr 1, 2006
    i started the car today, and soon after i got rolling the speedo pegged at 200MPH and stuck there. this had the unfortunate effect of causing my odometer to rack up the miles as if i were going 200. so my 8 mile trip turned into a 60 mile trip on the odo. is this a problem with the sending unit or speedo itself?

    thanks in advance
    john
     
  2. barabus

    barabus F1 Rookie

    Aug 22, 2004
    4,777
    12 Cylinder Village
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    Si
    #2 barabus, Apr 2, 2006
    You weren't driving through AREA 51 by any chance :D:D:D
     
  3. PeterS

    PeterS Five Time F1 World Champ
    Silver Subscribed

    Jan 24, 2003
    52,622
    Goodyear, AZ
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    PeterS
    #3 PeterS, Apr 2, 2006
    Try tapping on it while the car is in idle / slow driving.
     
  4. Llenroc

    Llenroc F1 Veteran
    Rossa Subscribed

    Jun 9, 2004
    5,558
    Colorado
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    Vern
    #4 Llenroc, Apr 2, 2006
    Just my thought but I would say the speedohead but, disconnect the sensor on the transaxle(it's located on the front) and see what that does.
     
  5. tbakowsky

    tbakowsky Two Time F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    20,038
    The Cold North
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    Tom
    #5 tbakowsky, Apr 2, 2006
    Just had the same thing happen to me in a 328. I found it to be an issue inside the speedo itself. The gauge is still at the repair shop I use for electronic components, I'll let ya know tomorrow what they found.
     
  6. RASCO

    RASCO Rookie

    Nov 4, 2003
    8
    #6 RASCO, Apr 3, 2006
    It is the speedometer will need to be replaced or rebuilt. I had this problem a couple of years ago.
     
  7. johng

    johng Formula 3

    Oct 23, 2004
    2,298
    northern va
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    john g
    #7 johng, Apr 3, 2006
    thanks for all the help. i'd rather rebuild it rather than replace it.

    yeah, i tried tapping--it was the first thing i did!--didn't work though.

    john
     

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