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348 speedo working sometimes

Discussion in '348/355' started by crashwilliams, Jun 20, 2008.

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  1. crashwilliams

    crashwilliams Rookie

    Nov 24, 2005
    39
    Oklahoma City
    Full Name:
    Robert Williams
    #1 crashwilliams, Jun 20, 2008
    My 94 spiders speedo just started working on and off. Sometimes when I start the car it works immediatly, then some times it will start working when I get up to 50/60 mph+, and other times it will not do anything. I have mid 36K miles, have stabilant-21 the connections at both where the sensor attachs to the transmission and also the huge plug on the back of the instrument cluster. I hate to spend $220 for a new pulse generator/speedo sensor if there may be another option to try first. Plus it looks like a bear to get to if I need to remove it. Any ideas will be appreciated.
     
  2. rimoore

    rimoore Formula 3

    Nov 18, 2004
    1,353
    Island in Maine
    Full Name:
    Richard Moore
    #2 rimoore, Jun 20, 2008
    I just did a R&R of mine and it takes less then 10 minutes to pull the entire dash and remove the Speedo. Mine was flaky too and I sent it to Palto Alto Speedometer. They did a two day turnaround for about $200.
     
  3. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,068
    socal
    #3 fatbillybob, Jun 21, 2008
    Oil fouls the sensor connection at the gearbox. Rocks hit the connection and fouls it too. So does corrosion and time. Lift the rear of car look lower left of gearbox see speedo connection. Disconect clean pinch the connecoter for a tight fit and re connect. Now try it.
     
  4. fxdwgs

    fxdwgs Formula 3

    Aug 22, 2006
    1,016
    Sjobo, Sweden
    Full Name:
    Bengt
    #4 fxdwgs, Jun 23, 2008
    I had the same problem, but it was the sensor itself. Not only the connections.

    It is a cheap piece and easy to change. Costs 100 USD or so.

    Good luck!

    //B//
     
  5. vvassallo

    vvassallo F1 Veteran

    Aug 4, 2006
    8,329
    Palos Verdes
    Full Name:
    Vince V
    #5 vvassallo, Jun 23, 2008
    Same here on my old Spider. Just replace the worn part.
     

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