1988 GTS speedometer issue | FerrariChat

1988 GTS speedometer issue

Discussion in 'Technical Q&A' started by BogieBill, May 31, 2011.

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  1. BogieBill

    BogieBill Rookie

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    My 1988 GTS is a low miles car. The speedo recently started to jump-fluxuate and finally went dead. Anyone know what might be happening?
     
    BogieBill, May 31, 2011
    #1
  2. PAP 348

    PAP 348 Ten Time F1 World Champ Lifetime Rossa Owner

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    Pull apart and clean all the electrical connnectors with some electrical cleaner. Stabilant 22 is really good. :):)

    Try that first, if that doesnt fix it there maybe a ground issue. :):)
     
    PAP 348, May 31, 2011
    #2
  3. CarbBoxer

    CarbBoxer Formula Junior

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    CarbBoxer, May 31, 2011
    #3
  4. sparta49

    sparta49 F1 Veteran Owner

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    smack the top of the instrument cluster (really)
     
    sparta49, May 31, 2011
    #4
  5. f355spider

    f355spider F1 World Champ Owner Rossa Subscribed

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    +1. Then consider replacing the speedo sender, screwed into the transaxle. I have owned three Ferraris, including a 328, all of them needed a new sender at some point in my ownership. If it really is the speedometer that is bad, then yes, try Palo Alto Speedometer for the repair. But I would start wtih checking connections, then replacing the sender.
     
    f355spider, May 31, 2011
    #5
  6. f355spider

    f355spider F1 World Champ Owner Rossa Subscribed

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    On the 328, it is more common to have issues with the tachometer or the clock.
     
    f355spider, May 31, 2011
    #6
  7. Paul_308

    Paul_308 Formula 3

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    It's either the sensor or speedometer, the sensor is cheaper to replace than the speedometer is to fix. To differentiate, look for voltages at the sender unit located at the corner of the engine accessed by removing the right wheel well cover. One sensor wire comes from the fuse panel (check for battery 12V there with key on) and the other wire goes to the speedometer (check for a 6v square wave swing here with each wheel revolution). Chuck front wheels, raise the left rear wheel off the ground with the engine in neutral. Turn wheel, read voltmeter.

    Elsewise throw money starting with a new sensor.
     
    Paul_308, May 31, 2011
    #7
  8. yelcab

    yelcab F1 World Champ Consultant

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    my 89 was like that. It would not work in the morning, and start working again at the same spot on the freeway every time. Finally died for good. A change to a used speed sender fixed the problem.
     
    yelcab, May 31, 2011
    #8
  9. Darolls

    Darolls F1 Veteran BANNED

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    No need to remove the wheel well and wheel. The impulse generator is easily accessible from underneath the car.
     
    Darolls, May 31, 2011
    #9
  10. anxpert

    anxpert Formula Junior

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    Worked for me , gave the top of the instrument cluster a couple of open handed strong taps .... speedo started working again.
     
    anxpert, Jun 2, 2011
    #10
  11. Darolls

    Darolls F1 Veteran BANNED

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    I believe that's the Ford diagnostic test! ;)

    Worked for me when I had a a dash light problem on a Ferrari. Helped me find a loose ground by pounding on the dash.
     
    Darolls, Jun 3, 2011
    #11

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