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Speedometer PROBLEM

Discussion in '308/328' started by 89 FERRI, Aug 29, 2010.

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  1. 89 FERRI

    89 FERRI Guest

    Jul 31, 2010
    86
    Cold Spring Harbor ,
    Full Name:
    Elliot Siegel
    #1 89 FERRI, Aug 29, 2010
    My 1989 328 has a speedo issue , I have 8000 mile on my recent purchase , the speedo will not go past 40 MPH ,no matter what speed I am going ?? Any IDEAS ?? Thanks Elliot 516 528 5010 , [email protected]
     
  2. Darolls

    Darolls F1 Veteran
    BANNED

    Jul 2, 2003
    7,782
    Full Name:
    Sparky
    #2 Darolls, Aug 30, 2010
    Last edited: Aug 30, 2010
    May need a new impulse generator? Usually, it will work sometimes and not others; or not at all.

    Might need a new speedo or at least a refurbish. :(

    First, check the connectors at the impulse generator. Problem may just be some dirty connections.
     
  3. gerritv

    gerritv Formula 3

    Jun 18, 2001
    1,400
    St Catharines
    Full Name:
    Gerrit
    #3 gerritv, Aug 31, 2010
    Last edited: Aug 31, 2010
    No guessing required, test and diagnose.....
    Is the odometer moving at the correct rate? If so then it is likely not the sender.The symptom you describe is very similar to a late style speedo being used with an old style sender (old was 4 pulse per turn, new style is different pulses and at 8 per turn. I bought a used Dino speedometer, but it turned out to be new style inside with a Dino faceplate. Doesn't work with old style sender. If that is your situation we could do a swap?

    You can test the speedo using just a sound card output and a free piece of software. Search for speedometer and my name. Rjay and I posted lots of stuff on the old style speedo circuits and their testing.

    Gerrit
    http://dino308gt4.com
     

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