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Speedometer issue 700 1991

Hey all,


I think I'm having the problem with the speedometer in my '91 740 (NA). As you may know, this is a car I've owned, loved and faithfully maintained for the last two years, having purchased it from the original owner. It currently has 166k miles and still runs like a champ.

The speedometer is a different story, though - I noticed the issue while driving home from dinner tonight. Between 0 and 45 mph, the speedo works just fine. However, something strange happens when accelerating up to highway speeds - I notice that while the car keeps going faster, the speedo needle goes up to just 45 mph and stays at 45 mph. I can still accelerate to 60 and beyond but that stupid speedo needle stays at 45. The odometer and trip odometer function normally. Is this an electrical issue or is it the speedo cable? It is annoying the heck out of me and I want to fix it soon.

Note - I have had issues with the speedo since I bought it - it works fine most of the time, but a lot of times, both speedo and odometer just stop working and will not work for a number of weeks. Then they both start functioning again all by themselves. The speedo staying at 45 mph even at highway speeds is definitely bugging me though.








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    Speedometer issue 700 1991

    Yes, I recognize this as an electronics problem inside the gauge. The motor that drives the needle is made from two coils in quadrature; if one is not driven, you'll see it top out at 45 mph.

    Because there were several mentions of this problem, I proved it when doing this analysis a few months ago:

    Yazaki speedometer notes

    If you are OK with 'lectric stuff, you can fix this. If not, send it to one of the firms recommended in the other posts.
    --
    Art Benstein near Baltimore

    A successful diet is the triumph of mind over platter.








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    Speedometer issue 700 1991

    i had issues with my cluster last year. i sent it off to this company. they fixed it up right and i highly recommend them

    http://www.southernelectronics.com/

    andy








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    Speedometer issue 700 1991

    I had the same trouble. Removed the speedometer and sent it off to Overseas Speedometer (www.speedometer.com) in Austin Texas. He replaced four capacitors, cleaned the board and bench tested the unit for $240. That was in October of 2008 and it's been working fine ever since.
    --
    '84 245 GL, '92 745 Turbo (stateside car)








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    Speedometer issue 700 1991

    Your model can suffer from wiring failures at the speed sensor on the rear axle, poor connections at the rear of the instrument cluster, or failing capacitors inside the speedometer head. See the FAQ for complete details.

    https://www.brickboard.com/FAQ/700-900/ElectricalInstruments.htm#Speedometer_Failures

    https://www.brickboard.com/FAQ/700-900/ElectricalInstrumentsPanelRepair.htm

    https://www.brickboard.com/FAQ/700-900/ElectricalSpeedometerRepair.htm







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