1. #1
    michaelc291's Avatar
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    Speedo has gone erratic

    On my 1994 XJ RHD my speedo has sometimes started jumping up to 80kmh irrespective of what speed I am doing. (It came with KM/H rather than MPH). Sometimes it is fine.
    If I continue to drive with it stuck at 80 it may suddenly start to give the right reading. The needle is steady and does not flap about like the old cable driven ones did sometimes.

    To be honest I am not sure if it is mechanical or electronic, though my bet is electronic.

    Has anyone had this problem and what can be done to sort it?

    If I have to find a second hand head, how can I clock it to match the car's original mileage? The mileometer (odometer) is mechanical.

    I'm looking forwards to your suggestions. Thanks all. Mike.
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  2. #2
    JPNinPA's Avatar
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    Re: Speedo has gone erratic

    Have you ever replaced the speedo gear? If the gear is not seated or clocked right in the housing you could end up with chipped or mushed teeth.


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    JPNinPA

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  3. #3
    mark sr's Avatar
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    Re: Speedo has gone erratic

    I don't know for sure but I'd be inclined to think your speedo is cable driven. You have to disassemble the speedo to reset the odometer. I've done it before but it's been a long time ..... and technically it's illegal.

  4. #4
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    Re: Speedo has gone erratic

    Thank you for the suggestions. I looked at gears on the net and there seem to be dozens to choose from. Why are there so many?
    I think I'll get underneath and see if it has a cable or a sender attached. I agree about clocking the clock but is just from my convenience and to keep it right on the test cert. (just don't tell anyone).

  5. #5
    JPNinPA's Avatar
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    Speedo has gone erratic

    So many? : to cover/correct all gear tire size combinations that result in different speed and odometer readings.

    Oh and being you told only me on an open forum. Ill keep it just between us.

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    Last edited by JPNinPA; 03-11-2019 at 06:54 PM.
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  6. #6
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    Speedo has gone erratic

    Just another thought. Dash board connector behind the dash. It Often loosens causing various errors.


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    Last edited by JPNinPA; 03-11-2019 at 06:52 PM.
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  7. #7
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    Re: Speedo has gone erratic

    Thanks again for the suggestions. As the weekend is coming I'll get the screwdrivers out. If I need a replacement head has anyone got one they would part with (for a small fee)?

  8. #8
    JPNinPA's Avatar
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    Speedo has gone erratic

    Verify what engine you have. You might also post in the swap meet area with an appropriate title. Click bait


    Regards,
    JPNinPA

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    Last edited by JPNinPA; 03-15-2019 at 05:40 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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