Isuzu Trooper Speedometer overeading





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  1. #1
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    Oct 2010
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    Default Isuzu Trooper Speedometer overeading

    have a 1994 Isuzu Trooper 3.2 V6. The speedometer has just started overeading, as the vehicle starts moving, the speedo just up, approx at double the speed, ie reads 120kph at true 60kph, any advice will be appreciated.

  2. #2
    Join Date
    Mar 2008
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    De Wildt
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    Default Re: Isuzu Trooper Speedometer overeading

    I'm assuming an old school type cable operated speedo? Or is it electrical?
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  3. #3
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    Default Re: Isuzu Trooper Speedometer overeading

    Electrical, sender on gearbox.

  4. #4
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    Default Re: Isuzu Trooper Speedometer overeading

    Quote Originally Posted by Old Technology View Post
    Electrical, sender on gearbox.
    Clean out the gearbox plug and socket with solvent and test. My JMC (Jiangling - Isuzu Motor Corporation) used to read between 120 and 180. Cleaning out the plug sorted it out.
    2001 Isuzu Frontier 4X4 DT280 LX 2.8 Turbo Diesel (Tourer)
    2011 JMC 4X4 Double Cab 2.8 Turbo Diesel (Work Bakkie)
    1973 Land Rover Series 2A 109" Ford V6 Kanniedood, Salisbury diff, galvanised chassis etc. (Hobby and Work vehicle)

  5. #5
    Join Date
    Mar 2008
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    Default Re: Isuzu Trooper Speedometer overeading

    Also check your alternator charge voltage: a blown voltage regulator causes voltage spikes up to 19v and this will cause havoc.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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