Question about 1993 Isuzu Trooper

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I have a 3.1 auto bighorn and the auto transmission from time to time plays up by jumping and seems to slip. Also the speedometer reading drops to zero and no mileage is recorded. I don't think its a mechanical problem and it appears to me anyway if some kind of transmission power management (electrical) is playing about. This is an intermittent fault and sometimes everything runs normal. Any ideas what to do. Would it be some kind of sensor playing about? If so where would it be located? Thank you Regards Mike

Posted by netwizbiz on

  • Artcval Aug 13, 2008

    I have the same problem and in my case, the ATOIL/Temp warning in the dashboard appears every now then. The engine loses power and transmission seems to slip. I have already changed ATF but after a day, the ATOIL warning lights again. Please help. thanks.

    ART V.

  • dbroberts53 Aug 24, 2008

    my 1993 bighorn has same problem.most of time its ok. after running for about half hour speedo stops and if i have to stop vehicle i lose last two gears (overdrive) after a while when driving speedo starts working and overdrive kicks in again. been like it since i bought car 2 and half years, never got any worse



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The speedo sensor is at the back of the transmission and it controls the overdrive or last two gears.this is an electrical switch and needs to be replaced.

Posted on May 03, 2011



Speedo sensor is at the back of the gearbox and it controls the overdrive or last two gears.this is an electoral switch and needs cleaning so that it makes contact again.

Posted on Aug 08, 2008


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