Question about 1989 Isuzu Trooper

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No overdrive 1998 Isuzu Trooper wont shift into overdrive

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  • Anonymous Mar 14, 2009

    I have the same problem with my 89 Trooper I read somewhere that the overdrive will not engage unless the computer reads a certian temperature level fom the coolant temp. sensor......but I have replaced BOTH of the temp. sensors...(under the intake manifold) There are also sensors in the tranny that the mechanics are looking at now. I'll repost when the problem is solved.

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Usually elecrical, switch, wire, connection, or mechanical adjustor on shifter linkage. I had the retainoing bolt break on me for no reason.... No biggie just a pain in the Donkey :-)

Posted on Feb 16, 2009

  • CJ Sep 23, 2011

    clean the throttle body, on removal, there is a intake and discharge line for coolant, if corroded or plugged, then the throttle body wont warm to run the RPMS correctly, usualy takes 5 minutes to warm up to get the gears to work right, will run in 3rd till its warm, even up to 80-100km/hr.

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I have a 1989 Isuzu trooper and it had the same problem. Change your thermostat. It is a $10 fix. The overdrive wont engage until a sensor heats up. When the thermostat goes, the sensor does not get warm enough.

Posted on Mar 23, 2009

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