Question about 1990 Isuzu Trooper

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Check Engine light goes on and off

My Isuzu trooper is a V6 2.8L 1990 TBI Gas, Manual Transmission. The Check engine goes on after a few miniutes at idle speed. When the car is driven, the light turns off almost inmediately, The same thing happens when driving down a slope, when you don't have to use the gas pedal. Once you press the gas pedal, the light turns off. I read the computer codes and it indicates that the problem is with the oxygen sensor. I changed it for a new one, but the problem remains.


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  • mausiba Mar 11, 2009

    Thank you, I will follow your advice. I will tell you later.

  • mausiba Mar 16, 2009

    I could not find the vacuum leak, but I know there is one because the idle speed is high (somewhere between 1000 and 1300 rpm), and while being at idle, if I press the breake pedal for a few seconds, the speed increases even more upon releasing the break. A few seconds later the speed returns to the initial value.



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My experience with these isuzu check engine light is that your air gas intake is not being properly regulated what you need to to change out or clean really good your kanooder valve and duflauge sensor. after those two things are taken care of reset your engine light by resetting your engine light relay or fuse.

Posted on Apr 23, 2009

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Run a trouble code test to see what part is causing the check engine light to flash. I would lay my money on an O2 sensor.

Posted on Mar 10, 2009

  • yadayada
    yadayada Mar 10, 2009

    sorry did not read your entire post, check for intake manifold vacuum leaks with a can of carb spray (engine idle will change if u have one when the spray hits the leak), also check all vacuum hose's at engine, if u have a MAF sensor clean the inside with MAF cleaner, it is made by CRC. Get back to me if this doesn't clear the issue.



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