Question about 1991 Isuzu Trooper

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91 isuzu trooper

Hello, yesterday my trooper lost starting torque and the transmission light started blinking. It has an automatic transmission. I was still able to drive it home but it was very slow to take off from stopping. what do you think this might be?

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  • climbersean Sep 11, 2008

    Hello, yesterday my trooper lost starting torque and the transmission
    light started blinking. It has an automatic transmission. I was still
    able to drive it home but it was very slow to take off from stopping.
    what do you think this might be?

  • vacantindust Dec 12, 2008

    I have the same problem with mine. If I turn the vehicle off and start right back up it is fine, but nobody can tell me what the exact cause is.


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I had this problem once after I had taken the trooper to a car wash and washed under the hood. Got the blinking light and low power on take off. I took off the bracket that holds the trans relay along with a few other relays located on the right wheel well under the hood. Took the relay wire conections apart and cleaned them and it worked like a charm again. Even better than before. You may just check the leads to the relay to ensure that they are not corroded or gummed up. Also it may just be your relay malfunctioning. In any case your trans relay is the one that is visible without taking of the mounting bracket. Good luck

Posted on Feb 12, 2009

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There was a problem on the late 80s - early 90s Trooper transmissions that whenever the system electrical voltage in the car drops below 14.0v the transmission goes into what has dubbed "limp mode" which is what you all are familiar with. (yes, I'm familiar with it too, it's my indicator of when I need to stick my battery on my charger)
Go buy a battery charger and charge your battery for a few hours at the appropriate setting when this occurs, you'll find that the problem will go away for a while (or until you use ALOT of electricity again)
You'll also find that it worsens during the winter and at night (when your headlamps and/or heater are on)

I hope this enlightens the situation for you all. Took me 4 years to find this answer.

Posted on Jan 30, 2009

  • esmartuek Jan 30, 2009

    Also like to comment that if you're clever and skilled that you can move the gear into neutral while the vehicle is still moving and toggle the ignition from ON to ACC and back to ON again. If you do this quickly enough, the engine will not stop turning but it will reset the electronics on the transmission to accept the current voltage level.

    While I wish there was a fix for this issue, the only one I can think of is to either figure out an overvoltage system for your battery(s) (i.e. installing a backup battery and a circuit to regulate the voltage at over 14.0V) or to install a higher amperage rated alternator, as 105amps seems to be ineffective for our vehicles.


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Posted on Mar 06, 2009

  • rch701 Mar 06, 2009

    my 93 trooper had a similiar issue. i was driving down the highway and it suddenly down shifted and went all to hell. it turns out my powersteering leak fried my alternator causeing a voltage drop which as i have read screws up a tranny too. as soon as the alternator was fixed all of it worked just fine


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With the troopers there is a link between the transmission light and automatic shifting. while im not sure of the cause of the problem, i do know that when the transmission light starts blinking you will have to shift manually. L - 1st 2 - 2nd 3 - 3rd and D - 4th. Ive been going through this recently and still have to get the transmission checked out but it helped when i checked my at fluid and filled it. im also planning on replacing the transmission filter. good luck.

Posted on Nov 11, 2008

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Well, I'm not totally sure about this one. I think the dash light is connected to a pressure switch, and when fluid pressure falls below a certain point the light comes on. This could be due to lots of reasons, low fluid? Are there any leaks? Do you find spots of red/pink fluid under the truck? You don't say if you checked the fluid level. If it's low, add the correct type, don't overfill the tranny, this will cause other issues, and see if this cures the problem. I'm guessing that it's more than just low fluid though. Torque converter failed, or a vacuum valve body went bad. You may have to take this one to a tranny shop and have them diagnose the problem. Personally, I'd avoid Aamco and Cottman, every issue with them is a complete rebuild, and in some cases this may be true, but it can be done by a small independant shop, and usually at a better price. My opinion only.

Posted on Oct 06, 2008

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