Question about 1991 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?
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
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 automotiveforums.com 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
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
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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Posted on Jan 02, 2017
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Mar 29, 2014 | 1994 Isuzu Trooper
engine and the automatic transmission in this vehicle are computer
controlled and in most cases when a fault occurs a fault code is
stored in the memory of the computer control module. There are
exception to this, such as the Mass Airflow Meter and fuel pressure
problems. What must be done is to have all the basic testing done
such as a scan of the system for fault codes as well as a check with
a live data scanner tool for engine functions that are not within
range of normal, a trained technician is required to know what is
correct and what isn't, then based on careful diagnostics done from
a factory repair manual the correct part is replaced or the wiring
repaired or the computer replaced (known as the PCM), which is very
rarely the problem. Other basic checks must be done as well such as
mechanical problems with the engine as well as engine state of tune
and mileage on the engine. The transmission can have mechanical
issues as well such as no gear engagement at all or a failed pump or
other pressure related problems.
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