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Isuzu Trooper Maintenance and Repair



  • boxtrooperboxtrooper Posts: 843
    Dome lights on because of a bad door switch or not quite closed door? Or if the dome lights are specifically turned off, the lights in the bottom of the door panels? An aftermarket stereo is standby mode instead of off? Faulty ignition switch leaving power on in general?
  • We have 63,000 miles on a 2001 Trooper LS (4cylinder) & have never had any problems until now. When you step on the gas the car won't go more than 20 to 30 mph. My son was doing driver trainer on the interstate going 70 then suddenly it drops down to 15 to 20 mph and won't go any faster. It's been doing this for a week. We took it into an auto repair and they said they called a "hotline" and said it was a wiring problem. They replaced a wire. It worked o.k. for about 48 hours and now has the same problem. We've taken it back in and they're saying "gee maybe its a computer problem, we're not sure". They've kept it for 2 days now. We live in the middle of nowhere in the midwest so there's no dealership to take it to. Has anyone heard of this problem before? I'd appreciate any input!
  • boxtrooperboxtrooper Posts: 843
    Do you have the 4 cylinder diesel? If you do, how did you get it into the USA? And what's your MPG?
    Or the 6 cylinder gasoline engine? I have not heard of a 4 cylinder gasoline 2001 Trooper.
  • spiveyspivey Posts: 1
    Hi - Long story short - Wife took the vehicle on 3 hour trip with tran fluid 2 quarts low. Transmission will only shift manually now. 1st through 3rd gears work manually with no fourth gear shift up when I go to D; just stays in 3rd. I can shift down from 3rd to 2nd to 1st with no problems. Placing the shifter in D starts the transmission in 3rd. It won't shift up or down out of 3rd. Somebody please tell me this is a simple problem to fix. This has been my 2nd Trooper - it now has 150K+ on it. Love this car :D .
  • Hi, It is possible for you to check for trouble codes on your vehicle. If you get a code and need help, post again.

    1995 Isuzu Truck Trooper (2 Door) V6-3165cc 3.2L DOHC (6VD1)
    Vehicle Level Transmission and Drivetrain Transmission Control Systems Testing and Inspection Testing and Inspection Procedures Displaying and Reading Trouble Codes

    Displaying and Reading Trouble Codes
    This is a link to a diagram of locating the jumpers. .gif/photo/v./photo.jpg

    DTC can be displayed by the Transmission Control Module (TCM) by shorting together terminals 1 and 2 of the TCM Diagnosis Connector (C-92) located left side of left instrument panel (This grounds the TCM pin D16).

    After this, the CHECK TRANS Indicator will be OFF for 3.2 second and then will flash each DTC 3 times.
    When there are more than 9 flashes this means that the indicator is constantly flashing, OFF for 0.4 seconds, ON for 0.4 seconds. In this case there is no DTC stored in memory. To find the problem without a scan tool and without DTC GOTO WITHOUT DTC CHECK.
    When there are less than 9 flashes you will see DTC of 2 digits repeated 3 times each and when all codes have been displayed they are displayed again beginning from the first one.
    Do not care about the DTC order : if "21" is before "22" it does not matter.
    Write down all codes numbers and GOTO DTC CHECK.
    IF CHECK TRANS indicator is not flashing GOTO "CHECK TRANS" CHECK.
  • I'm brand new here, so forgive me if I err hugely!
    I have a '93 Trooper who is my pride and joy. I have had her for 2 years, third owner. When I bought her I did some preventive maint. stuff (brakes, tires, timing belt, clutch,etc)--and she runs great. She's got 111k and my issue now is a fuel smell/leak in the engine compartment. Needless to say, she is parked. Other than the smell and obvious leak, she runs great (best in cold weather)no stalling nothing. We can't find the source of the leak. My questions: Is it about time for an overhaul? Should I consider an overhaul? Would an overhaul replace parts that might be causing the fuel leak? (I'm assuming it is something along the line of worn hoses and the like) Should I instead just concentrate on letting a mechanic find just the leak? I intend to keep this Trooper until the wheels fall off so an overhaul is just a matter of time. Please forgive my total inexperience with vehicles, this is my second car--and I'm quite attached to her.
  • Hi, the gas smell could be from a variety of sources, but an overhaul might be overkill. The fuel system is pressurized by a pump in the fuel tank, and the pump only turns on for about 2 seconds when you first turn the key on. Then it will turn on when it sees oil pressure from the engine running or from cranking long enough to do same. That means that when your trooper is not running and just sitting, there may not be enough fuel pressure to spot a drip or pool of fuel, and if the engine is running the fuel may vaporize too fast to see due to the heat. The bottom line is the fuel system should be inspected from tank to fuel injector, and care must be taken to insure no injury to you or the vehicle. If you can't spot or isolate the location yourself, then a mechanic would be your best choice. Your trooper does not need an overhaul just to fix a leak. If you search this forum you will find many Troopers with far more miles than yours and no overhaul. The complexity of the fuel system with its' O-rings and connections may just be more than the casual car owner can handle. I hope this info helps you decide what to do. One owners opinion!
  • I found my 2000 trooper's Check Trans light on. At low speed, when I speed up slowly, I can feel the shake of the car. Anybody now the reason? Please help.

  • My '99 Trooper has been performing like a charm for all of her 136,000 miles. But on Labor Day, I had driven only about 100 yards out of my driveway when she bucked twice and stopped dead: the electrical system was instantaneously and completely flat. The rapair shop towed the Trooper and installed a new battery, and I went on my way. Then two weekends ago, she started bucking again on the Interstate and then lost almost all power. Towed again. This time the air mass sensor was replaced and away I went. For the past few days, the Trooper has been surging not only when the engine is under load but sometimes at normal speed on a flat roadway. The repair guys see no problem codes on the computer. I don't want to spend a lot of money unnecessarily, but I'd like to continue my long and happy relationship with this fine vehicle. Any ideas?

  • Sent it to Dealer and told me low speed transmission sensor is bad. Changed it. $550 :cry:
  • Our '96 Automatic Trooper needed a transmission replacement (lost reverse completely) and since then the replacement transmission has been nothing but problems, it runs fine for a while after the shop "fixes" it, then it acts up. Currently it seems like it's not downshifting back to 1st gear after reaching a certain speed or distance or both. When you come to a stop, then start up again, it feels like the truck is in 3rd gear...the mechanic can't figure it out...anybody??
  • Hi, is there any chance that you have the winter switch in winter mode.....that option commands the trans to start in 3rd to increase traction when driving in slippery conditions?
    I have to wonder though, that if your original trans was OK except for reverse, then the new trans does not sound like it was built properly if you have had problems with it since installation.
    You might inquire if the mechanic used a scan tool to check for trouble codes that might be set in the transmission controller. Good luck
  • I spoke to a man the other day that had the same problem (battery drain) check the positive cable all the way ....his insulator had melted close to the head light causing a short to ground thus draining the battery upon sitting......good luck
  • My Brake ,Fuel and battery lights came on at the same time now wont go off and heater/ac fan wont work and it runs very rough please help.
  • sbcookesbcooke Posts: 2,297
    Don't forget about the standard intake manifold gasket problem, compression like issues could be attributed to this. Mine went at 40K miles, and I had to take it into the shop over and over and over and over again, because it didn't show codes and they couldn't recreate it from the parking spot to the garage bay. I finally had the service rep use it as a personal vehicle for a day and tell me what he failed the first time he took it out and was fixed the next day.
  • It is a possibility that your alternator has gone bad. I had the same experience with my 94 trooper, and that is what was wrong. The dashboard lit up and the heater would not work. If it is your alternator, your battery is not being charged, which leads eventually to the engine quitting.
    Good luck
  • I replaced the alternator it didn't help the dash lights are still on. :confuse:
  • atfdmikeatfdmike Posts: 414
    Not to sound too defensive, but my previous post suggested a possible cause, not the sure reason. Did you have the original alternator checked before you replaced it? did your ac/heater fan start after you replaced the alternator? What engine do you have? Anyway, I did a search for possible technical service bulletins, and they follow. A big problem on Isuzus in general has been the electrical connectors. Apparently a lot of glitches can be caused by them. Checking your wiring harness and connectors might be a good start too.
    You can check for codes too, if you find any, post and an answer may be had, by:
    Connect white (test lead) and black (ground lead) wires that are branched from the fuel system control harness approximately 8 inches from ECM. (These leads can usually be found near the cigarette lighter and will be wrapped in green tape if they have never been disturbed). After the leads are connected, turn the ignition switch "On". The ``Check Engine'' lamp will flash appropriate trouble codes. The codes are indicated by pulsing of the lamp. Two pulses followed by a short time lapse, then three pulses would indicate a code 23 and so on. If only one trouble code is stored, the code will repeat continuously until test leads are disconnected. If more than one trouble code is stored, each code will repeat three times, starting with the lowest, then proceed to the next code. After all codes have been shown, the pattern will repeat itself. Refer to Fig. 4 for trouble code identification.
    Trouble codes can be cleared by removing voltage to the ECM for 10 seconds. After a fault has been corrected, remove the ECM fuse or disconnect battery cables for 10 seconds.

    Remember, these are just suggestions, you have to start somewhere, but sometimes they help.

    1985 Isuzu Truck Trooper II L4-1949cc (G200z)
    Vehicle Level Technical Service Bulletins All Technical Service Bulletins Alternator Wire - Damage/Shorting
    Alternator Wire - Damage/Shorting

    SB87-04-003 July 17, 1987 ELECTRICAL


    P'UP (KB) and Trooper II (KT) models with 4ZD1 engine.


    Several wires at the rear of the alternator are routed through a metal hold-down clamp. This clamp may damage the wires' insulation, eventually shorting or grounding the wires. Various electrical problems
    ranging from a blown fuse to failure to start may result from this damage.


    If the wires at the rear of the alternator are damaged, repair or replace the harness as required. Even if no damage is visible, wrap the affected area with tape or other protective material to prevent future damage.

    1985 Isuzu Truck Trooper II L4-1949cc (G200z)
    Vehicle Level Technical Service Bulletins All Technical Service Bulletins Engine - Backfires Excessively

    Engine - Backfires Excessively

    SB87-03-004 September 15, 1987 EMISSIONS

    1982-1987 P'UP (KB) and Trooper II (KT) models with gasoline engines.

    SERVICE INFORMATION - /photo/v./photo.jpg

    Excessive backfiring may be caused by a clogged gas vapor filter. Filter is located between the intake manifold and the mixture control valve.

    Replace the gas vapor filter as outlined in the appropriate Workshop Manual.


    Part No. Description

    8-94236-909-0 Gas Filter
  • Hi, I just inherited this car from my daughter because of the following problem. You can be driving along when all of a sudden the dash lights go out and the speedometer goes to zero. This usually happens when you're slowing for a stop and than the motor dies. By popping the clutch it will restart and stay running with the check engine lite staying on. As I understand also, the O2 lite has been on for quite some time. The mechanic said the problem might be a speed control sensor. Is this something the average weekend mechanic should tackle? Thanks for any help
  • atfdmikeatfdmike Posts: 414
    You should get the trouble code that can be read by most part stores, or do it yourself by searching the Trooper forum for "pull trouble codes" or similar search. Once you have the code number, it will give you a better start point unless someone has had exactly the same experience, which does happen once in a while.
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