Question about 1989 Isuzu Trooper

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1989 Isuzu Trooper Won't Start

My wife & I have replaced the fuel pump, fuel filter, All four fuel injectors, engine relay, and properly rerouted the vacuum lines. There is fuel pressure to the fuel rail. There is excellent spark. She still won't start, What else can we try?

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  • Larry Feb 18, 2009

    You are brilliant, Thank you very much, I'm on it.

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Oil level!!!

Posted on Feb 16, 2009

  • miracore Feb 16, 2009

    Finally got on.. Yes, I wrote a long answer and ws unable to "copy" it so it is lost... Ok, the oil level is easially missread so triple wipe and check for clean line. If the level is too low or the sensor is broke it won't allow the fuel pump to turn on... It is a great safty mechanism but a real pain if you've gon through the pain in the Donkey to remove the gasse tank and replace fuel pump. always, find connector on right rear wheel well (square plug) two wires, red and black... Hot wire it and see if it works. BEFORE REPLACING pain in the Donkey fuel pump.

    Also check all vacume hoses, especially the three block right under the intake manifold and the large one under the intake manifold.. you can't see it without a mirror. Another pain in the Donkey!! Still doesn't work? I onoly think it might be the timing belt has jumped or broken.. another pain in the Donkey!! Replace everything while your in there!! and the ac can be moved out of the way without discharging. Compressor and air wrench (rachet type ) is essential for working on this car, along with lots of extention, extentions and odd sized box end wrenches!!! I love this car but it is a pain to work on... What were they thinking?? Like I've thought it would be so simple to have an access pannel for the fuel pump!!!!! I could go on. Also I have heard that there are two temp sending units and one is used by the computer, if it goes bad is screws things up badly and you'll flood the car out when it is hot and thinks it is cold. All the best.. Colin

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Have you done a compression test or checked the timing?

Posted on Feb 19, 2009

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1 Answer

My 1989 isuzu trooper will not start it is not battery or alternator i replaced the fuel pump and it started 3 times then after sitting for a few minutes it wouldnt start anymore any ideas?


i had similar problems with my 1989 as well as the wife's 1990....my problem was freyed wires near gas tank as well as fuel pump relay...the wife's was relay as well.try to follow fuel pump and relay wires test along the way. hope this helps!!

Dec 30, 2010 | 1989 Isuzu Trooper

1 Answer

My 1989 isuzu trooper will not start it is not the alternator or battery and i just replaced the fuel pump what could be wrong


Slacken injector pipes and check your getting fuel.The fuel tank is a fault with the trooper, The feed pipes are at the top of the fuel tank, and corrode causing the main feed pipe to draw in air.You have to remove bottom pan under tank and then the three bolts each side of the tank to drop down,taking care not to pull on the outher pipes.im quite sure that's your problem.Any ait that can get sucked into the fuel line.That engine will not start.

Dec 30, 2010 | 1989 Isuzu Trooper

2 Answers

1991 Isuzu Trooper. Recently my truck simply wouldn't start with no previous indications of trouble. The engine turns over but there doesn't appear to be fuel making it to the engine since after pumping...


Disconnect the fuel line at the fuel filter. Turn the car on for the pump to be on. If you are getting gas pumped out, then your pump is good. If not there's most likely your problem. Then try the line at the engine. Disconnect and see if the gas is making it that far. Your should also be able to hear the pump come on if you open the gas cap and listen while someone turns the key to the on position.

Jun 04, 2010 | 1991 Isuzu Trooper

1 Answer

Isuzu trooper starts briefly then dies


check your fuel delivery from the pump to the "dry" pulsing injectors leave the crank sensor alone! open the intake and, spray either (engine start) into the engine then attempt to start; it should start and, run until the either is used up then die. most likely your fuel filters are clogged

Aug 02, 2009 | 1992 Isuzu Trooper

1 Answer

Not getting fuel through the system


Is the fuel pump operating? If the fuel pump is operating then change the fuel filter. If the fuel pump is not working, then check the relay. Hope this helped.

Jul 15, 2009 | 1989 Isuzu Trooper

1 Answer

1989 trooper just died


Have a 2.6 with the same issues. only mine will almost always start after disconnecting the fuel line and reconnecting it. I have replaced the fuel pump, inline filter and pressure regulator. My car dog friends are telling me it's the injectors.

Sep 03, 2008 | 1989 Isuzu Trooper

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