Question about 1989 Isuzu Trooper

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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

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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.

Posted on Dec 30, 2010

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1998 Isuzu trooper 3.5 alternator replace


step one remove battery neg lug .
the above video (of book?) is wrong.
the belt tension-ing step was skipped.

remove belt steps remove alt. wiring. remove alternator (bolts) it falls free. replace it , reverse steps above belt back tension belt. battery cable back. test run. charge/BAT lamp off?
see wrench below, turn it CW.
this releases the spring tension and belt comes off
to put back, do same and put on belt and release wrench.

25186758-dk3xh54xw1fmpqbxyhqoyzal-4-0.jpg3.5L only. USA only.

Oct 05, 2014 | Isuzu Trooper Cars & Trucks

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

What is the correct preasure of fuel pump for isuzu trooper II 1989 V6 american version


The engine is a GM 2.8L V-6 with TBI. Typical fuel pressure would be around 28 PSI.

Oct 07, 2010 | 1989 Isuzu Trooper

1 Answer

I have an 1989 isuzu trooper it stall as i am driving it do not matter if i am driving in the middle of the street or at a stop it will stop, at first it would start right back up and now it will not star,...


Check for spark at the spark-plugs the next time it dies on you--you will need an assistance with you.
If you have no spark than you may have a bad magnetic pick-up in the disributor--I am assuming that it has a disributor.
Or if that 's good than check for fuel pressure--may have a bad fuel pump or relay.

Nov 01, 2009 | 1989 Isuzu Trooper

1 Answer

1989 Isuzu troop temp gauge goes straight to hot when key turned


there is a sending unit for the guage.but if it has been running a few minutes and gets hot you may need to check the thermostat or water pump.check the water pump by taking the radiator cap off.then start the vehicle,look into the radiator and see if any coolant is flowing or circulating.do the cheapest fix first

Mar 15, 2009 | 1989 Isuzu Trooper

1 Answer

Fuel, brake, and alternator warning lights stay on.


change the charge light relay (the blue one) located offside front wing fuse box, get off ebay or from millners.co.uk

Mar 07, 2009 | 1987 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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