Question about 1999 Isuzu Trooper

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Dear sir MY bighorn 4JX1 have problem it sudenly cut of the engine and it start again, but it is comming offen. At beginng it looks fuel shortage, but isn´t, then i notice that before it cut off it make noise as someting hiraulic is shuting down. There is no computer check here where I live, but can I check some sensor? which ones and where they stay?

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  • cassamoaboob Feb 12, 2010

    Unfortunatly isn´t that sensor

  • cassamoaboob Feb 17, 2010

    The problem is not at rail oil pressure, i found after computer scan

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  • 235 Answers

Rail oil pressure sensor is the one to check first ,buy the engine oil dipstick is a electrical connector with all pink wires going into the engine but on the other side will be one white one maybe looks a bit yellow , now pull this one wire out and see if you can start the car ?

If starts good the sensor is faulty but dont drive like this its only a test ,get a new sensor.

Posted on Feb 08, 2010

  • Simon
    Simon Feb 15, 2010

    If its 'pop' noise its just the EGR flap coming open thats normal for this car .

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1 Answer

How to fix an injector pump of 4jx1 engine


this is a USA forum what country are you in?
Fuel systems vary by engine, and country, so......?????
what needs fix'n?

the word fix has many meanings
  • how to rebuild the pump?
  • time it?
  • how to remove it put back?
  • how to bleed it.
  • and on and on... or a lift pump or ?
try to say what you are doing "the job" and why,
or if not a job, must be diagnosing it, ?
say , im trying to test it or. what ever you doing.
we cant guess, what fix means.
Diagnosing direct injection?



The 4JX1 is a 3.0 L direct injection diesel engine, turbo, some intercooled, which replaced the 4JG2 in the Isuzu Bighorn/Trooper/Holden Jackaroo.
It uses unit injectors and 4 valves per cylinder.

European and Asian buyers could opt for the diesel.

see we dont have this.
troopers are sold in Asia too, but not here with diesel.

Jun 28, 2016 | 2002 Isuzu Trooper

1 Answer

We live in New Zealand and own a 1998 Isuzu Bighorn, 3.0D. About 3 months ago it started idling roughly and stalling just after starting. Then it stalled on me when I was driving 70kph. It also has no


wow first post ever posting country ,what a brave person. !!!!
welcome to USA forums ,that have no such car.(truck)
the line up. (wiki list) so its 3.0L 4JX1
stalls and lost power.
The 4JX1 is a 3.0L direct injection diesel engine, turbo, some intercooled, which replaced the 4JG2 in the Isuzu Bighorn/Trooper/Holden Jackaroo. It uses unit injectors and 4 valves per cylinder.

can be caused by many reasons. get it scanned yet. ?
or see FSM book on flash codes from the direct injection fuel
controller? (per this engine option and market)

does turbo have proper boost? (PSI boost or +1 bar boost?)
does it even have a boost gauge.?
there are over 50 causes, of stalls (most inside engine)
but its not getting boost or the injection rates are wrong.
there are basic tests for each covered in the FSM
Factory (oem) service manual, with coverage for this engine.


3.2 L 6VD1 SOHC V6
3.2 L 6VD1 DOHC V6
3.5 L 6VE1 DOHC V6
3.0 L 4JX1 TD I4
3.1 L 4JG2 TD I4

Feb 15, 2015 | Isuzu Cars & Trucks

1 Answer

Where can i find Isuzu 4jx1 injectors in Zimbabwe or South Africa.


If you like I can send you one. I need the make, model and year of the vehicle as well as the VIN number.

Mar 23, 2014 | Cars & Trucks

1 Answer

I cannot start my isuzu bighorn w/4jx1 engine. we already changed the turbo but still it emits too much smoke in the exhaust and after a while the engine goes wild and we cannot turn it off in the ign


Its a diesel and its running away so do not try to start till you do the following and yes i know i will be amolished for being a cowboy by the other experts but what you do is to make a gasket for the EGR valve from a coca cola can and seal it off if you dont it may run away and blow itself to pieces .If you do this then it run as normal as the older trucks never had these thing fitted and they all run ok in my day ,exactly whats wron i couldnt tell you without my head under the bonnet but do as i say and it run perfectly

Mar 22, 2012 | 1998 Isuzu Trooper

2 Answers

Isuzu tropper 4jx1


You have no injection pump ,each injector does that job .
You have a faulty rail oil pressure sensor I think ,read my tips to test this sensor .

Feb 06, 2010 | 1998 Isuzu Trooper

5 Answers

Engine start normally and when it reach the maximum heat of the engine temperature it starts surging and engine cuts out when u try it to start again it won't start.what are the possible cause of the...


Dear sir I have Bighorn 3.0 4JX1 car. Suddenly it start cuting of engine while running, like no fuel, but it start again. But sometimes it doesn´t. and before cutting it make noise us the fuel supply is cuting in the pump. Here we don´t have computer scan. Can someone indicates where to check? which sensor? Thanks

Jan 20, 2010 | 1999 Isuzu Trooper

2 Answers

I cant find the location of diagnostic socket of Isuzu 4jx1


The ODB socket is just under the plastic trim that goes over the gearlever cover by your right foot , no tools needed to get it out .
The 4JX1 is a HUEI type engine so the diesel is not under high pressure until injected .
To prove if the fuel is starved put fuel in a can and pipe it into the hand primer pump direct .
Most likely cause is the Rail Oil Presure Sensor as this controls the amount of fuel injected via the ECU .

Jun 18, 2009 | 1999 Isuzu Trooper

4 Answers

Isuzu 4JX1 EngineWont Start after replacing new injector


my isuzu bighorn will not start after changing valve seals and head gasket and after setting timing it still will not start. do you have a solution.

Aug 09, 2008 | 1999 Isuzu Trooper

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