Question about 1999 Isuzu Trooper

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4jx1 isuzu trooper wont start after overhaul and lost its injector electrical suply

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Posted on Jan 02, 2017

simontricket
  • 235 Answers

SOURCE: My Isuzu Trooper 2004 4JX1 turbo just underwent a

The ECU will be fine with a engine rebuild but the 4JX takes a bit longer to start if all the injector oil paths are empty - can be up to 5 or 6 mins of 20 second cranking bursts.
Also if you rebuilt due to diesel in the oil from bad injectors the control valve for the injector oil pressure may be faulty so it wont start.

Posted on Apr 20, 2009

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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

My isuzu wizard 1999 model diesel mixes with oil, I was thinking to change Nozzles the engine is 4jx1


If oil mixes in the combustion chamber, then you're up for an engine overhaul. Nozzle changes won't do.

Nov 04, 2010 | 1999 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

1 Answer

02 isuzu trooper


Need a bit more information to go on as there is no injector pump on a 4JX1 its a rail type engine .
You can get flash codes to come up on the engine check light from the OBDII socket by connecting pin 4 to pin 6 and turning the key to ign on . the light will flash - count the flashes gonna be something like 4 then 3 and maybe some other depends on how many faults you got.

If you get none then try my tips .

Dec 22, 2009 | 2002 Isuzu Trooper

2 Answers

My Isuzu Trooper 2004 4JX1 turbo just underwent a general engine overhaul. Its cranking but will not start. All electricals are ok. Does the PCM needed to be reset for it to start?


The ECU will be fine with a engine rebuild but the 4JX takes a bit longer to start if all the injector oil paths are empty - can be up to 5 or 6 mins of 20 second cranking bursts.
Also if you rebuilt due to diesel in the oil from bad injectors the control valve for the injector oil pressure may be faulty so it wont start.

Apr 08, 2009 | 2001 Isuzu Trooper

1 Answer

1999 trooper 4JX1 fuel black


engine oil leaking past injector O rings and going into fuel return hose back to tank contaminates tank. if recall done are O rings ok? can put clear plastic tube on return fitting in rear of head to see if black (contaminated with oil) or air leaks, from cold start, it isnt high pressure
it could be from before or now?

Oct 30, 2008 | 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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