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4jx1 trooper wont start after overhoul and no electrical suply on its injector

I think its a electrical problem becouse even we crank the engine still there is no electrical supply on its injector sensor..

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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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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jmgldsmth
  • 1889 Answers

SOURCE: 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

Posted on Aug 02, 2009

Suzman
  • 642 Answers

SOURCE: Isuzu Big Horn (Trooper) 4JX1 engine.... Vehicle

Sends a signal related to the rail pressure as a voltage to the ECM. 3 wire connector :

  • Red : 5V (Feeds from ECM connector J1-4) Shared with MAP sensor, EGR pressure sensor and accellerator position sensor.(compare values from these sensors and ECM connector)
  • Black : Ground (Feeds from ECM J2-22) Shared with the same sensors mentioned above
  • White : Signal feeds to ECM connector J2-22
Low pressure will set P1194 error code. Oil rail pressure should be more than 3MPa when cranking

Also check Engine coolant temp sensor and wiring. Engine coolant to manifold temp should not differ by more than 5 deg C either way after 8 hours of no operation. I have found the same symptom on these diesels with fuel supply problems. Operate the priming pump (on top of the fuel filter) until it becomes diffycult to push down before starting or checking anything else.

Posted on Oct 16, 2010

Testimonial: "Thanks Suzman, We actually managed to get it going....The only problem remaining is a rough idle until its warmed up and sometimes stalls until warm. "

stevenhurc
  • 450 Answers

SOURCE: 4jx1 camshaft marks on isuzu trooper 2001 3,0 dohc

the timming gear that the belt runs on has a mark (V cut in gear) to rear cover at about 12 o clock and crank pulley has timming mark for top dead centre, both cams have cut outs in rear that a special tool (camshaft stopper 5-8840-2592-0) locks into to hold cams in correct position, but can do without this, if the cam belt gear is off, the keyway should be at 12 o clock. the marks in the camshaft gears (dots) is for assembly of sissor gears to solid gears on camshafts that run together and they should match up only if you had this appart.

stevenhurc_12.jpg no.1 is timming mark

stevenhurc_13.jpgthis is the locking plate tool

Posted on Apr 24, 2011

  • 1 Answer

SOURCE: 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.

Posted on Aug 14, 2011

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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

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Hi I have a 2002 Holden jackaroo 3 ltd and it will not start it just winds over wat could it be


Holden Jackaroo 2001 3.0 TDI 4JX1 Problems - YouTube

? 8:14
https://www.youtube.com/watch?v=xLySKue4HzM
Feb 22, 2013 - Uploaded by sandgroper111
Holden Jackaroo 2001 3.0 TDI 4JX1 Problems .... Hi there, currently own a 3.0 2002 lwb trooper 34K miles ...Missing: ltd

4jx1 cranks over but will not start - Jackaroo Technical ...

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What is crank position sensor on Isuzu trooper 2002 3tdi


What is? It tells the ECU what position the crank is in to control timing.

Feb 13, 2015 | 2002 Isuzu Trooper

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What is the fuel pressure from the main pump to the engine.trying to be certain that my fuel have the require pressure for starting


Is the 30 ltr engine diesel? If so what was the reason and changed the Injectors? Did you follow the correct procedure to renew the injectors? This engine has two oil pumps. One is for the engine and the second one is the high pressure for the injection cranking system. On starting the engine and trying to start are you sure you receive the correct oil pressure to cause the injectors to open? If everything is okey,go to crank or cam sensor or even to the accelerator pedal.Also is better to clean the throttle body from any dirt. Use a scanner to give you the fault .Also bear in mind that these vehicles are fitted with the following secret,if you have a blown brake lights fuse or brake lights bulbs will not start,just engine turn and no engine run. It is the immobilizer activation. Do not over 32 times crank start otherwise you will loose ecu.

Sep 16, 2012 | 2000 Isuzu Trooper

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Our engine is running rough we have a 1999 Isuzu wizard 4jx1 - we think we have an injector problem - how can I check this fault - I need to establish if it needs a replacement injector or is it an...


Buy a can of throttle body cleaner take off the air filter box, follow the tube and then spray the throttle body and wipe it out first before condemning the injectors

Dec 01, 2010 | 1999 Isuzu Trooper

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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

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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