My Isuzu Bighorn 4JX1 RJM Engine stalled after fitting it with new oil pump. It can crank but is emits smoke but not run. What could be the problem? I have tried to check if the fuel pump is not working but the test showed that it is working well.

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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

Get some BLUE DEVIL and follow the Directions. You have a Blown head Gasket or a Cracked Intake or Head.

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

try slightly over filling oil level if engine starts and runs for a minute or two then dies the oil pick up in sump has fallen out (cracked mounting bracket) or sucking air instead of oil. you can remove small tin engine sump after draining to check oil pick ups, after confirming it runs ok for a little while once over filling oil level in engine.
another thing that goes is the rail oil pressure sensor which reads incorrectly and a tell tale sign this is broken is the injector loom connector is full of engine oil when disconnected this is near engine oil level dip stick(wiring loom comming out of rocker cover), the sensors reading can be checked with scan tool before starting with ignition on, (0-0.2MPA) it must read if its reading higher with ignition on only (motor not running) the sensor needs replacing, the engine ECU needs to see approx 200MPA when cranking to get injectors to start to work properly and higher when running at idle and beond (up to about 5MPA at higher revs) if this is not getting to this or readings are fluctuating badly indicating air in oil the injectors wont supply the correct amount of diesel. in which the engine oil comming from low pressure (pickup pump) to then high pressure oil pump to rail and injectors.

MAKE SURE THAT WHITE EXHAUST ISNT ANTI FREEZE. CK the spark plugs for fuel and/ or coolant. After cranking for hours damage can occur.

White smoke is usually a sign of coolant burning. Carefully open the coolant cap, sniff the inside. If there is an exhaust smell you more than likely have head gasket problems. A further diagnosis is needed to be sure. Also ensure that any wires/plugs are reconnected. If the oil sensor is unplugged the vehicle wont start.

if you use the wrong oil viscosity will have trouble starting isuzu
oil switch in them has to have pressure up before she will open solenoid let fuel in
make sure proper oil was fitted

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 .

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.