ISUZU TROOPER 3L injectors, what oil pressure do they require to make them work

Where is the oil pressure sending unit located? ('86 4LZD1)

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View topic - location of oilpressure switch

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Oct 4, 2009 - isuzu trooper owners club uk community forums for owners of the isuzu trooper, rodeo and bighorn ranges of japanese 4x4 vehicles, ...

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oil viscosity is very important, and yes if the rail oil pressure sensor is not reading correctly at least 3 to 5 Mpa while cranking the injectors will not be turned on by the engine ecu. if you can get a scan tool look at rail oil pressure sensor reading just after cranking it should drop to 0 to 0.5 Mpa if any different its no good, also check for oil leaking out of main injector harness connector near engine oil dip stick if oil leaking out of connector this pressure switch which is in oil rail under rocker cover is no good and injector harness needs replacing this is very common.

you need to set the timing to top dead centre and the flywheel has a little knotch in it set that at 6 oclock will start then

Yes you can . Requires some skills but the only bits that dont work after are the speedo and the rev counter .

These can be made to work but its a bit tricky ..

The 3.0 is getting on a bit now but they are good value still.
Injectors are still being covered under warranty by Isuzu by good dealers free of charge .
If you buy one you need a good  local garage service them properly  to the hand book specs .
We have 5 !  and my other half's did 206000 miles (1998 model) before the injectors gave trouble and Isuzu still fixed the engine free .

I pass on what I have learnt on here ,another good source to read about them is www.itocuk.co.uk 

If you have the belt driven injector pump its 2560psi on the first spring and 3903psi on the second spring.
If the pump is gear driven and single spring injectors its 2631psi

need a injector pump dial indicator to set up lift in pump (movement on dial indicator)0.05mm at correct timing mark on crank pulley 12 deg.
the above is an example for 4JB1 & 4JB1-TC
which are isuzu diesel engines

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.

Oil level!!!

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?