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I have a isuzu bighorn UBS73 4JX1 and it seams to be hard to start when cold,It just winds over alot,could it be oil pressure sensors and if so can i buy pass them so it starts easier.

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  • Isuzu Master
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No do not do that ,ask a local mechanic to check out the pre heat circuit

Posted on May 16, 2010

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Posted on Jan 02, 2017

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1992 isuzu bighorn 3.1 turbo diesel, rebuilt injection pump, will not cold start


1: compression good.
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3: test fuel, does test fuel work??????
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Head gasket not torqued down correctly is where I would start. A simple pressure check will show this up.

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It's venting compression into the cooling system. Anything from a bad head gasket to a cracked head or block. Start the engine cold and see if the pressure jumps up quick before the engine is even to running temperature. If so that's what it is.

May 01, 2012 | 1998 Isuzu Amigo

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I have a Isuzu Bighorn 4jx1 but is hard starting. When it crank the engine on but bit not pick up speed or it it starts like it was out of fuel. Can you advice on what to do? Hear from you the...


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.

Aug 29, 2011 | Isuzu Trooper Cars & Trucks

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Hello Steve, I've just had a 4JX1 engine rebuilt. Vehicle does not start and rpm not jerking at all on kick and start trials! Oil seems to be moving ok. Could we have damaged may be any sensors? Thanks for...


hi Steve. May be sensor camshaft/crankshaft I have problems not srart engine 4JX1 Isuzu Bighorn I replaced sensor camshaft pma200578@mail.ru max russia

Feb 07, 2011 | Isuzu Trooper Cars & Trucks

1 Answer

Isuzu Bighorn Blowing Blue Smoke and Has Trouble Starting. Since the last service on the Bighorn it has seemed sluggish i.e. lacking power. In addition it is blowing a lot of blue smoke and will often not...


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
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Feb 16, 2010 | Isuzu i-370 Cars & Trucks

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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

1 Answer

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...


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.

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1 Answer

1998 isuzu bighorn diesel starts and shuts off without any warning while driving.


If you got the 3.0 i'd say its the rail oil pressure sensor goin west .
If its the 3.1 check your shut off solenoid on the fuel injection pump as they can fai,l stop the engine then be ok next time you start up .

Oct 21, 2009 | 1997 Isuzu Trooper

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1998 Isuzu Bighorn Diesel. The car just won't start. My local dealer can start it using a cold start spray. But he has not been able to solve the problem. Please could somebody help


I have a 1998 Bighorn 3.0L if the wrong grade of oil is used in the motor it miss fires and runs rough, due to the injectors being oil pressure controlled, I have heard of extreme cases causing a failure to start when cold. good luck

Feb 17, 2009 | 1997 Isuzu Trooper

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