Oil burning or excess gas not being fully burned. If gas, smoke will be very black, whereas oil burning has a bluish tinge. If your engine runs good otherwise, it is probably oil burning. Most common cause of that is worn piston rings.
no engine stated, are we to guess,that, gas or diesel and size? dark some is rich, un burned fuel, and smells like ,yes,unburned fuel, and is cause for 50 reaons, post engine type and size, and county, as each county use different fueling an spark systems., not one I can guess, unless stated, be the first ever todo that, it be like Chrismas here.
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SOURCE: 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 .
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 :
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.
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. "
SOURCE: 4jx1 probale cause of smoke
normally if its white smoke it can be that you have a blown head gasket , if its black smoke, you probably have oil fouled spark plugs, which are normally caused by bad rings or valve seats,,
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
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