Re: Isuzu trooper 1999 just started to leak oil and lost...
Leak oil from where?/ Please be more spacific. If it is from the front harmonic ballancer then it si a pain in the Donkey but not expensive, rear seal.... not good, valve cover, no biggie etc.
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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.
Loosing that much could only be the oil pressure sending unit. They blow out. I don't know where yours is exactly, but they are usually on the top, center of the engine in the very back. About three inches long and have a base about 1 1/4 inches in diameter.
Bad leak at the rear main wont give you low oil engine pressure ,its sign that the main bearings are worn or the thrusts .
Check the crank pulley end float and lift first but the main can be done in place drop the gearbox and flywheel.
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?
check oil pressure with test gauge from near large engine oil filter and cooler assembly, to rule out sender unit issue, if same readings check oil pick up sucking air O ring leaking?
releif valves in oil filter cooler assembly, stuck/jamming open?
if vehicle has been sitting for a couple of days and this happens light should only stay on 1-2 seconds go out and then gauge starts reading
have seen this on older higher km vehicles bad ones have balance shaft centre journal in sump worn out (new sump)
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