Top 10 1998 Isuzu Trooper Questions & Answers

In fact, you can. The large transmission pan has two plugs in the bottom. The higher one is a fill plug. The lower one is a drain plug. The proper procedure for checking the level is: A) Drive vehicle until transmission reaches operating temperature (go for a 30 min drive). B) Park vehicle and apply emergency brake, run gear selector through all gears (engine running, pausing 5 sec.'s in each gear) from Park, down, and back to Park (very important to be in park when checking level). C) Immediately remove the upper fill plug and check level with your finger, it should be just up to the hole, fill as necessary. NOTE: If more than a dribble of fluid drains out when you first open the fill plug then it was overfilled or the procedure was not followed. Use a catch pan under the hole just in case. Filling of the fluid is by means of a small pump and hose, commonly found at auto parts stores.

What grade of you do you have ? must be 5/30 fully synth or it breaks down when hot and makes for a misfire.

Go to my profile I have just explained how to change a cv boot on a Trooper. The axle needs to be taken out to change the boot so the same solution. What you call an axle I have refered to as a drive (short for driveshaft) It takes a lot of explaining so save me a lot of writing if you read the solution I gave for changing the CV boot. Cheer's

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 .

Try fitting a seperate transfer pump between the tank and HP pump(quick/cheap fix only) and see if this resolves the problem. If yes check filler cap(no air lock), air leaks in supply hoses or transfer pump(and of course the usual "check the fuel filter").
If not, dig deeper:


J-1-15(not indicated) : Earths glow plug relay to enable glow plug circuit.
ECM : Electronic control module
IS : Idle switch
ECT : Engine coolant temp
OTS : Oil temp sensor
IAT : Intake air temp
FTS : Fuel temp sensor
INJ : Injectors 1 through 4
RPS : Rail pressure sensor
EGR : EGR vacuum pressure
MAP : Inlet manifold pressure
APS : Accellerator position sensor

Seems you may have a similar problem on your machine to the one we've had....The 4JX1 has taught us a lot we didn't know before, but specificly for this particular engine. First I'll advise you check the obvious things...Make sure that your battery is charged fully. I'll explain why later. Next make sure that there's no air in the fuel system....On the filter housing you'll see a ten millimeter bolt, which should be loosened and once loose push the plunger atop the housing to remove any air....If bubbles come out you'll know that that was the problem or part of it. With this particular engine the ORPS (sensor) gives the type of problems you're talking about. The sensor in question is fitted inside the tappit cover into the oil rail (which is the cylindrical pipe fitted over the valve assembly....It has two sensors, one being the ORPS and the other being an oil temprature sensor. To get to these it'll mean removing the tappit cover which means first removing the inter cooler....then the oil feed pipe which fits into the side of the cover, Remove all the screws (five each side and three at each end)....The ORPS is the smaller of the sensors....It is a sensor which operates with a cystal....The oil preesure pressing against it will cause a very small voltage which is actually a pulsed signal....That signal is sent to the management computer and controls the solid state switch which allows the circuit for the injectors to beecome active....Remeber the battery? If the battery is not able to turn the engine at what you'll hear as a normal speed the oil pressure will not be enough to send the signal which opens the injectors....The ORPS (Oil Rail Pressure Sensor) cost's about two hundred and twenty US$ and if you do the job yourself your probably save a similar amount on labour charges....The engine oil is also critical....Only use the recommended oil....If that has not been used....Buy double the amount of the correct oil and two of each filter....Drain what's there and then refill with the recommended oil (once vehicle is up and running) run the engine for thirty minutes or so (pref on the road) and then re drain and again fit the other set of filters and refil....We don't like the chemical engine flush addatives, too dangerous, esspecially in a diesel engine.... Hope this is help Ron Let me know how you get on. you can send your reply to this same web site...I'm one of the experts.... Cheers for now.... Best regards Johngee10

if its diesel 4JX1 its in top cam belt cover cant miss it, sensor is very clearly visible.
if its petrol V6 (6VD1 or 6VE1) its in left head at rear behind inlet manifold
these pictures are for petrol V6, Jackaroo(Trooper) and Holden Rodeo are the same.

will the anti theft system stop your car from starting ? if so how do i rest it on a 1998 isuzu trooper

hyghjacked post from 2014 to 2017 ,

no country stated
3.0 L direct injection diesel engine, turbo, some inter-cooled

this is a diesel fuel in the rad post (my guess wrong, its engine oil)
cracked engine./head,intake manifold or bad headgasket.
freeze damage?
not running 50% anitfreeze coolant and bam? damage.

Most of these use the check trans light to show codes, so if you know how to do the trans "handshake" the light will flash to show you what is wrong.