20 Most Recent 1998 Isuzu Trooper Questions & Answers

Jack up the wheel ,take off the allen screws (no oil) then see a locking ring with 3 cross head screws which will be very tight. take them out turn the adjusting ring cockwise and spin the wheel till the play is gone then get the next set of holes in line so there is a tiny bit of load on the bearings and bolt it back up - job done .

1998 Isuzu... | Answered on Jul 30, 2020

Get some BLUE DEVIL and follow the Directions. You have a Blown head Gasket or a Cracked Intake or Head.

1998 Isuzu... | Answered on Sep 16, 2019

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

1998 Isuzu... | Answered on Apr 17, 2019

You need to replace the filter in the transmission and clean the body valve add new oil ,I do believe this transmission need it,all the best.

1998 Isuzu... | Answered on Feb 04, 2019

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

1998 Isuzu... | Answered on Sep 22, 2018

Sends a signal related to the rail pressure as a voltage to the ECM. 3 wire connector :
  • Red : 5V (Feeds from ECM connector J1-4) Shared with MAP sensor, EGR pressure sensor and accellerator position sensor.(compare values from these sensors and ECM connector)
  • Black : Ground (Feeds from ECM J2-22) Shared with the same sensors mentioned above
  • White : Signal feeds to ECM connector J2-22
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.

1998 Isuzu... | Answered on Apr 10, 2018

identify the oil leak location and replace the gasket where the leak is originating from.

1998 Isuzu... | Answered on Mar 26, 2018

I think you should buy repair manual first for your vehicle after that it will be easy for you to solve the problem. Check the link may be you will find something useful here
1998 2002 Isuzu Trooper Service Repair Workshop Manual DOWNLOAD

1998 Isuzu... | Answered on Dec 04, 2017

Close the EGR, check whether still noise is there.
If so EGR regulator has to be replaced

1998 Isuzu... | Answered on Jun 19, 2017

Sounds like you didn't run the engine in. Check the oil for mangled main bearings.

1998 Isuzu... | Answered on Jun 14, 2017

On the next "above freezing" day, force lubricant through the throttle cable and lube all linkage at the engine end and interior.AND BEFORE STARTING for the next while try depressing the gas pedal and make sure it is releasing fully.
If it ever gets stuck again SHUT IT OFF before you damage the engine with high RPM on a cold engine.

1998 Isuzu... | Answered on May 21, 2017

no engine stated.
details are based on that..
so is it still the old pump there,
this is very simple
using a volt meter. (the pump has 2 wires, measure across those)
back probe that connector to the pump. 2 pins.

12vdc cranked, if you have 12vdc cranked
but fuel pressure is 0 the pump is gone
no pump runs on 0v, or 6v, its 12vdc there,
i can not understand those fues tests
if the voltage fails to the pump it can be
the power wire or ground wire failing .
do all tests connected, or the readings will be useless.
connected is live testing, under full real conditions
and win. every time.
if ground is tested and rises to 12vdc cranked, ground is bad.
only Ohms laws here,a simple equation.

not sure why your float fails. my guess its bad.
and easy test using ohms, disconnected.
that is another problem.

ill look at your fuse, pretend V6 engine.

the service manual shows
f10 fuse is fuel pump
12vdc both side cranking is a GOOD FUSE.
note all words above.
F10 gets all power from pump relay,
so if you dont crank the relay can be off line
an F10 will be dead.
(the schematic is clear)

here is a facts on all cars, next (pure software in PCM )
  1. pump only runs 3 seconds key on, ,
  2. pump never runs, if not cranked.
  3. run cranked and all run if engine stays running.

see? and varies by year, engine, and even ECU upgrades
so a SAVVY mech always cranks to do tests.
that means its a 2 man job. sorry but that is a reality of working any car until you learn what yours does.
warning have a care here that changes rule 1 to 2, below 20F out door temps, (fun no?)

crank and measure like this.
the pump has 2 wires, red hot, black ground
meter across, pins 1 to2, red back is 12vdc cranked
meter black tests lead (volts) to body perfect metal ground
and meter red lead to pin1 red shows, 12vdc cranked
12vdc means 10 to 12vdc cranked, (battery does that)
then move red test lead to pin 2, black
cranked, 0v, if see 1 volt or ore the ground called.B26 is bad.
if the pump has 12vdc on it, you hear it,
do not run it dry its fuel cooled and fuel lubricated or you wreck it.
if it is heard to run you then see fuel spec fuel pressures.
or its bad. (30psi?)



1998 Isuzu... | Answered on Mar 13, 2017

lost the operators guide.
and guess what, many have asked, 1000s if you google.
ever like google>?
omg, the first hit, I guess, my keyboard, is better....


why not buy the manual,

1998 Isuzu... | Answered on Dec 07, 2016

run the fault codes and check for crank/ cam position sensors
broken timing belt, fuel problems
diesel check for air in the fuel system

1998 Isuzu... | Answered on Nov 20, 2016

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.

1998 Isuzu... | Answered on Sep 12, 2016

check fuses and relays --a few reasons no power -low or no freon --compressor bad --climate switch bad --loose or damaged wiring

1998 Isuzu... | Answered on Sep 12, 2016

It has one and it does need fluid

1998 Isuzu... | Answered on Jun 12, 2016

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