Engine runs perfect. no misfiring at all?>??????
the computer dont know,
all it knows, is a reading fails.
in electroncs we do more testing
it can be bad wires. bad connections or bad sensors.
we use a voltmeter do check this, or a scope if fast moving signal.
1991 2.8L
"Electronic Spark Timing Circuit
Specific to 1992-93 models only.
Indicates that the ECM believes the Ignition Module has failed.
Check the wires and connectors between the Distributor and the ECM."
google finds top anwser here
https://www.2carpros.com/questions/isuzu-trooper-1992-isuzu-trooper-code-42--2
best answer ive ever seen, and for old cars, had to find,
most folks long forgot ..24 years ago
and books long ago in land fill....
SOURCE: Cylinder number for firing order for 1995 Isuzu Trooper
Hi,
Assuming your 1995 Isuzu Trooper is using the 3.2 SOHC engine, the firing sequence would be as shown here.
. This was originally posted here. An actual image 
which was originally posted here.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
SOURCE: Oxygen Sensor on '99 Isuzu Trooper
The O2 sensor is on the engine side (up stream) before the catalytic converter in the exhaust pipe, it is barrel shaped about the size of a jumbo magic marker.
SOURCE: 1998 Isuzu Trooper Shop Manual
The 1998 Isuzu Trooper is identical to the 1996 & 1997 Troopers with the 3.2L V6 motor. Chilton-Haynes have a decnet and detailed manual for this car. It's available on Amazon.com. That's where I got mine!
SOURCE: isuzu trooper 2002 RLV engine. camshaft timing
Sorry for the severe delay.
I am personally going back to answer your unanswered question.
I do not know if you still need the answer, but I am going to answer it in case you still do.
Click on the following direct Link. It has the Timing Belt Diagrams and Photos with Marks for the Camshaft and Crankshaft that you will need. It also has numerous other helpful diagrams, instructions and photo's for use.
Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/2002/make/isuzu/model/trooper/2002_isuzu_trooper_timing_belt_diagram_marks.htm
SOURCE: 2000 isuzu trooper: OBD-II Trouble Code: P0401 Insufficient EGR F
Your SUV is really giving you a hard time, lol. Sorry but I've had those days too.
I would try to check if you have blocked EGR passages. If ok check for restricted MAP sensor vacuum hose/passage or restricted exhaust. I know you replaced the CAT but if the muffler is blocked then there would still be a restriction. Also check the wiring and connection to the MAP sensor.
the 6cylinder with 2 injectors TBI its called.
. This was originally posted here. An actual image which was originally posted here.593 views
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