My Isuzu Trooper 2004 4JX1 turbo just underwent a general engine overhaul. Its cranking but will not start. All electricals are ok. Does the PCM needed to be reset for it to start?

The service and repair manual with diagram will provide you step by step knowledge to locate and fix the problem easily and you will get the manual from the given link https://toolsnyou.com

Will not affect starting at all,just make sure you put the same viscosity in as manufacturer specs

is this the Single head cam or twin version?
no photo of engine, so answers will be weak.

double posted. is this the single cam or twin cam engine?????? per side, the twin cam has 4 cams. 2 /bank.
i can not understand your questions, at all.
ok you overhauled the engine,
nor can i understand , still hard start.
does that mean it cranks slow and turn runs and drive perfectly ?
or cranks fast, but hard to start and runs perfectly?
or does that mean it cranks fast, starts, then misfires and runs crapppy-pappy?
hark, the devil really is in the details, no?

Generic answer.
all the wires and sensors , hoses not put back correctly.
oil full, coolant full, fresh gas in tank,
then you crank engine with no spark (I pull fuses)
and the crank it until oil pressure is good. yah, do that.

if really savvy, we check for top end oiling next. cranked only.


ok looks like oil pressure is good,(I don't want to wreck a new engine) (also check compression on a new engine, to see if we messed up., if not 150psi or more, you timed it wrong)



then we crank it, ok, it cranks and don't start
I check spark and it's timing using my timing light, it's wrong, i retime it, no and its ok. as is ..
ok sparks good, on all 6 cylinders. checked carefully and for static time.

so now start engine on test fuel,
if fails, see above for why.!
ok it runs for say 2-3 seconds and stalls. good.
We yell at the gas engine gods. O'BOY my engine seems to be OK ! progress....

next is fueling , ill stop now, as typing a book on fuel injection
is not easy here.
but fuel pressure is next. on all EFI engines. as is good fuel.
when did car last drive perfectly, 1 month ago,
10 years. what?
if long ago, the gas is bad. as are related parts all gunked up, like filters, and injectors.
and even the pump, or its sock packed in GUNK.
as you can see we have no history on the car, so.
really anything is possible. even vandalism.

btw we never just throw and engine in a car.
we check.:
1: compression, gee even sitting on a pallet.!
why install (6hr labor) a dead engine,?
2: then cranked oil pressure, spark/fuel off line.
same reasons.
3: then if all that is ok, I do check top end oiling now, if not any top end, the cams will not last very long. they will smoke and seize up in a flash.

this is how its done correctly, ask how.

As in lobotomized, heh heh? That sounds like more reverse-engineering than the makers would put up with. Look under the dash, both sides. I really don't know, surprising if it has no modern electronics.

Which car is this? Anyway if its cranking then your starter motor and related wiring is fine. Open the engine oil filler cap or head cover and then try to crank and see if tappets are actually moving or not. You should also pop out the fuel line from carb / mpfi to see if actually fuel is coming out of line or not. Because sometimes fuel pump produce humm sound but do not actually pump fuel.

The most likely cause of check engine light is the o2 sensor.

No its too thick for the injection system .

You may need to consider having an engine overhaul with new piston rings and a turbo

Right way to do this is to match the post position & case size, then buy the battery with the highest cca you can afford. Don't use less than the one that's in the car now. Turbo does not require more cca than non turbo...it creates no extra drag on the engine when starting. Higher cca will help with cold starts and hot weather, generally not being "worked hard" will also extend it's life.

perhaps this is is a good start..will look around more for you also..good luck
http://www.car-stuff.com/mmparts/isuzu-trooper/repair_manual.html

what makes you think the turbo is gone????there are some switches to check before you come to this conculction .please get this engine double checked before you change the turbo and do not fit a second hand turbo unless you are fully sure its [ok]this problem is quit an expenice .adrian;;;