Question about 2001 Isuzu Trooper

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My 2006 Isuzu 3L showed the check engine light and the engine stopped running. When checking fuel from the injector pump it only comes from the return pipes only. The engine does not start.

Posted by Anonymous on


6 Suggested Answers


6ya staff

  • 2 Answers


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Posted on Jan 02, 2017



  • 3113 Answers

SOURCE: 2004 Isuzu Rodeo 3.5ltr 4X4 hesitation/misfire acceleration

The upper intake gaskets may be leaking. They are made of plastic and metal and will leak air. Do not remove the cover on very top of manifold when changing.

Posted on Jul 24, 2009



  • 1 Answer

SOURCE: 2006 Isuzu 4x4 D-Max Chronic sensor problems "

perhaps this is:
replace EGR valve

Posted on Oct 04, 2010



  • 19396 Answers

SOURCE: 2001 Isuzu Rodeo 54248 miles


If problem is only on startup and when idleing, then the problem is likely IAC system, also a vacuum leak will cause the same problem.

If problem is not only on startup and idle, but also when driving, then MAP sensor and EGR system must be checked.

Check also accelerator cable state and setting.


The first thing to do is pulling out the OBDII fault codes stored in the ECM. This is done connecting a code reader to the ECM diagnostic port. The job can be done for a small fee at any local garage, and it is done for free at AutoZone.

The codes will help locating the problem.

About possible faults:

Problem is stalling when idling and during startup, but engine idling fast all the time. Problem not starting at times it is due to the fact that the wrong mixture is being sprayed, this is probably causing flooding and misfire. Since the CEL is on, one of the codes returned is probably misfire.

Check accelerator.

Check IAC system. This is composed by a valve and a solenoid that check and control amount of extra air air when the engine is idling. The IAC valve is located on top of the throttle body.

Check the vacuum system and try cranking with gas tank cap off. Vacuum system is tested using an hand tool gauge onvacuum lines while spraying card cleaner on the hoses (or heating them with a torch). If there is a leak, pressure will go up. A big leak will also do hissing noise, and will often result in a lean code when doing an OBD code scanning.

This kind of symptoms can also be caused by weak wiring to MAP/MAF sensor (MAP in this engine).

If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.

As first thing I would do a code scanning. This car is OBDII. The scan can be done for free at the nearest Autozone, or for a small fee at any garage.

If you get any OBDII code from the scan, report it here, so that we can individuate the possible reason for the problem.

If you repute my solution helpful, then please take some times to accept the solution. Providing good repair tips requires time and skills, and your feedback is important for us.



Posted on Oct 26, 2010



  • 4803 Answers

SOURCE: So my 1995 Rodeo will

First things first...Rewiring the fuel pump will only put a "Bandaid" on whatever the problem really is and will most likely create a situation where wires are draped across places where they shouldn't be, causing all kinds of future electrical problems. I have had to clean up that type of mess too many times.That type of "shade-tree" repair makes proper diagnosis and repair of a vehicle nearly impossible, even by a trained technician. My recommendation: DON'T EVEN THINK ABOUT IT!

OK, Now that I have my preaching out of the way...
The check engine light is supposed to come on every time you turn the key to the "On" or "Run" position before starting the engine. This is for a "bulb-check" just to let you know that it is not burned out. It should go out immediately after the engine starts and should stay off the entire time you are driving the car. It is not any type of indicator to let you know that the fuel pump has run. If your check engine light is not coming on every time you turn the key to "On", then there is probably a problem with your ignition switch or your ECM Main Relay. Either of these can cause an intermittent failure of the ECM to power up, a)d thus, not turn the check engine light on. Failure of the ECM to power up will also cause the fuel pump to not run because like the check engine light, the fuel pump is controlled by the ECM. (Rewiring the fuel pump will not make the engine start if this is in fact what the problem is.)

I have also seen many fuel pumps that run when they want to. You could have a bad fuel pump, but refering to your statement about the check engine light, I would guess that the fuel pump is not the main problem or even if it is a problem at all.

Posted on Dec 29, 2010


Steve Hurc

  • 459 Answers

SOURCE: My Isuzu Bighorn 4JX1 RJM Engine stalled after

the engine oil pumps are in the rear of the engine(trans out) and behind flexplate /flywheel, were any of these 2 engine oil pumps touched if so the flywheel /flexplate has to be timed to crankshaft position, so you might have it in the wrong position, if your talking about the diesel lift pump (injector pump) that also supplies high pressure engine oil to injectors, after replacing this there is a learn procedure for the rail pressure control valve that is on pump. this can only be done by dealer or some one with Tech2 scanner tool.

Posted on Jan 22, 2011

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