Question about 2002 Isuzu Trooper

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Engine seems to be misfiring, had 6 sets of injectors rereplaced by isuzu dealers, now they say it may be the rail pressure control valve, what is that item, if so how do you fix it or do i have to go back to untrust worthy dealerships? Please note it is an 53 model.

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Ok it sounds like they don't no what is wrong so there are just going to start replacing everything. It could even be the coil packs that gives your engine spark. Anyway there are 3 things "ECU" which controls and monitors the complete injection process. The 2nd "Rail pressure control valve" which is just a valve that opens and closes to let fuel into your engine. And 3rd the "RPS" (Rail-pressure sensor) which delivers all the measures valves that are required in the process. I would have a shop check the coil packs, RPS, and ECU before you go buying anything else that doesn't need fixing.. :) Good luck man!

Posted on Sep 24, 2009

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In my opinion they should have test drove the car after replacing the injectors they would of found that the vehicle lacked power and wound have finished fixing it. This is not all the dealers fault. Parts and labor being as expensive as they are they fixed the miss but not the lack of power, And since you or they did not know the regulator was bad the mechanic brought mistrust on your part by doing a dis-service by not road testing it after repair to confirm it was fixed. This is not a rip off just didn't complete the job. Had they found the fuel rail regulator bad you may have thought they were trying to jack up the prices to so it's a catch 22. Darned if you do darned if you don't. The fuel regulator will not cause a miss just a lack of power.

Posted on Sep 24, 2009

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1 Answer

I replaced the motor in a 96 isuzu homebre. All the wires are hooked up. The engine will crank but wont start unless either is sprayed into the throttle body. Seems like the injectors aren't working.


first off check that your fuel pump is sending fuel to injection system. Usually there a release valve on the fuel rail somewhere. check it for fuel pressure.

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Misfire in cylinder 6. chaned coils an spark plugs still come up as misfire in cylinder 6. CHANGED ignition coil still comes up. What should i do next?


Plugs get changed at 70,000 miles
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on my 2004 LS,I don't know about yours.

Clean the MAF Sensor with the CRC Product
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Change the 2 front O2 Sensors at 100,000 miles

Check fuel pressure at the fuel rail on engine

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1 Answer

My Isuzu Bighorn 4JX1 RJM Engine stalled after fitting it with new oil pump. It can crank but is emits smoke but not run. What could be the problem? I have tried to check if the fuel pump is not working...


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.

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2 Answers

2002 ford escape 3.0L DTC P0305and P0306 what would you ck


P0305 - Cylinder 5 Misfire Detected
P0306 - Cylinder 6 Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, The Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation

Possible Causes:
- Improper spark plug at cylinder #5 and #6
- Insufficient compression at cylinder #5 and #6
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #5 and #6
- Fuel injector #5 and #6 may be faulty
- Intake air leak at cyli

Possible Solution:
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- Replaced Injector #5 and #6
- Replaced Ignition Coil #5 and #6

Hope helps.

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1 Answer

I have an Isuzu Bighon 1998 3.0 Diesel Dotch Engine which i purchased second hand. It is absolutely great when the engine is hot. It has issues with starting especially after being parked for more than 4...


ISUZU HAS A RECALL ON LEAKY INJECTORS ON THAT TRUCK GIVE THEM A CALL The injectors use the engine oil at very high pressure to inject the fuel, and semi synth oil just can't withstand these high pressures for very long. It breaks down, loses it's viscosity, and then the injectors won't work properly.
Change the oil to fully synth, and you should see a huge difference. (Do both oil filters while you're at it too).
1. Injectors. Usually the electronics in them fail and cause a miss fire.

2. Injector Sleeves. Causing diesel to leak into the sump and in severe cases the oil/diesel mixture filling up to such an extent that the vehicle actually runs on its own, on the mixture. This can cause the engine to rev to the maximum until all the oil/diesel mixture is burned or the engine basically destroys itself.

3. Rail Pressure Sensor. If the E.C.U cant determine what pressure is at the rail the vehicle may not start or stop running . A fairly simple fix with only the rocker cover needing to come off.

4. Rail Pressure Control Valve. This controls the pressure supplied to the rail. Engine will not start if this control valve is faulty.

5. Turbocharger. A very unreliable unit. Seals usually go after 50000miles.

6. Dual Mass Flywheel. Seldom give trouble but I have seen a few that have. If the new flywheel is taken off and not put back in the same way as the old one (lined up via a half moon shaped mark) the engine will not start as the flywheel sensor will be unable to determine the position of the flywheel.

7. Throttle Position Sensor. Fairly troublesome. Usually no deteriation in driveability but will bring on the engine light.

The engine is a gem when running correctly but unfortunately its a rare occurrence. I think the 02 onwards models had a lot of modifications done to them such as improved injectors etc.

Dec 15, 2010 | 1993 Isuzu Trooper

1 Answer

Misfire on cylender 1 dealer says it is fuel injector 1, could be pluged up or need replaced. dont have money for dealer to fix. how hard is it to fix myself?


Actually not that hard, but it does require some tools. Normally you will find the fuel rail fastened down in some manner on top of the fuel injectors along that side of the engine. First step is to find the relief valve (looks like a tire valve), be warned that fuel will be under some pressure when you push this valve, do not do this on a hot or warm engine and put a rag around the valve to catch excess fuel.

Remove the fuel rail, then carefully unplug the wiring connector on the # 1 cylinder fuel injector. The injector should come out with a good firm tug, make sure that any O-ring has not been left inside the injector seating area. Place a single drop of oil on the new injector's O-ring and push it into place. Replace the electrical connector, then the fuel rail. Turn on the ignition, but do not start yet - check for any fuel leaks. If none, then start the engine and you should be good to go.

May 03, 2010 | 1999 Buick Regal

1 Answer

Some times hard to start then tick over lumpy then clears and run well then when revs drop engine cut out will not start no faults found on diagnostic


Is this the 3.0 diesel ? Most likely the rail oil pressure sensor is faulty but wont show as a trouble code cos it reads pressures  from 0 - 27Mpa and can  show pressure  even when  its not there ,hard to spot but pull the white wire from the car side of the injector loom by the dipstick and see if that sorts it out-  or the rail oil pressure control valve - this should show as about 20% on tech 2 at idle  if it goes below 15% the engine stops again no code will set .

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1 Answer

Have a 1999 Toyota Tacoma with a 3.4. Vehiclw was brought in 4 pinging under acceleration. Check engine light was on with a TPS code. Upon diag we found the plugs very worn. 140K on vehicle so we did a...


Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.

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1 Answer

Error codes, oil pressure sensor and engine control moduale


Hello, It should actually be an oil sending unit, and is located on the back of the intake manifold to the left of the distributor. *The P0523 is Oil Pressure Sending Unit Voltage too high *P1693 Generic fault indicating a fault in the bus or PCM/ECM interface *P1682 - I can't find this code Anyways, I will post here all the error codes for future reference. 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Jun 11, 2009 | 1999 Dodge Ram

2 Answers

No pulse at injectors


The normal way that injectors are controlled is via the permanent application (ignition on obviously) to one side of the coil that operates the enclosed piston, and the precisely timed application of ground (negative) to the other side of the coil. The transistors that control this switching under the command of the engine computer are typically contained within the computer itself. Measuring the voltage at the injectors is not productive since the common multimeter is incapable of detecting the very short pulses that activate the coil. Some kind of visual means would be needed to observe this pulse such as an oscilloscope or an engine analyzer equipped with a 'scope.
It's unlikely that all of the switching transistors (or the injectors) have failed simultaneously so either the computer has a problem or there is no fuel being delivered to the fuel rail that feeds the injectors. You should find a pressure regulator that sits between the fuel line coming from the tank that controls the fuel pressure for the injectors. This device seem to be a sore point in many vehicles and can make it appear that the injectors are not working. Many fuel rails have a fitting similar to a tire valve to allow the testing of the pressure being delivered. I would recommend you check this before assuming that the injectors are at fault.  

Sep 08, 2008 | 1994 Isuzu Rodeo

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