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Isuzu dmx starts sometimes,after a short duration it stalls what might be the problem?i have changed another ECU

The fuel pump opens fuel for a very short duration and then stops

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  • 473 Answers

Try changing the fuel pump first or have a diagnostic done on it

Posted on Nov 20, 2014

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 188 Answers

SOURCE: engine stalling on a 2002 chevy tahoe z71

Still sounds like a fuel problem. Try a full tank of supreme gas, plus put a can of SEAFOAM into the tank to help clean you injectors. See if this will help clear up your problem. Did you change the plugwires????

Posted on Feb 08, 2009

  • 166 Answers

SOURCE: 1997 Geo Metro Stalling

After driving for a while and the engine becomes hot, when you park the car for a while, does this "for a while" mean enough time for the engine to cool down or not?

The reason why this is important is because an engine can stall for a number of reasons, and finding out the conditions of its stalling obviously helps narrow down the cause of the stall.

If it stalls, you say, when the engine cools down after being parked for a while, this handy diagnostic article will help assess the cause of your problem:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_Cold.htm

If it stalls again, like you said, after warming up and driving for a bit, the ambient temperature may be too as well as the engine itself, which then you should be inclinde to read this diagnostic article:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_Hot.htm

You may very well be right its due to fuel starvation, particularly as to the malfunctioning of the EGR, as noted in the article.

I'm sure these articles will provide you with great insight.
Good luck!
Brad

Posted on Jun 02, 2009

  • 1341 Answers

SOURCE: 01 kia optima stalled and wont start...starter just clicks

It seems the starter is playing up.First check if your battery is charged fully or try to jump start and see what happens.If the engine start then it's either you need a new battery or else you need a replacement alternator.Test using a voltmeter if the actual altenator is working.Finally the last option is the starter motor that needs changing or fixing...Hope this helps.

Posted on Jul 03, 2009

  • 117 Answers

SOURCE: 2002 Dodge Caravan hesitates and sometimes stalls

A fuel pump would cost around three to five hundred dollars, you have to drop the gas tank to replace. i would condsider making sure that is the problem. You should have the fuel pressure tested, you may have another problem. I would make sure you dont have a vacuum leak, misfire, or other causes idle air control pintle could be sticking due to contamination and depending on the engine a bad mass airflow sensor. Do you have a check engine light on if so go to autozone have them read the codes and post back. Alot of mechanics always go straight for the fuel filter and it almost never is the problem.

Posted on Jul 08, 2009

  • 2 Answers

SOURCE: 991 Isuzu 2.6l petrol runninf problem!

I realise you have probably solved this problem by now so sorry for the late news mate . Had a similar prob and it turned out to be an alternator malfunction . I replace the brushes and off she went . These things send voltage from the alt . to a fuel pump relay or whatever so the pump wont run if the eng isn't (or the alt isn't outputting any voltage.) . Hope you already had it sorted . But I hope this helps if not . Cheers Simon .

Posted on Aug 15, 2009

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2 Answers

98 Isuzu Rodeo Fuel pump not working Fuses and relays goodNew fuel pump


no engfne even stated.
why not say what "not working" means.?
Engine cranks ok but will not start, RIGHT?

Ill pretend fuel pressure is 0 PSI cranking right.

IMMObilzer light glowing? bingo.
interial switch tripped (was in a crash>?)see photo below...
The PCM sees dead spark so cuts all fueL? sure.
(it will, if it does?, scan it yet? cranking, that be first.)
The PCM can cut fuel for many reasons.
2 dead sensors, and spark dead on the tacho line.
1,2,3 bam
and immo set. 4
and the inertial switch, if fitting many are not.
what matters most (1st) is 12vdc to the pump actual cranking, does it have 11vdc at least>?
if you see 12vdc and PSI is 0 or not spec cranking
at the rail, then the filter can be clogged.
not just a dead pump,, i cant hear pumps cranking so.... i use TOOLS> to see whats going on.

to a DIY, vast answers.
1: makes noise.
2: fuel rail drips or not.
3: 12vdc missing to pump or not, cranking?
4: 0 (zero) PSI pressure at rail cranking
????????????????????????????73b921c7-283e-4e01-b41c-91603ea9ac08.jpg

Jul 20, 2015 | Isuzu Cars & Trucks

1 Answer

Hi i got a gwm 2.8 TD not starting.check all fuses.tested injector pulse with diode test light and no pulse found.tested ecu with another gwm 2.8 and is starting with my ecu.


Not sure what a diode test light is, but I would check with a DC voltmeter for a 12 volt pulse. The pulse is very short in duration, so you might not see it. Check for spark at the spark plugs. If fuel pump is bad, you won't have fuel pressure. There are numerous reasons for an engine not starting.

May 05, 2015 | Cars & Trucks

2 Answers

Trouble starting, gauges going haywire


Sound like an Ecu
I had a similar problem on a Vauxhall Corsa changed the fuel pump, Fuel filter, fuel pump relay but same prob i cleaned all the grounding points there was so many codes. I then opened up the ECU and found a broken wire re soldered it back in place and all the codes went away no cutting off in the midst of a roundabout
hope this helps

Sep 24, 2017 | 1997 GMC Jimmy

1 Answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

Feb 13, 2011 | 1992 Ford Thunderbird

1 Answer

I have changed everything: Spark plugs, Wires, Coil Packs, Ignition Control Module, Air Idle Control Valve, Throttle Position Sensor, Map Sensor, Cleaned out my PCV valve. My EGR Valve is in great shape so...


There are three components that will enrich the fuel mix: 1)engine coolant temperature sensor. If this is not working or the signal is interrupted by a wire breakage then the engine will run rich. The coolant sensor informs the ECU (high resistance) that the engine is cold at start up and so the ECU responds by increasing the fuel injection cycle to enrich the fuel air mix. Later on as the engine warms the resistance of the coolant sensor drops and the injection cycle is reduced by the ECU. If the sensor is faulty or has become disconnected (wire break or corrosion of the socket pins) the ECU assumes that the engine remains 'cold' and the engine runs permanently rich. 2) O2 sensor, operates completely independently of the EGR, if it is faulty and signals 'too much oxygen' then the ECU will significantly enrich the fuel mix to try and balance what it thinks is an excess of air. 3) Fuel pressure regulator. If the diaphragm has broken or there is a leak in the vacuum line this will result in higher than needed fuel pressure in the fuel rail at idle. The vacuum line acts against the spring pressure holding the valve closed. At idle, the inlet vacuum pulls back on the diaphragm reducing the fuel pressure required to open the valve. Low fuel pressure coupled with short duration injection times will mean a lean mix at idle. If the vacuum is compromised or the diaphragm damaged then the increase in rail pressure will make the fuel mix very rich to point of flooding the engine

Nov 02, 2010 | 1993 Isuzu Trooper

1 Answer

2000 Isuzu Rodeo ls V6 4 wheel dr.


Check the fuel pressure it could be the fuel pump or pressure regulator.

Apr 28, 2010 | 2002 Isuzu Rodeo Sport

1 Answer

Engine Stalling and stumbling at highway speeds


thats it may be the fuel pump, and the reason why its worse when cold its becouse, when you start the engine cold it needs more fuel to function properly and hold a good idle until it gets its normal operating temp, during these moment the ecu increases the injectors pulse duration to get more fuel to the engine and perhaps a low fuel pressure will give bad fuel atomization and it gives you bad idle and cruise quality, I recomend you to check your fuel pressure for abnormal readings it can be easy by the injectors fuel rail, i hope it help's good luck

Jan 03, 2010 | 2001 Dodge Ram 1500 Truck 2WD

3 Answers

Where is the computer mounted?


I think that the ECU (computer module) is located inside the motor compartment, on the left front corner of engine compartment

Jan 03, 2009 | 1988 Pontiac Bonneville

2 Answers

Fuel sistem


Look for the fuel pump relay and replace it.


Robert

Sep 21, 2008 | 1995 Suzuki Sidekick

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