Question about 1999 Mitsubishi Montero Sport

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I finally got my 1999 Montero Sport Limited 3.5 to run,but now the problem is that it starts fine when cold and as soon it gets normal temperature hesitate and the RPM's go down and dies,what coul

We changed the Time Chain,Spark Plugs,Wires,Ignition Module,EGR Solenoid Valve,the head seals,the alternator,the Battery,Mass Sensor,fuel pump is ok,filters are clean,new crank shaft,new cam shaft sensor, so it starts fine,but once gets to the normal temperature goes down RPM and starts shacking and the dies.

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  • jsalome64 Jan 10, 2013

    Crank sensor replaced,fuel filter replaced. It has to be something that gets hot and stop the car, come on guys some one has to know what's happening,like 4 different mechanics checked ot already and no one has any idea what the problem is. One more detail,when I unplug the Mass Sensor and start the car again, it runs all the time but then the engine check lights is on,when I plug it back it runs for a while and stalls or stop running.

  • jsalome64 Jan 10, 2013

    But that Mass Sensor is new,so it can't be that sensor.

  • matthew czap Jan 11, 2013

    could be a faulty mas air ,might be bad to start with right from the dealer

  • jsalome64 Jan 12, 2013

    if it is the Mass Air Flow Sensor,the check engine light should come on,right,but that light is off,it comes on when I unplug the Mass Sensor

  • jsalome64 Feb 03, 2013

    Ignition coil,wires,spark plugs,crank sensor,cam sensor, coolant sensor,thermostat, 02 sensor,mass sensor,everything is new, and there is not check engine light. when I unplug the Mass sensor it runs fine but the check engine light comes on, so what is the prblem?

  • jsalome64 Mar 23, 2013

    you need a new computer or ecm, that is a often problem in monteros,they are very complicated electrinically ,you will need to replace the ecm unless ypou know some one who can reset it,but like I told you it's very difficult do do it.,and I wouldn't re comend a used one,they are very delicate,a new one could cost you around $6 to 700 hundred.

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Have they changed the fuel filter? What is the pressure in the fuel lines it should be between 30 and 40 psi

Posted on Jan 08, 2013

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SOURCE: I have a 96' galant

The condition you describe is usually caused be a vacuum leak. You should check all vacuum hoses for tightness.
Maybe PCV valve or things on that system.

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Sounds like a bad ignition coil. Have it tested.

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SOURCE: runability problem 1999 mitsu montero

my nissan did that and i replaced the crank sensor and seemed to help thr problem.but that was nissan.fix the cheapest first if not sure

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It sounds to me like the ICM ( Idle control motor )

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Testimonial: "I am in the process of this... changing the ICM, I ordered one from Ebay at 100 dollars (cost range from 250 to 350) BUT the gasket was not included."

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