Question about 1999 Mercury Cougar

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Car rpm idle drop all the way down then shut off

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  • urnmyreality May 09, 2010

    1999 mercury cougar. The veh will idle well for a minute, but then trying to shift from a stopped position gets to be an issue. Have trouble getting it to accelerate when it idling badly. Starts back firing

  • urnmyreality May 09, 2010

    car rpm idle drop all the way down then will either shut down or idle roughly until the rpms rev high enough for the veh to accelerate\r\n
    1999 mercury cougar, v6, 5spd, 2.5l

    The veh will idle well for a minute, but then trying to shift from a stopped position gets to be an issue. Have trouble getting it to accelerate when it idling badly. Starts back firing

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As the car warms up it needs more air.If the iac(idle air control) wont give it it shuts off.So replace the idle air control

Posted on May 09, 2010

  • INDIRA KUMAR
    INDIRA KUMAR May 09, 2010

    The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.

    The IAC is located at the top of the upper intake manifold adjacent to the throttle body.

    Do not attempt to clean the IAC valve. Carburetor tune -up cleaners or any type of solvent cleaners will damage the internal components of the valve.



  • INDIRA KUMAR
    INDIRA KUMAR May 09, 2010

    Turn the ignition switch to the OFF position.Disconnect the wiring harnessfrom the IAC valve.
    Measure the resistance between the terminals of the valve.

    Due to the diode in the solenoid, place the ohmmeter positive lead on theVPWR terminal and the negative lead on the ISC terminal.Resistance should be 6-13 ohms. If resistance is not within specification, the valve may be faulty.




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Your going to have to give a bit more information..

1. Type of car

2.) when does it drop,, as soon as you start (idiling problem or when you turn on the ac ??

Posted on May 09, 2010

  • Rishi Roshan Ali May 09, 2010

    Did you have a diagnostic done on the vehicle ??? Sounds like the throttle body position sensor..

  • Rishi Roshan Ali May 09, 2010

    yeah,, check the throttle body position sensor... I'm betting thats your problem..

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