Question about 1992 Mercury Grand Marquis

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92 grand marquie stalls at idle engine light comes on

If you give a little gas its ok seems to do it more after it warms up

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  • greggyc71 Dec 13, 2008

    Mine does the same thing except no engine light. I notice it more when it's warm. I have to keep my foot on the gas pedal to keep it from dying completely. Ironically enough, as soon as I put it in R or D, the engine speeds up and it runs correctly. Where to start?

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I would venture to guess that your TPS has malfunctioned. The idle holds when the engine is cold correct?

Posted on Nov 12, 2008

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Solutions for 1998 grand marquis that will not idle


Have someone check the fuel pressure. Check EGR pod, you may have a Vacuum leak. Disconnect connector at a part called a TPS which is mounted on a Butterfly flap shaft opposite the throttle cable. Use an Ohmmeter on the TPS and check for smooth changes in Ohms as throttle is pressed.
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