Question about 2000 Mercury Grand Marquis

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CAr Stalls engine temperature warning light turns on

I have a 2000 grand marquis. It stall once it reaches normal operating temp and put in drive and increse speed. The temperature warning light turns on just before the car stalls. I have replaced both coolant temperature sensors but the problem still persists. Need help diagnosing. Thermostat? PCM?

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  • zavala_g Jan 20, 2009

    Thanks for the suggestions I'll try it and let you know.

  • zavala_g Jan 21, 2009

    Tried the thermostat - nothing. Thanks.

  • zavala_g Jan 23, 2009

    Received error P1740 the temperature warning light still turns on and immediately off the Overdrive light does the same the the check engine light turns on and the car stall - most of the time when it is in drive.



    I was told it may be a transmission control sensor?

  • Anonymous Mar 19, 2014

    will not shift from park to drive without stalling

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Next step is thermostat

Posted on Jan 19, 2009

  • Rob Houg
    Rob Houg Jan 21, 2009

    What you want to look at now would be. Catalytic converter being plugged this could cause the car to overheat. But unlikely in your case unless the car has power issues even before it overheats.

    Is the coolant system bled out so there are no air bubbles etc.


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1 Answer

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That second sensor provides info which sets curb idle and timing advance. The "Cold start" feature is a part of this. The hic-cup is something of a bucking symptom as the engine controls toggle between hot and cold run settings repeatedly as water temperature is not stable.
In the past, I found several 1984 engines having defective thermostats which are tied into "Step-up" solenoids for the curb idle. What happens is idle speed is suppose to drop when the engine is hot.
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