Question about 2003 Mercury Mountaineer

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Stalling around 15 30 mph

2003 Mountaineer stalls in warm weather. Cool or cold weather never stalls. Stalling happens at different speeds but mostly around 20-40 mph. No warning just stops. Dearler checked for codes but nothing shows up. 60 thousand miles on it.. One dearler said it could be the air sensor. I have changed the air filter fuel filter have new battery new alternator. All this was replace last summer. It acts like it not getting any fuel or its not getting enough.

Thank you for any kind of help

Dee. olson

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  • dstee4 Jan 11, 2009

    Thank you for responding I have 2003 Mercury Mountaineer.

    In warm weather the suv stalls it starts right up after it stalls

    The stalling happens at anytime but mostly around 15 to 30 miles per hour, or when I come to a slow stop. But then it will happen when I pull out into traffic going a higher speed then i have to come to a stop light and it will just stop no warning. I will put it into netural and start it up. Other times I will get a bit of a jerking motion and warning signal just before it happens so then I will pull to the side of the road and restart. It always starts right up with no problem. This only happens in Warm weather, I live in Michigan winter is no problem.

    Thank you for your help


  • dstee4 Jan 11, 2009

    Thank you for the information I will have .that checked.

    I appreciate your help and time thank you very much.

    Dee Olson

  • Anonymous Jan 17, 2009

    Mine happens regardless of weather. It just happened at 5 mph and 35 degrees while pulling into a parking space. Other times it will happen as explained by others. Seems to happen every 3 months or so, without warning.

  • Dirk McKenney
    Dirk McKenney Apr 06, 2009

    Dee, have you found a solution to your problem? I have something similiar where my Mountaineer stalls if I stop too quickly. I have replaced both front wheel speed sensor which seemed to have fixed the problem briefly.

  • Thomas F. Schneider May 11, 2010

    Fuel lines routed past any warm or hot engine parts? Sounds like vapor lock. 



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I would try insoluating the fuel lines anywhere they go past hot parts.I would also run some fuel cleaner in with a few tanks of gasoline. It has done wonders on my truck of 189k.   Lean or no fuel related problem do not set codes. Too much unburned  fuel sets codes.   

Posted on Jan 11, 2009


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