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Cold weather problem...

Discussion in '1994-2004 V6 Mustang Tech' started by dgb1940, Nov 20, 2017.

  1. dgb1940

    dgb1940 New Member

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    I recently had my '02 3.8 litre checked and nothing came up on the codes. But for some reason it likes to drop rpms when coming to a stop. Then come back up. It did not do this when it was warmer . But now on cold days it seems there is this issue. It does seem to have a rough idle when it's cold and won't come out of that.
     
  2. IRA

    IRA New Member

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    Could be a maf issue. The maf sensor contains 3 critical sensors to the pcm. Barometric pressure, intake air temperature, and mass airflow entering the engine. If any of these are not reading correctly they can cause a rough idle when the weather changes. The problem is if they are failing within their programmed parameters they won't throw any codes. Example intake air temp is reading 98 degrees when the temperature outside is 38 degrees.
     
  3. dgb1940

    dgb1940 New Member

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    I live on gravel, could it be dirty?
     
  4. IRA

    IRA New Member

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    Absolutley, if you remove the sensor and look at the tiny wires they should be clean. If they appear fuzzy they are dirty. Replace this sensor do not clean it. Do you have a factory intake or a cold air intake?
     
  5. dgb1940

    dgb1940 New Member

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    It's a factory intake. If I have to replace it every three months or so I ain't gonna be happy. That's how long I have owned this car.
     
  6. douglass

    douglass Active Member

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    Did you try a different Key?
     
  7. dgb1940

    dgb1940 New Member

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    Why, would the key make a difference?
     
  8. douglass

    douglass Active Member

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    To rule out the module in the key being bad.
     
  9. IRA

    IRA New Member

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    Have you done a tune up recently? The factory intake is far superior to any cai, for keeping the maf and the engine clean. If you haven't done a tune up yet i would recommend one. Spark plugs n wires, and a fuel filter are general maintenance. Don't forget the oil change.