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2000 Ford Expedition

Question: Rough Idle Only in Cold Weather

Question

studio804, 5.4L V8, Longwood, FL, December 27, 2010, 08:53
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Rough idle in cooler weather below 50 degrees. Runs fine while driving at speed, but rough idles or stalls when stopped. The rough idle clears up after 15-20 minutes or so when the air temp is above 45, but it lasts longer when temps are below 45. No rough or diminished performance when driving - only when decelerating or stopped. Never happens in the summer.

Our mechanic has replaced IAC, TPS, MAFS, EGR valve, spark plugs, coils, wires, fuel pump - you name it! He ran codes and said it was a generic code that didn't tell him anything.

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  • Answer #1

    Superbob December 27, 2010, 20:32
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    Had all those parts actually failed or was he just shooting in the dark hoping to get lucky? A good technician doesn't replace a part unless he diagnoses it and it's bad. Find a Ford specialist.
    Here's a directory link for you:
    http://repairpal.com/directory?address=32750&car_brand_na...

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    Visitor, December 27, 2010, 20:40

    Those parts had actually failed over the course of two years. I guess my reason for posting them was to aid in the diagnosis here. If a code is generic (too rich) how can one really accurately diagnose this issue? I'll check with one of the Ford specialists you linked.

    Thanks!

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    RhondaPerreten, January 02, 2011, 20:14
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    My problem is similar, including it only occuring in colder weather. The difference is my check engine light is now on.

    Did you find out what was wrong? I live in a very small town, and have a great mechaninc, but I am thinking we may have the same problem..

    Thanks,
    Rhonda

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  • Answer #2

    RhondaPerreten January 02, 2011, 20:15
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     Rookie

    My problem is similar, including it only occuring in colder weather. The difference is my check engine light is now on.

    Did you find out what was wrong? I live in a very small town, and have a great mechaninc, but I am thinking we may have the same problem..

    Thanks,
    Rhonda

    Reply
    Flag This
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