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How do I adjust the engine idle speed?

Discussion in 'Stock 2002 - 2005 Explorers' started by arterbery, January 15, 2011.

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    1. arterbery

      arterbery New Member

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      Year, Model & Trim Level:
      2002 Mercury Mountaineer
      have 2002 Mercury Mountaineer have cleaned MAF and replaced air filter engine fault lights have cleared but engine has high idle speed how do I adjust?
       
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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      Welcome to this forum! I've moved your thread into the stock 2002-2005 section. Don't play with the set screw adjustment. You might have a vacuum leak or a bad IAC. What were the previous code numbers?
       
    4. matt0248

      matt0248 Active Member

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      Check for a binding or sticking throttle body. Also, my X had a high idle when it got hot. The hotter the engine got the higher the idle speed. I ended up replacing the IAC with one from Autozone (needed one fast, otherwise I woudl have gotten a motorcraft one). Problem went away.
       
    5. SuRrEaLNJ

      SuRrEaLNJ hail to the king, baby! Elite Explorer

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      you don't, its all computer controlled

      I notice u said cleared fault lights, what were the codes?
       
    6. swetrid

      swetrid Well-Known Member

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      Double ck the throttle cable, sometimes they wear and stick, closely inspect it down at the gas pedal.
       
    7. EasyRhino

      EasyRhino Well-Known Member

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      What is the idle speed as indicated by your tachometer?

      It is true that there is no idle screw adjustment, as it is computer controlled.
       
    8. imp

      imp Well-Known Member

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      Curious when did they go to drive by wire? Thanks. imp
       
    9. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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