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Low Idle

Discussion in 'Stock 1995 - 2001 Explorers' started by wagonmaster69, September 30, 2018.

^^Searches ExplorerForum.com^^





  1. wagonmaster69

    wagonmaster69 Active Member

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    City, State:
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    Year, Model & Trim Level:
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    I have a 1999 explorer 4.0 ohv.
    Did the top end gasket and seal replacement (yea fun) and new plugs and wires.
    But it has a low idle and left idling it will stall.
    Now is it the throttle position switch or the idle air control valve?
    And how do I find out on with one it is.
    And thanks as always of the help.
     
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  3. koda2000

    koda2000 Explorer Addict

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    If it's the IAC you should get a CEL. I'd try removing it and cleaning it. You should also clean your MAF with CRC MAF cleaner. You can increase the idle by turning the throttle plate stop screw. I believe an OHV should idle around 500 RPM (like the SOHC), but I prefer my idle around 600+ RPM.

    You may find the following video helpful...
     
  4. Turdle

    Turdle Moderator Staff Member Moderator Elite Explorer

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    The idle should not have changed.

    Double check the spark plug wire firing order on the driver side of engine. Very common mix up happens there.
     
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  5. 239

    239 Active Member

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    Here’s my idle in park. In drive, it’s around 600.

    A63B7BAF-1167-49B0-A27E-00BDF1B4D9D1.png
     
  6. koda2000

    koda2000 Explorer Addict

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    891 RPM is high, 600 RPM in drive is normal.
     
  7. 239

    239 Active Member

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    I have an auto zone maf that I installed back in 2011 and an iac that I bought on amazon. It came in a Motorcraft box but who knows. Eventually I’ll switch them out for oem parts.
     

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