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Adjust Idle speed 98 explorer

Discussion in 'Under the Hood' started by gulfjack, March 17, 2008.

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    1. gulfjack

      gulfjack New Member

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      My 98 explorer 4.0 ohv 104K idles at 1000 and sometimes drops to 800. I replaced the IAC and cleaned the throttle body. I suspect the tps but don't know how to adjust it or what voltage I am looking for and where to measure. Can anyone help?
       
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    4. gulfjack

      gulfjack New Member

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      Thanks BB. My tps voltage is .955. I don't see any need to make the mod.
      However the engine still idles at 900-1000. The throttle plate is fully closed.
      Any ideas on how to get the idle speed down to 600-700. Is the idle speed supposed to be 1000 on a 98 exp ohv?
      My 2002 exp idles at 600-700.
       
    5. kfkodiak

      kfkodiak B

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      How's your air filter? It can cause a high idle if it's dirty or otherwise restricted.
       
    6. gulfjack

      gulfjack New Member

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      Air filter is new, IAC is new. PCV is new.
       
    7. Firestorm

      Firestorm Active Member

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      Do you have any cracked vacuum lines?
       
    8. aldive

      aldive Elite In Memoriam

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      Are you basing the idle speed on the truck's Tach?

      If so, hook up a scanner and see what that says.

      Good luck ....
       

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