Adjust Idle speed 98 explorer

[gulfjack]

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?

 

[BrooklynBay]

Welcome to this forum! There is a thread on this procedure: http://www.explorerforum.com/forums/showthread.php?t=79362

 

[gulfjack]

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.

 

[kfkodiak]

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

 

[gulfjack]

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

 

[Firestorm]

Do you have any cracked vacuum lines?

 

[aldive]

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

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

Good luck ....