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Adjust Idle speed 98 explorer

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Old 03-17-2008, 11:16 AM   #1
gulfjack
Mississippi
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Adjust Idle speed 98 explorer

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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Old 03-18-2008, 12:10 AM   #2
BrooklynBay
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Welcome to this forum! There is a thread on this procedure: http://www.explorerforum.com/forums/...ad.php?t=79362
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Old 03-20-2008, 04:34 PM   #3
gulfjack
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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.
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Old 03-20-2008, 05:04 PM   #4
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How's your air filter? It can cause a high idle if it's dirty or otherwise restricted.
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Old 03-20-2008, 05:13 PM   #5
gulfjack
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Air filter is new, IAC is new. PCV is new.
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Old 03-20-2008, 09:13 PM   #6
Firestorm
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Do you have any cracked vacuum lines?
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Old 03-20-2008, 09:27 PM   #7
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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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