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#1
April 25th 06, 05:42 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
99 Explorer, 4.0 SOHC, auto trans. Engine starts and runs fine, but after
it warms up the idle speed jumps around from 900 rpm to as high as 1500 rpm whether in gear or not. Can anyone help with what the problem might be and how to fix it. Thanks, Dennis 
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#2
April 25th 06, 06:26 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
Vacuum leak ??? and/or
Leaking intake gaskets ??? and/or Binding iac valve ??? C.E.L. on ???????? any codes ??????? If no codes its usually dirt related, dirty t-body and /or iac valve "retired828" > wrote in message lkaboutautos.com... > 99 Explorer, 4.0 SOHC, auto trans. Engine starts and runs fine, but after > it warms up the idle speed jumps around from 900 rpm to as high as 1500 > rpm whether in gear or not. Can anyone help with what the problem might be > and how to fix it. > Thanks, Dennis > >
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#3
April 25th 06, 07:07 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
The problem just started suddenly about 5 days ago. I don't have any code
info or know where to start troubleshooting to see if its a vacuum problem or something else. I also don't know what an IAC is or where the IAC is located on the engine. Any further help would be greatly appreciated.
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#4
April 25th 06, 06:56 PM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
IAC = idle air control .I forget EXACTLY where it is on the throttle body.
It controls the idle speed. "retired828" > wrote in message lkaboutautos.com... > The problem just started suddenly about 5 days ago. I don't have any code > info or know where to start troubleshooting to see if its a vacuum problem > or something else. I also don't know what an IAC is or where the IAC is > located on the engine. Any further help would be greatly appreciated. >
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#5
April 26th 06, 04:35 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
The IAC was replaced last December by my Ford dealer. Could the new one now
be going bad or should I being looking elsewhere for the problem?
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#6
April 26th 06, 06:06 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
Is the CHECK ENGINE light on ?????
If so, goto pepboys and have the codes read, they do it for free but don't buy anything !!!!!!! "retired828" > wrote in message lkaboutautos.com... > The problem just started suddenly about 5 days ago. I don't have any code > info or know where to start troubleshooting to see if its a vacuum problem > or something else. I also don't know what an IAC is or where the IAC is > located on the engine. Any further help would be greatly appreciated. >
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#7
April 27th 06, 05:25 AM
posted to rec.autos.makers.ford.explorer
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fluxuating idle speed
As stated before, no lights then its usually dirt related, clean t-body and
air idle control valve with t-body cleaner You might have to soak the iac valve Just GOOGLE it, for instructions "retired828" > wrote in message lkaboutautos.com... > There are no dash warning lights that come on when this happens... >
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