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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

idle problem

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Old Nov 23, 2010 | 02:52 PM
  #1  
black bronco's Avatar
black bronco
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idle problem

i got a 93 fullsize bronco with the 5.8 in it my problem is when i fire it up it idles around 1800 for about 15 sec which is fine then after that it lopes from around 1200 to 2000 and continually does that till i put it in gear and some times it stalls if im not quick on the gas. after running it down the road for a while then its fine.
anyone got any suggestions
 
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Old Nov 23, 2010 | 04:54 PM
  #2  
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WINGNUT-
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From: Sodus, NY
I'm trying to solve a similar problem with my '89. It can be caused by quite a few things. Does yours run fine when its totally warmed up?
 
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Old Nov 23, 2010 | 05:23 PM
  #3  
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CWPottenger
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Sounds like a bad or dirty IAC (idle air control) valve...

another possible issue is AC clutch... is it cycling on/off
 
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Old Nov 23, 2010 | 05:38 PM
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taisa899
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From: Cookstown
vacuum leaks can cause all sorts of idle issues too
 
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Old Nov 24, 2010 | 08:06 AM
  #5  
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black bronco
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yeah it idles fine once its hot. thats what i was figuring was the iac all the vacuum lines look good but that doesnt mean a hole lot i gotta put a vacuum gauge on it
thanks for the advice guys
 
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