5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Surging idle

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Old Apr 28, 2007 | 12:35 PM
  #1  
LOUDexhaust's Avatar
LOUDexhaust
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From: SC Upstate
Default Surging idle

I got what I think is a fairly stock 5.0 and my idle is really rough. It will go up and down 500 rpms. I believe this is a sensor issue especially since there is aftermarket cam. So, what sensors should I check, that would affect my idle so much?
Old Apr 28, 2007 | 12:38 PM
  #2  
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mattdel
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From: Spfld, MA
Default RE: Surging idle

idle air control, bolted to the throttle body, facing the front
Old Apr 28, 2007 | 12:54 PM
  #3  
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blackride
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Joined: Aug 2006
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Default RE: Surging idle

I had the same problem on my 92. I got it Dyno tuned and it is running fine now. The techs there told me that if you get a different cam than stock you should definetly get a tune. I am a noob at this stuff so someone can tell me if I am wrong.
Old Apr 28, 2007 | 12:58 PM
  #4  
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mattdel
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From: Spfld, MA
Default RE: Surging idle

you shouldn't NEED a tune, but it helps. Unplugging the battery for 10 minutes will reset the computer, and the computer should be able to re-learn everything it needs to keep the car running decent, especially idle, unless you have a wicked cam.
Old Apr 28, 2007 | 05:59 PM
  #5  
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LOUDexhaust
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From: SC Upstate
Default RE: Surging idle

I forgot a word in my original post, there is NO aftermarket cam. I actually did clean the idle control sensor yesterday but that was it. Didn't change a thing.
Old Apr 28, 2007 | 07:40 PM
  #6  
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dv3
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Joined: Jan 2007
Posts: 661
From: denver
Default RE: Surging idle

search for reset idle .....not sure if its on here or not might need to google it
.....basically just ...start /unplug iac and set idle screw on front side of tb to idle how u want / unhook ur battery for 10 mins/ plug in iac/start with no accesories and let idle fr 2 mins/shut off /start run with all assecories on for 2 mins. /shut down
...think thats goes...but u should search to get it right
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