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.

5.0 Idle goes up and down help !

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Old 03-19-2009, 10:39 AM
  #1  
ibayter
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Smile 5.0 Idle goes up and down help !

Hello Guys,
As everybody knows the weather has been nice around last week in Toronto so I took my girl out of the cold winter garage and I found that my Idle is not steady, it goes rev up and down all the time, any ideas what I should look for ? I guess it is a vacuum but I am not sure, there is too many Vac hoses in the bay.
Please help and thanks for your comments!

IBM
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Old 03-19-2009, 11:30 AM
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saleenpride1986
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If you think it's a vacuum leak you can take carb cleaner and spray it around area's where gaskets are. If the idle changes when you spray in a certain area then there's a leak of some sort. Another thing would be to clean the mass air and make sure the TPS / IAC are in their proper settings.

Do you have any mods or are you completely stock, because having mods can add to changing the idle.
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Old 03-19-2009, 11:43 AM
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ibayter
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As far as I know it is stock, I got her 3 years ago, always store her and when I take her out never had any problems before, this time I put a full gas tank but I did put any stabilizer on her. I just put a full tank and a stp injector cleaner but no diference, still the same. How do I check the TPS / IAC are in their proper settings as you said ?
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Old 03-19-2009, 11:50 AM
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Timspony
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...make sure the MAF is clamped on tight as well...but does sould like a vacuum leak problem...
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