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.

high idle after warm up.

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Old 11-26-2007, 09:35 AM
  #1  
mobileaudio219
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Default high idle after warm up.

my car idles great when it cold, but after it warms up to around 200 degree's it jumps the idle up to around 2,500 rpm. If you unplug the IAC and adjust the stop screw in the thottle body it fixes the problem.

So does this indicate that the IAC is bad?

Somebody reccomended I check the timing. I know I bumped it up a little, I think I set it at 14 degrees but cant remember, should I set it back down to 10 degree's?
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Old 11-26-2007, 09:39 AM
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r.barn
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Default RE: high idle after warm up.

replace the IAC for $30 and start there.
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Old 11-26-2007, 09:42 AM
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mobileaudio219
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Default RE: high idle after warm up.

alright, guess I'll do that... thanks.
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