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.

Irractic idle with A/C on

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Old 05-18-2009, 06:23 PM
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86 5.0L
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Default Irractic idle with A/C on

Hey guys, I had an O/R h-pipe and had terrible idle issues, but would idle fine most of the time with the A/C on! Now I recently installed the original midpipe and the car idles perfectly @ 750rpms without A/C and dies with
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Old 05-18-2009, 09:04 PM
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mjr46
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have you tried a koer test yet??
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Old 05-18-2009, 09:07 PM
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no gonna try it in the morning, funny thing, I just got back from a quick 15min drive and the car idled fine for 10min with the A/C
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Old 05-18-2009, 09:11 PM
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mjr46
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try cleaning the Iac, it may be getting stuck here and there
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Old 05-18-2009, 09:15 PM
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Originally Posted by mjr46
try cleaning the Iac, it may be getting stuck here and there
I've cleaned the thing so many times...

I guess I need a New one, they are pretty pricey for a stupid valve
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Old 05-18-2009, 09:23 PM
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AGREED^^^^^^My 89 needs one and I 'm not looking forward to buying one
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