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High idle when clutch pedal is released

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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 when clutch pedal is released

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Old 08-17-2012, 01:46 PM
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offthewall158
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Default High idle when clutch pedal is released

I just got my 1990 gt running good now my only problem is that it idles high when the clutch pedal is released. (1500-2000rpms) when the clutch is engaged whether the trans is in gear or in neutral it idles perfect right around 800-1000 rpms with minimal surging. i rebuilt the motor last summer with a set of gt40 heads and intake, b303 cam and mac longtube headers. ive worked out all the bugs (i think) except for this one. and i have never heard of this problem before. any ideas?

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Old 08-17-2012, 02:35 PM
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mattdel
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Hard to say. Good place to start would be vacuum leaks, but I'm thinking this might be related to the neutral switch, I just need to find out what year the ECM programming included an idle bump for shifts.
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Old 08-17-2012, 02:39 PM
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im 99% sure there arent any vacuum leaks. as for the neutral switch, is that located behind the clutch pedal?
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Old 08-17-2012, 03:00 PM
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Nope, the clutch switch on the pedal is to prevent starting in gear. The neutral switch is on the trans, up near the shifter. Should be a 2 prong.
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Old 08-17-2012, 10:26 PM
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Had same problem when I did some mods. I had a clogged IAC and an exhaust leak. Not sure which exactly was the issue.
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Old 08-18-2012, 11:55 AM
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Originally Posted by Dj_Seph View Post
Had same problem when I did some mods. I had a clogged IAC and an exhaust leak. Not sure which exactly was the issue.
i do have an exhaust leak that i just havent gotten around to fixing, but im pretty sure i cleaned my IAC motor before putting it on.
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Old 08-24-2012, 09:16 PM
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unplugged the neutral switch on top of the tans and fixed my problem. purrs like a kitten
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