87 Mustang has very high idle and running VERY rich. Any ideas? - Mustang Evolution

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Old 06-19-2010, 01:37 PM   #1
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87 Mustang has very high idle and running VERY rich. Any ideas?

Hi I have a 1987 Mustang GT Convertible 5.0 High Output and I have a Problem. When my car is in idel it is very high and the car is running real rich. I just replaced my valve covers and my upper intake gasket cover and I fixed the vacum lines that were leaking. I'm not sure why my car is running so high in idel and is running rich, It smells like gas as soon as i turn it on and if i put my foot in the pedal black smoke shoots out. Any suggestions on how to fix this? thanks a bunch!
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Old 06-24-2010, 11:55 PM   #2
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Re: 87 Mustang has very high idle and running VERY rich. Any ideas?

id look at the fuel pressure regulator first cause its easy.
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Old 06-25-2010, 12:54 AM   #3
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Re: 87 Mustang has very high idle and running VERY rich. Any ideas?

how do i check that? lol
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Old 06-25-2010, 06:36 PM   #4
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Re: 87 Mustang has very high idle and running VERY rich. Any ideas?

pull the vacuum line off of it. see if there is any indication of fuel there.
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Old 07-17-2010, 11:04 PM   #5
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Re: 87 Mustang has very high idle and running VERY rich. Any ideas?

Sounds like you still have a vac leak somewhere. For idle reset unplug the IAC set the idle screw to where you want it and then plug the IAC back up. Also clean you maf meter with some Electronics cleaner.
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Old 08-21-2010, 12:25 PM   #6
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Re: 87 Mustang has very high idle and running VERY rich. Any ideas?

timing is up too high?
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