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.

ROUGH IDLE

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Old Dec 30, 2008 | 05:36 PM
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Question ROUGH IDLE

I post a couple of months ago about my rough idle problem, I have since changed the ACT, TPS,IAC cleaned TB cleaned injectors and my fuel pressure is 30 PSI does anyone have any suggestions???? and also cleaned the MAF
Old Dec 30, 2008 | 05:56 PM
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check for vaccum leaks and make sure all cylinders have proper compression
Old Dec 30, 2008 | 06:06 PM
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no vac leaks but I havent checked the compression wat should the compression be?
Old Dec 30, 2008 | 06:17 PM
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If there is an egr valve on the car make sure it's working correctly and not sticking open. There should be no vacuum going to it at idle. The f/p should be set around 39psi.
Old Dec 30, 2008 | 06:25 PM
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yes that works correctly, and I was told when car is running it should be 30, and when koeo it should be 35-45psi
Old Dec 30, 2008 | 06:34 PM
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30psi is too low while running at idle. How does the car run otherwise under cruise and load conditions?
Old Dec 30, 2008 | 06:39 PM
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It runs good when driving or hitting the throttle its just the idle thats jacked up it is really irritating the **** out of me
Old Dec 30, 2008 | 09:12 PM
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OK, so has it always been like this?
Have you changed something and then it started?
What's your mod list?
Old Dec 30, 2008 | 10:11 PM
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Are you sure you dont have a nasty cam? LOL J/K
Old Dec 30, 2008 | 10:16 PM
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Originally Posted by TexasHotrod
no vac leaks but I havent checked the compression wat should the compression be?
how did you check for vacuum leaks?



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