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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.

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Old 03-04-2009, 06:56 PM   #1
jakers204
 
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Default Idling problem

Hey guys, looking for some suggestions. My 94 mustang GT runs good sometimes, but other days it has an idling problem. Iíll be sitting at a light and the RPMs will go between 500-1000. And the battery meter also jumps back and forth. Took it to the shop got a new alternator, but still got the problem. Tested the battery and its fine, and a new alternator. Any suggestions? Thanks.
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Old 03-04-2009, 09:43 PM   #2
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any codes?
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Old 03-05-2009, 12:07 AM   #3
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any codes?
No check engine light so not sure if I can get a code without that on?

Thanks
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Old 03-17-2009, 12:47 AM   #4
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any codes?
Took it to the shop, and no codes. Think im going to pull out my system and see if it continues. Even though I have the radio off, maybe it has something to do with it, considering the shop cant figure it out!
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Old 03-17-2009, 02:57 AM   #5
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How do the battery terminals look? Gunk build up on those can contribute to that. Also I would try changing your idle air control or cleaning it. What does your car have as far as mods? Longtubes on 94-95 5.0s can cause that as well, cause our computers are a bitch.
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Old 03-17-2009, 10:11 PM   #6
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How do the battery terminals look? Gunk build up on those can contribute to that. Also I would try changing your idle air control or cleaning it. What does your car have as far as mods? Longtubes on 94-95 5.0s can cause that as well, cause our computers are a bitch.
Thaks, I got finals this week so should have time to checkout the battery terminals and probably just clean the idle air control next week and let you know how it works. Thanks
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Old 03-18-2009, 07:01 PM   #7
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my 89' has the same problem. i just cleaned the **** out of my terminals, and replaced the (wow brain fart can't think of the word) positive and negative hookups i guess it'd be called? lol. I have long tubes as well, but its not a 94-95 computer... and isn't there some special way to clean the IAC? and where is the IAC sensor? thanks
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Old 03-18-2009, 07:11 PM   #8
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my 89' has the same problem. i just cleaned the **** out of my terminals, and replaced the (wow brain fart can't think of the word) positive and negative hookups i guess it'd be called? lol. I have long tubes as well, but its not a 94-95 computer... and isn't there some special way to clean the IAC? and where is the IAC sensor? thanks
Hate to link to another forum, but there is some good instructions on solving idle problems, including cleaning the IAC.

http://www.muscularmustangs.com/maintain.php
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Old 03-19-2009, 12:53 AM   #9
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alright cool man thanks. no problem linkin to another forum lol
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Old 03-25-2009, 10:26 PM   #10
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alright cool man thanks. no problem linkin to another forum lol
Well, got so frustrated I took it to the shop. They cleaned the Mass air flow sensor, and throttle body. Which I already did, but I didnt have a security torx bit 20 used to remove the sensor. So needless to say my cleaning job wasnt as good as theirs. $50 later learned my lesson, but cant complain, car runs like a champ now. As the instructions on cleaning the MAF say, using a oil based filter causes the filter to get dirty.

Good luck man.
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Old 03-25-2009, 10:26 PM
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