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  #1  
Old 07-08-2013, 04:35 PM
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Trober Trober is offline
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Default Idling problems..

I have a 99 ram 1500 with the 5.9 and I can start it and if I keep my foot on the gas it runs fine but when I let off it either dies or if I touch the throttle it may stay running a little bit and die or it just does. I'm thinking its either the IAC or the TPS! Just needing other opinions.
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Old 07-08-2013, 08:42 PM
Jollux Jollux is offline
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You could try to replace either or both, nice thing about Auto Zone is if what you replace is not the problem you can always install the old and take it back. Love this method as long as it wasnt damaged they will let you return it. Both are easy to get too and easy to rule out.
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Old 07-08-2013, 10:19 PM
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you could try cleaning your old IAC first. cleaning your old IAC is pretty much free and usually does the job.
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Old 07-11-2013, 12:44 PM
DanTheMan DanTheMan is offline
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Try looking at your O2 sensors. I just went through a whole mess trying to figure out my idling issues, and it ended up being a bad upstream O2.
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Old 07-11-2013, 02:57 PM
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Quote:
Originally Posted by DanTheMan View Post
Try looking at your O2 sensors. I just went through a whole mess trying to figure out my idling issues, and it ended up being a bad upstream O2.
^and he got reps for that^

It is usually the IAC or the upstream 02 sensor. I've cleaned dozens of IAC's and it's never helped one of 'em. At right around $45 you could call it preventative maintenance if it doesn't straighten it out.

As stated above, the next usual culprit is an 02 sensor. You can try unplugging it to see if the idle straightens out. If so, replace it.

(EDIT) sometimes it's difficult to tell which one it is because they'll both have a tendency to sound like a big vacuum leak near the intake. Try unplugging the IAC also, if it gets worse that should be the problem. But usually if you can't keep it running it's the IAC. Running, but poorly and an occasional CEL is indicative of the 02 sensor.

Last edited by Warlock III; 07-11-2013 at 03:01 PM.
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Old 07-11-2013, 07:44 PM
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if the IAC is dirty enough the whole throttle body may need to be cleaned.
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