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2005-2010 Mustang GT Tech Forum

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Unread 09-21-2011   #1 (permalink)
MrGhostlore is offline Rookie


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Default 2006 GT Idle Problems

So I am having problems with my idle...

I have a 2006 GT, with a Bama Tune, JLT CAI, and MAC Axle Back Mufflers.

The problem I am having is that when I push in the clutch and just coasting my idle will surge between 250-750rpms, almost feeling like it is going to die. However, once I get to a stop it settles at 750-1000rpm and will idle all day long.

Also, when I am driving it everything runs fine. She seems just as peppy as normal, great accelerations. Everything...

I just got a new set of tunes from Bama to see if that was the problem and it seemed to be fine when I first uploaded them, but it is back to normal.

Now it has been doing this for about 2-3 years, however just doing the light surge from 500-750 never really feeling like it was going to die or going down to like 250rpms.

Any suggestions?
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Unread 09-21-2011   #2 (permalink)
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There should be a low idle stop screw on the throttle body. It sounds like it's set too low.
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Unread 09-22-2011   #3 (permalink)
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Idle air is set by the tune on a 4.6 & can be adjusted with your hand-held tuner. Don't try to adjust your throttle body. If since it's been doing this for a while as you indicate, try cleaning the throttle body, especially where the throttle shaft goes through the casting. I also had Bama tunes and after loading a new one, throttle response was awesome but then would seem to degrade and not be as responsive as at first. I have no idea what caused this but for me, it was only a driveability issue, not power. The engine made very good mid to upper RPM power with Bama tunes, but they made daily driving in the lower RPM ranges more of a chore.
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Unread 09-22-2011   #4 (permalink)
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Assuming that all necessary cables are pluged in and you have no vacuum leak nor a dirty MAF:

1. Clean the the inside of the throttlebody with carb or throttlebody cleaner.
2. If that doesn't help replace your throttle body with a known good one or new one

I had to replace mine - cleaning didn't help.
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Unread 09-22-2011   #5 (permalink)
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Is there a gasket that will need to be replaced if I take the throttle body off, or is it a reusable o-ring style?

Thanks for all the info. I will try cleaning the TB.
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Unread 09-22-2011   #6 (permalink)
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Update - I took my Throttle Body off and cleaned it really well. It didn't seem that dirty, except there was clear black build up on the edges near where the butterfly's are. To my surprise it has fixed the surging. It stays around 750rpms right now. It's crazy that it was just that, plus I did put a brand new K&N filter on the end of my JLT...but thanks so much for all the info =)
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