2004 GT rough idle (with videos and sound) - Mustang Evolution

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Old 11-01-2013, 12:54 PM   #1
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2004 GT rough idle (with videos and sound)

Okay so pretty much, 04 GT, manual 98,200 miles and the idle fluctuates between the highest- 1200 and the lowest- 500. When at idle the car makes a weird growling/gargling sound, link to the videos so you can listen. along with a hissing sound, which you can also hear in the video, I'm leaning more towards vacuum leak for the hissing but the rough idle and growl has me stumped.

So far I've cleaned the IAC, and everything from the air filter to the throttle body has had a good once over. I've tried the whole carb cleaner and still haven't found the leak. But at this point I'll try anything! the videos hopefully will help you guys any other questions just let me know. But the hissing sound is definitely coming from somewhere around the intake/throttle body

I STRONGLY RECONMMEND USING HEADPHONES WHEN WATCHING THE VIDEOS, IT EXPOSES THE SOUNDS A WHOLE LOT BETTER THAN SPEAKERS WOULD.

Thanks guys!

Around the exhaust


Under the hood
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Old 11-01-2013, 09:52 PM   #2
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My guess would be the iac still. Sometimes cleaning them doesn't work. If you have any friends with a gt see if you can try their iac and see what it does.
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Old 11-01-2013, 10:04 PM   #3
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Originally Posted by Mfore33 View Post
My guess would be the iac still. Sometimes cleaning them doesn't work. If you have any friends with a gt see if you can try their iac and see what it does.
Yeah that's what I kinda figured unfortunately. I did the whole cigar smoke thing today to find and vacuum leaks and I got nothing so by process of elimination it's the $100 valve -.-. Thanks for the reply!
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Old 11-02-2013, 12:11 PM   #4
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You can get one for 35$ on rockauto.com
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Old 11-02-2013, 12:39 PM   #5
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Yeah I looked there first cause I know it's always the cheapest and these are my results

The motorcraft one is the first one that fits my car (I have that air port protruding out of it )
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