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Old 07-31-2014, 06:53 PM   #1
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Idle problem!

Hey guys! I have a few questions about my car when you have a few minutes to answer..

I just bought an 03 gt convertible, centennial edition, manual, so just a heads up.

I have an idle problem. My rpms will stick exactly at 2000 for a few seconds, and then drop low enough to stall out right after. It only happens whenever i jump on the throttle and keep it above 3000 rpms for a while. I'm assuming it's an iac problem, but i figured I'd ask for advice.

My cars is a centennial edition. Whats different with that besides badges, 2 tone seats and stamped seats? I would like to modify it like my 96 gt but i don't want the value to drop if a centennial is "valuable". No one but little kids can fit in the back seats so i was going to take them out and replace them with a clean stereo system like my '96 as well as put my corbeau seats in. I take all information i can about it!

My front right tire is leaking air. I was told it was coming from the valve stem. Any way i can check? I have to fill it up every couple days..

Thanks!!
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Old 07-31-2014, 07:14 PM   #2
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Congrats on the car!

Yes, it probably is a faulty IAC causing the erratic idle.
The anniversary editions are no more valuable than any other GT. It is just a way for Ford to pat themselves on the back for keeping the Mustang in production for all of those years.
Spray some soapy water on the tire and you will see bubbles appear wherever there is a leak.
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Old 07-31-2014, 07:51 PM   #3
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Thanks man. I'll do all that and i was thinking it was the iac. I didnt want to spend money guessing, but now I'm pretty positive. Thanks!
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Old 07-31-2014, 08:00 PM   #4
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Don't buy the IAC from AutoZone... There have been a lot of recent threads about them not functioning correctly right out of the box. Use only a Motorcraft or one manufactured by Hitachi. Rockauto has some decent prices on them.
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Old 08-01-2014, 01:39 PM   #5
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I'm getting a Motorcraft iac forsure. I've been going to Napa for all my stuff and they've been helpful, so I'll give this one a try. Thanks again!
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Old 08-01-2014, 06:47 PM   #6
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Definitely not from AutoZone haha. I bought 2 iacs and both hung up at 2 grand and both were from AutoZone. Ford oem is your best bet

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Old 08-02-2014, 09:59 AM   #7
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I have a 2003 Centennial Edition as well. Here is some information about the cars:

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Old 08-03-2014, 03:02 PM   #8
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That link isn't working man. But hey, my IAC wasn't the issue. It continues to idle high and stall out when i jump on the throttle. I'll get a video when i can get around to it. Slightly difficult when it's a manual. Lol any other ideas? I replaced the iac with another Motorcraft one and the idle doesn't hang like before when I'm just cruising, but the it still has the other problem. Thanks in advance!
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Old 08-03-2014, 03:13 PM   #9
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Did you disconnect the battery for 15 minutes to clear the computers memory and allow it to learn the new idle trim?
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Old 08-03-2014, 03:38 PM   #10
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.... I'm a noob. I'll let you know later if that solves it. I should have remembered that.
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Old 08-03-2014, 08:19 PM   #11
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Ok, well that didnt work. It helped a bit with idling, but it still stalls out after hanging on 2000 rpm for a few seconds. It doesn't happen as often though!
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Old 08-03-2014, 08:40 PM   #12
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Hmmm.
Sorry that didn't work.

Start looking for a vacuum leak then. Particularly around the intake manifold but check everywhere. WD40 works good for this, just spray it everywhere that a vacuum leak could occur, with the engine running, and listen for any change in the idle. When you hear the idle change, you've found the leak.
Also, since this car is new to you, check all of the tune-up items and clean the Mass Airflow Sensor and the Throttle Body, change the fuel filter and check the air filter.
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