stalling at idle?

2003 FORD MUSTANG
168,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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BRANDONDAONE
  • MEMBER
  • 1 POST
Hello, i recently replaced the idle air control valve and changed a hose but when i tried to start back up it stalled out immediately and or idles very low at 500. i am wondering what my next course of action would be. i replaced it with the Duralast IAC and at the time of this i took the negative battery terminal overnight to reset the ECM.
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Jan 7, 2025 at 8:08 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Hi,

Was the original IAC doing the same thing? Are you sure there are no engine vacuum leaks around where you were working?

Check to see if there are leaks. I have a feeling that is part of the issue.

Here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, I would remove the IAC again and inspect where it connects to the vehicle, Check if there is any carbon build up or anything that could block the air flow.

Let me know what you find.

Joe
Jan 8, 2025 at 7:29 PM
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