4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

IAC or What?

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Old Jan 6, 2018 | 09:30 AM
  #1  
Rogerdoger45's Avatar
Rogerdoger45
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Joined: Oct 2015
Posts: 10
From: Florida
Angry IAC or What?

Hi all I am having an issue with my car so let me try to explain this. I was having issues when slowing down at a light the car would turn off at times before coming to a full stop, also was having RPM fluctuating. I change the IAC on the car and now when I first start the car in the morning it runs like it has big cams the RPM fluctuates but not as much as before I change IAC. Now when I come to a stop the RPM stay revving high for a few sec then goes to normal RPM she also burning learn now where she use to burn rich because of no 02 sensor. I also notice that my theft light stay on when car is off I have to turn the car on the on position for 10 min to reset. I check as best as i could for vacuum leaks and could not find any. Does anyone have a solution for this mess Thanks!
Old Aug 14, 2018 | 01:02 PM
  #2  
jriner1994@gmail.com's Avatar
jriner1994@gmail.com
 
Joined: Aug 2018
Posts: 23
From: Georgia
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Originally Posted by Rogerdoger45
Hi all I am having an issue with my car so let me try to explain this. I was having issues when slowing down at a light the car would turn off at times before coming to a full stop, also was having RPM fluctuating. I change the IAC on the car and now when I first start the car in the morning it runs like it has big cams the RPM fluctuates but not as much as before I change IAC. Now when I come to a stop the RPM stay revving high for a few sec then goes to normal RPM she also burning learn now where she use to burn rich because of no 02 sensor. I also notice that my theft light stay on when car is off I have to turn the car on the on position for 10 min to reset. I check as best as i could for vacuum leaks and could not find any. Does anyone have a solution for this mess Thanks!

Did your car only stall if ac was on? That's what mine is doing. Did you have to do any resets after replacing IAC? But I've heard with the theft light if you turn the the steering wheel both ways then turn key it'll start up
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