Rough idle before throttle body cleaning, worse after - Mustang Evolution

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Old 09-10-2013, 01:00 PM   #1
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Question Rough idle before throttle body cleaning, worse after

Today i took my 2003 v6 mustang to the shop to try and figure out what was causing my stang to idle rough occasionally when i would come to a stop, i was told by the shop that my throttle body was very gunked up and needed to be cleaned, so they did, and cleaned the IAC, shortly after leaving i came to a stop at a stop light and the RPM's dropped even further than before, and if left in drive at a light long enough will continue to drop and recover over a minute or two. is this a vacuum leak, or does the ECM need to be reset? Also, very new mustang owner, still trying to learn.
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Old 09-10-2013, 03:13 PM   #2
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Originally Posted by 11CharlesB View Post
Today i took my 2003 v6 mustang to the shop to try and figure out what was causing my stang to idle rough occasionally when i would come to a stop, i was told by the shop that my throttle body was very gunked up and needed to be cleaned, so they did, and cleaned the IAC, shortly after leaving i came to a stop at a stop light and the RPM's dropped even further than before, and if left in drive at a light long enough will continue to drop and recover over a minute or two. is this a vacuum leak, or does the ECM need to be reset? Also, very new mustang owner, still trying to learn.
try cleaning your MAF
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Old 09-10-2013, 03:59 PM   #3
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cleaned it shortly after coming home from the shop, did nothing.
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Old 09-10-2013, 04:05 PM   #4
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also should ad that the car has a SR CAI ( previous owner put it in) and dual slp loud mouth exhaust system (also by the previous owner)
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Old 09-10-2013, 04:13 PM   #5
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make sure the CAI is installed properly i had same problem but it was just slightly off
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Old 09-10-2013, 04:15 PM   #6
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Sometimes the answer is in the comp. Autozone will test it for free
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Old 09-10-2013, 05:05 PM   #7
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what was off about your CAI?
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Old 09-10-2013, 07:21 PM   #8
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No codes could be pulled from the computer, CAI is hooked up properly as far as i can tell, maybe a reset is in order.
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