2006 Mustang GT AC On Rough Idle - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 03-18-2010 Thread Starter
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2006 Mustang GT AC On Rough Idle

Hi,

I have an 2006 Mustang GT that currently has idle problems. Here's a breakdown of possibly relevant events.

In Summer 2009, the car had low refrigerant. Symptoms: Compressor clicking on and off every 2 seconds, AC not cold. Solution: Recharged with ~16 oz of R134A. Everything went to normal... compressor operated normally and AC was cold again.

In Jan 2010, the car's check engine light went on and was throwing a P0340 code - camshaft position sensor. I had it cleared without changing anything and it came back in 2 days. I then cleared it again and changed the alternator as many people have done and it hasn't come back.

Currently, I noticed the AC was starting to get warmer but it still blew cool air. I also noticed when the AC was on max, the engine idle speed would vary 200-300 rpm or so about every 2 seconds while the compressor was on. I just recharged it with ~16 oz of R134A with additives and the AC is now blowing cold air but I still get the fluctuation in the engine idle only while the AC is on. If I turn off the AC, everything is normal. The compressor is not clicking on and off this time, it seems to stay on, unlike last summer.

I'm not sure what's going on... please help!

Thank you!

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post #2 of 11 (permalink) Old 03-18-2010
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When was the last time you cleaned your throttle body?


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post #3 of 11 (permalink) Old 03-18-2010 Thread Starter
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Quote:
Originally Posted by stlwagon View Post
When was the last time you cleaned your throttle body?
Never

I did notice it being a bit dirty when I changed the alternator and had to remove the cover... but will a dirty throttle body affect idle ONLY when the AC is on?

Thank you!
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post #4 of 11 (permalink) Old 03-18-2010
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+1 on the cleaning.


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post #5 of 11 (permalink) Old 03-18-2010
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How do you clean the throttle body?

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post #6 of 11 (permalink) Old 03-18-2010
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Quote:
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How do you clean the throttle body?
The best way is to remove it and spary it with TB cleaner. Then reinstall it.


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post #7 of 11 (permalink) Old 03-18-2010
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MAF, TB, and make sure to change your fuel and air filters. they are commonly overlooked. even if its unrelated, still a good idea to do

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post #8 of 11 (permalink) Old 03-19-2010
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I had the same issue with my 2006 GT. Turnied out the compressor puked it's guts through the whole system and was locking up whenever it would cycle on. Ended up replacing the compressor, condensor, orific tube, and a few other things. Car had 17,500 miles on it, but was 42 months old. NO WARRANTY!
I called Ford, no help their either. But mine would die at a stop light when the compressor kicked on. Hopefully you aren't developing the same issue.
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post #9 of 11 (permalink) Old 03-19-2010
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Quote:
Originally Posted by NarfZot View Post
Never

I did notice it being a bit dirty when I changed the alternator and had to remove the cover... but will a dirty throttle body affect idle ONLY when the AC is on?

Thank you!
It's amazing how much a dirty TB can affect these cars idle.

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post #10 of 11 (permalink) Old 03-23-2010 Thread Starter
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Here's an update...

I cleaned both the MAF and throttle body using CRC cleaners, without resetting the computer. It fixed the rough idle but then started idling really high when in neutral/park (~1000 RPM) and when I lifted off the gas when cruising (auto trans).

I then reset the computer by removing the neg term of the battery and now all is well. The car is now running perfectly.

Thanks for your help guys!
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Quote:
Originally Posted by NarfZot View Post
Here's an update...

I cleaned both the MAF and throttle body using CRC cleaners, without resetting the computer. It fixed the rough idle but then started idling really high when in neutral/park (~1000 RPM) and when I lifted off the gas when cruising (auto trans).

I then reset the computer by removing the neg term of the battery and now all is well. The car is now running perfectly.

Thanks for your help guys!
Congrats, when you reset the PCM, you reset the adaptive learning so it relearns your driving style.


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