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Old 06-05-2007, 10:43 AM   #1
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Join Date: May 2006
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Location: Decatur, TX
What I Drive: 2002 ZTS Focus

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Rough Idle with AC on

2002 Focus, Auto Tranny

I had the alternator replaced last week. Now I get a very rough idle (stumble) with the AC on when stopping at traffic lights. Tach seems to bounce between 700 and 100 until I turn off the AC. Idle returns to normal once AC is off.

If I turn on the AC while stopped this does not happen. Only happens when slowing down.

Is there a sensor or electrical connection that controls the idle that may have been affected by the partial car disassembly involved with an alternator replacement?

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