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Rough Idle with Heat on

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Old 05 Dec 2005, 10:44 am
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Location: Greenwich, CT.
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Default Rough Idle with Heat on

I live in CT and it has been very cold, like 25 degrees this morning, and i have noticed in the morning when i go out and start the car up and turn the Heat/ Defroster on it doesn't idle smoothly, like it will go from 800RPMs to 1,100RPMs, it sounds like someone is pressing the gas repeatedly, i can hear it when i go inside. Has anyone had this problem or know how to fix it?
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Old 05 Dec 2005, 11:01 am
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I believe that's normal. When you put defrost on, it automatically turns on the A/C. The A/C, plus cold temp, tell computer to keep engine idle high. Leave the fan on 0 until it warms up a bit.
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Old 05 Dec 2005, 11:14 am
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QSD hit the nail on the head! Also when you turn on the Rear Window Defroster/Heated Mirrors and Heated Seats (if equipped), you load up the charging system and that can cause some roughness at idle.
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