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Thread: Need A/C On In Order For Engine To Sound Right?
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Old 10-01-2007, 06:20 PM   #2 (permalink)
toyomoho
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Might be the IAC valve needs cleaning or has a problem. With A/C on, the engine idle speed is increased to compensate for the A/C compressor load. If the idle is low to start out with, the engine idle up system (A/C on) will increase it to what you think is a normal idle.

Do a TN history search on cleaning the IAC valve as this has come up many times.
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