idle at 1200rpm at night when lights on. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-27-2007, 04:40 PM   #1
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Default idle at 1200rpm at night when lights on.

at night when my lights come it my idle jumps from 850 up to 1200-1300, could my alternator be going out, or is the car supposed to do this. it doesnt do it when the lights are on. if i cut the lights on at day it will idle higher also.
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Old 09-27-2007, 05:19 PM   #2
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I know that with my car, the PCM will command a higher idle to maintain a certain battery condition. I don't know if they had that back in '95 or not.
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Old 09-28-2007, 08:30 PM   #3
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ok i wasnt sure if it was supposed to or not. thanks for the info
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