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idle non consistant idle non consistant
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Old 10-15-2008, 10:12 am   #1
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CM idle non consistant
on my 2000 C5 with the a/c on or off sometimes the idle drops down to almost stall then picks up. It is an auto and in drive when it does it. It does not do it consistanly. Any suggestions???
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Old 10-15-2008, 10:20 am   #2
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HI there,
Depending on how long its been since it was cleaned, the throttle body may be in need of cleaning.
It would be suggested to start there.
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Old 10-15-2008, 10:36 am   #3
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i just paid the dealer to to the decabonazation about 2 weeks ago and it is still doing it.
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Old 10-15-2008, 10:53 am   #4
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Hm, well then, a minimum air rate check and a data scan would be the next course of action.
This is to check to make sure that the MAF sensor is reading about 6-7 grams per second and that the fuel trims are about +/- 5%
Another question was did the battery go dead recently?? If so, you may have to do an idle relearn.
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Old 10-15-2008, 10:57 am   #5
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How do I do an idle relearn?
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Old 10-15-2008, 11:11 am   #6
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HI there,
AUTOMATIC TRANSIMSSION

Turn OFF the ignition.
Restore the PCM battery feed.
Turn OFF the A/C controls.
Set the parking brake and block the drive wheels.
Start the engine.
Ensure that the engine coolant temperature is more than 80°C (176°F).
Shift the transmission into Drive.
Allow the engine to idle for 5 minutes.
Shift the transmission into Park.
Allow the engine to idle for 5 minutes.
Turn OFF the engine for 30 seconds.

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Old 10-15-2008, 11:19 am   #7
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Restore the PCM battery feed. When you say this is that the battery cable im supposed to disconnect??
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Old 10-15-2008, 11:50 am   #8
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Disconnect the negative battery cable for 2 mins. Then reconnect and torque to 11 ft lbs.
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Old 10-15-2008, 04:00 pm   #9
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i was under the impression that you just had to drive the car 10 or so miles after disconnecting the battery. good post.
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