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PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

idle hangs at 1500 until I come to a complete stop

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Old Mar 24, 2005 | 12:17 PM
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Default idle hangs at 1500 until I come to a complete stop
what tables should I be looking into to stop this.
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Old Mar 25, 2005 | 02:31 PM
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Originally Posted by Blackbird
what tables should I be looking into to stop this.
What are your mods? Have you just installed a cam?

Bill
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Old Mar 25, 2005 | 03:58 PM
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This is the throttle follower, possibly enhanced by a
vacuum leak / drilled TB / etc. base airflow offset.
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Old Mar 25, 2005 | 09:01 PM
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Originally Posted by Blackbird
what tables should I be looking into to stop this.
Try this. Go to Edit, Engine, Idle, Idle Airflow, (Throttle Cracker) Airflow vs RPM vs MPH. Zero out table up to 64 mph and 2800 rpm.
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Old Mar 26, 2005 | 02:55 PM
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Originally Posted by Larry
Try this. Go to Edit, Engine, Idle, Idle Airflow, (Throttle Cracker) Airflow vs RPM vs MPH. Zero out table up to 64 mph and 2800 rpm.
I agree. Usually when the idle hangs forever until you come to a complete stop it's throttle cracker. When the idle eventually comes down it's throttle follower.
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Old Mar 26, 2005 | 03:57 PM
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Originally Posted by Larry
Try this. Go to Edit, Engine, Idle, Idle Airflow, (Throttle Cracker) Airflow vs RPM vs MPH. Zero out table up to 64 mph and 2800 rpm.
When you make this change does the PCM have to go thru a relearn? How long do you need before seeing any change?

Bill
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Old Mar 26, 2005 | 05:51 PM
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No relearn necessary.
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Old Mar 26, 2005 | 06:16 PM
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easy way is to turn the ign on --take the plug off the maf and tps sensor --shut off the ign then plug it all back in --it works on my car anyways
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Old Mar 26, 2005 | 10:17 PM
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if your running a KnN then you might want to clean off the oil from the maf and TB. I had that problem. Ran fine after that.
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Old Mar 27, 2005 | 10:16 AM
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excellent. I will give these things a try soon and let you know.
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Old Apr 6, 2005 | 01:43 PM
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Try this. Go to Edit, Engine, Idle, Idle Airflow, (Throttle Cracker) Airflow vs RPM vs MPH. Zero out table up to 64 mph and 2800 rpm
tried this. zero difference.

any other ideas?
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