C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Oct 16, 2009 | 03:17 PM
  #1  
wire1967's Avatar
wire1967
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Default Idle

I have had a problem with my idle going up and down. I switched out the tps and put the new one in and if i mount it in the factory holes the idle goes up to 850 if i pull the top screw out and change the angle of the sensor to about 32 the idle is perfect 725. I have the idle screw backed out all the way on the side of the plenum. Any help would be appreciated.

thanks
Larry
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Old Oct 16, 2009 | 04:05 PM
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The TPS should be adusted to produce about .52 volts at idle. You can do an idle setting search for more details.
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Old Oct 17, 2009 | 08:35 AM
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Your TPS is non adjustable, the ECM will recalibrate it's TPS idle voltage, next time you start it up. That being said, you have to re-set the min idle, since you messed with the screw.
Engine at operating temp
Jump terminals "A" and "B" on the ALDL connector
Turn on ignition and wait 30 seconds
Unplug IAC connector
Unplug EST connector
Remove jumper and start engine
Adjust min idle screw to obtain around 450 rpm
Turn of motor
Re-connect IAC and EST
Remove ECM power wire or disconnect neg terminal on battery, for 30 seconds.
Done
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Old Oct 18, 2009 | 02:30 PM
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Will try that and let you know
thanks
Larry
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Old Oct 19, 2009 | 01:14 PM
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Set idle to 15-20 IAC counts but make sure the timing is spot on.
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