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Old 04-28-2013   #1
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Join Date: Apr 2013
Location: Michigan
Posts: 31

low idle better??

im having problems with idling on my 5.7 TPI its below 500 and kinda on the rough side. i have checked TPS voltage, its reading .67, i ohm tested the injectors all were between 16-17 ohms, i replaced the IAC, and ran fuel injector cleaner through. only things i didnt do was replace fuel filter, and check fuel pressure. i did however get it to idle better by hooking multimeter to TPS and turning idle stop screw until TPS voltage increased by .1, then i set the TPS to .70, the car idles at about 1000 in park and 500 in drive. it seems to run smoother as well. i did put TPS to factory .54 and she did not want to run well at all. with the TPS at .70 would that cause her to run rich?
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Old 04-28-2013   #2
1989 Gunmetal Grey, 350 TPI, 700R4, 3:27 BW
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Join Date: Sep 2005
Location: Virginia
Posts: 525

GTA Year: 1989
GTA Engine: 350 TPI Automatic
Re: low idle better??

Remove your IAC solenoid located on the passenger side of your throttle body and give it a good cleaning with carb cleaner. Inside your throttle body cavity the IAC screws into as well. There is a measurement between the end of the poppet and the hex flange that can be checked, but I don't remember off hand what that is. Maybe another member has that info.
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