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

fast idling

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Old Dec 1, 2010 | 07:30 AM
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Default fast idling

I have a 1995 LT1 automatic that have always had a fast idling problem can someone give me some hints as to a fix for this problem. JB,Sr.
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Old Dec 1, 2010 | 07:46 AM
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Check the butterfly flap in your throttle body and make sure it's clean of carbon buildup. The TPS ( throttle position sensor)on the right side of the throttle body picks up info and sends it to the computer. You can check reference voltage at the plug with a pigtail adapter and good meter. And last the IAC ( idle air control) that's on the bottom of the throttle body has a pintle that opens and closes that can get carbon build up and not work right. It opens up at idle to let air in when the butterfly is closed in the throttle body.
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Old Dec 1, 2010 | 10:50 AM
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If it comes and goes, the TB may be just worn out. The hole the shaft rides in gets sloppy. Check for a vacuum leak also.
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Old Dec 1, 2010 | 11:00 AM
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Also check for a sticking throttle cable.
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Old Dec 8, 2010 | 11:25 AM
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Ttt
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Old Dec 8, 2010 | 11:46 AM
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........... Vacuum leaks ?? ..... Have you set minimum idle ?? ........
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Old Dec 8, 2010 | 12:06 PM
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IAC needs to be taken out and cleaned. Do not twist the plunger. Just use some high quality sensor cleaner, and soak the living crap out of it. Then let it dry. Then put it back in.
If it fixes it,which it probably will, then go by a DENSO or AC DELCO. That way you get another one to last 15 years.
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Old Dec 9, 2010 | 07:41 AM
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what is the IAC?
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Old Dec 9, 2010 | 07:42 AM
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how do you set the min idle? Did change the throttle position sensor.
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Old Dec 9, 2010 | 10:56 AM
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Originally Posted by joebuckSR
what is the IAC?
Idle Air Control. On the passenger side of the engine is where it is located on bottom of throttle body.
They get dirty over time with carbon build up and they can go bad electrically.
http://shbox.com/1/iac2.jpg
and reset
http://shbox.com/1/4th_gen_tech2.html#iac_reset
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