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

fast idle

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Old Mar 18, 2006 | 11:15 PM
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From: Mountain Home AR
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86-79K-4+3. When I start it cold it fires right up and idles up to around 1000. Staying at 1000 for about 30 seconds it goes down to 600 and back up again. It will do this up and down for about 2 min, than idle down to 600 and stay there. After warm-up, evertime I start it back up, it goes to 1000 and stays there for around 30 seconds, then goes back down to 600 and and runs fine. Whats up??? Dave
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Old Mar 18, 2006 | 11:20 PM
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read my website's link about TPS and IAC checkup and perform that, if its never been done then it needs to be
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Old Mar 18, 2006 | 11:29 PM
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Old Mar 18, 2006 | 11:29 PM
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Default fast idle

Originally Posted by vader86
read my website's link about TPS and IAC checkup and perform that, if its never been done then it needs to be
Thanks again Vader. I've been to your site many times. Looks like Im going back.
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Old Mar 20, 2006 | 11:47 AM
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Are you getting any trouble codes? Could be a vacuum leak. If your EGR valve gets stuck open, it can cause this problem, too.
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