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

High idle

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Old Aug 22, 2016 | 08:35 PM
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Default High idle

Driving the car tonight and went to pass a car so I had to step on it. Once I let off the gas the idle will not go down. I put it in park and its idling at 3 grand. While in gear it's idling at 2 grand. Anyone know why? How can I fix this?

Thanks.
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Old Aug 22, 2016 | 08:42 PM
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Sticky throttle body or cable clean and lube. Maybe a vacumm line. Or even your floor mat stuck on the pedal.

Last edited by antfarmer2; Aug 22, 2016 at 08:44 PM.
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Old Aug 22, 2016 | 10:12 PM
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Originally Posted by antfarmer2
Sticky throttle body or cable clean and lube. Maybe a vacumm line. Or even your floor mat stuck on the pedal.
Ok. I'll check the cable. What's the easiest way to clean the throttle body if it is that?

Thanks.
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Old Aug 22, 2016 | 11:08 PM
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Might have a big vacuum leak or a bum coolant temp sensor. Make sure the cruise control servo isn't hanging it up.
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Old Aug 22, 2016 | 11:14 PM
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Originally Posted by ex-x-fire
Might have a big vacuum leak or a bum coolant temp sensor. Make sure the cruise control servo isn't hanging it up.
Ok I'll look into that as well. All I did was get on it as I was passing a car and now it seems stuck.
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Old Aug 23, 2016 | 12:17 AM
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Originally Posted by James84vette
Ok I'll look into that as well. All I did was get on it as I was passing a car and now it seems stuck.
Open the hood and hand work the throttle and see might just be the cable flipped off.
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Old Aug 23, 2016 | 02:40 AM
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Mine got hung up on the clamp that holds the flexible air coupling to the throttle body. I put the screw on the opposite side and problem solved.
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Old Aug 23, 2016 | 08:47 AM
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Thanks for all the responses.
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Old Aug 23, 2016 | 06:58 PM
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Originally Posted by antfarmer2
Open the hood and hand work the throttle and see might just be the cable flipped off.
Popped the hood and pulled the cable a bit and it was fine again. Must have got caught last night when I got in it.
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Old Aug 23, 2016 | 07:02 PM
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Originally Posted by James84vette
Popped the hood and pulled the cable a bit and it was fine again. Must have got caught last night when I got in it.
good job just how I like it cheap and easy.
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Old Aug 23, 2016 | 08:00 PM
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I'd take a closer look, you don't want a runaway. You don't want to treat this like a toilet that's always running & you just jiggle the handle to fix it.

Last edited by ex-x-fire; Aug 23, 2016 at 08:03 PM.
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Old Aug 23, 2016 | 08:07 PM
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Originally Posted by antfarmer2
good job just how I like it cheap and easy.
Lol
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Old Aug 23, 2016 | 08:09 PM
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Originally Posted by ex-x-fire
I'd take a closer look, you don't want a runaway. You don't want to treat this like a toilet that's always running & you just jiggle the handle to fix it.
Good point. The cable always seems a bit sticky when I get on it. I plan on taking it apart and cleaning. Bought some throttle body cleaner today and will do that as well.

Also doing the intake this winter so I'll have it all apart then.
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