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

Idle is very high

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Old Jun 2, 2022 | 07:50 PM
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Default Idle is very high

My 94 C4 idle is 2000 rpm. I replaced the IAC & tried resetting the idle. But it still 1800 rpm. Any suggestions? How about good instructions on how to reset Idle?
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Old Jun 2, 2022 | 08:11 PM
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Check for vacuum leaks.
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Old Jun 3, 2022 | 08:47 PM
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Do not forget power brake booster line
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Old Jun 6, 2022 | 01:26 PM
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Here's another idea, take off the air inlet snorkel near the throttle body .
Put a little gas in a oil or squirt can and while its on a fast idle, squirter some gas in the throttle body . If the engine speeds up , you have a lean condition . If the additional gas makes the engine slow down , your air fuel ratio is good and fuel is sneaking in somewhere
Also make sure the throttle plate is closed by visual observation
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