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

Idle Control Switch Issue

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Old Mar 10, 2010 | 11:58 AM
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From: west chester pennsylvania
Default Idle Control Switch Issue

87 Coupe 4+3


I need a little help. About a week ago whenever I would go into neutral and let the car idle it would instantly spike up to 2500+ RPM. I found a broken IDLE vaccumm line and fixed it, but it still persisted.

2 days ago I took off the idle control switch, cleaned it up, and lubed up the throttle lever thing, put it back on and it ran great for 2 days, now its acting up again. Im pretty sure that the lever on the switch is sticking.

Is there any tips or tricks to free this up, or am I just giong to have to buy a new switch?


thx
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Old Mar 10, 2010 | 02:18 PM
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Old Mar 10, 2010 | 02:59 PM
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2 days ago I took off the idle control switch,,,
Are you refering to the Idle Air Control (IAC) located under the TB??
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Old Mar 10, 2010 | 03:09 PM
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Originally Posted by 65Z01
Are you refering to the Idle Air Control (IAC) located under the TB??

Yes, sorry
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Old Mar 10, 2010 | 03:21 PM
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IAC is the canister shaped, electric valve. The throttle position sensor, is the thing with the lever. If the lever is sticking, replace it.
The throttle position sensor and minimum idle, should be re-set, after installation.
http://www.lbfun.com/warehouse/tech_...ch%20Paper.pdf
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