1994 Chevy Corsica Engine Idle is too high

ESRMAN

MEMBER
1994 CHEVROLET CORSICA

Engine Performance problem
1994 Chevy Corsica 6 cyl Front Wheel Drive

The idle is too hugh.

How do I et it to mkae it lower?

I turned the throttle screw way in and it still stays up.

The check engine light comes on after a few minuites runnig.

I suspect a oxygen sensor.

7 Replies

BIG_JAY

MECHANIC
121 POSTS

Sonds like you have a realy big vacuum leak or a stuck IAC (Idle Air Controler). Open the hood with the car running and listen for a loud hissing noise. Try that first and get back to me.

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Monday, October 12th, 2009 AT 7:51 PM

ESRMAN

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6 POSTS

Don`t hear that sound.I know the sound cuz I`ve had it before in other cars.

Also sounds like a dentists thingy they put in your mouth to remove to saliva, only not quite as loud.

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Tuesday, October 13th, 2009 AT 9:44 PM

BIGJIM79

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239 POSTS

This is a leaking intake gasket or the vacum line right underneath the back of the intake plume. It is very prone to rotting or severly cracking in which case it will cause it to idle high.

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Sunday, November 29th, 2009 AT 2:56 PM

ESRMAN

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6 POSTS

I fixed it.

It was the vacuum line running overtop of the carb under the metal bracket holding the throttle cables/.

It goes to the PCV valve.

It was the grommet in the hole and you cannot buy just that, you have to get the whole line which costs about 40.00!

Thanks for all your help

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Monday, November 30th, 2009 AT 6:44 AM

BIGJIM79

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239 POSTS

I'm glad that we could help.

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