With it unconnected and the car running rough, I could not get the rpms to raise to the desired 450 rpms. I turned the screw until it wouldn't go out anymore and it didn't raise it at all. However now with the connector plugged in the car idles at about 500-550 in drive and around 600 in park.

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Founder of the Greater Cincinnati F-Body Association
Greater Cincinnati F-Body Association
1988 Yellow Trans Am GTA
Click here for photos

 

You're supposed to turn the screw IN, ei. clockwise to raise "minimum air idle speed" (not IAC).

 

I did turn the screw on the inner side of the throttle body.

 

Describe exactly which screw you're using to try to adjust the idle speed and the direction that you're turning it.

We need to make sure that you're working with the correct adjustment screw.

The correct screw takes a very small torx head driver and is located on the driver's side of the throttle body, just in front of the throttle cable and is recessed in an aluminum 'hole'.

Jake


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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9, TPIS Long Tube Headers and DynoMax Super Turbos (HATE 'em)

[This message has been edited by JakeJr (edited September 14, 2001).]

 

That is the one I was adjusting, I turned clockwise and counter clockwise, but the rpms didn't budge

 

Okay, as you screw the torx head screw in the clockwise direction, the screw will begin to extend forward. As is does it will push the throttle farther and farther open and in doing this the idle speed will increase.

As you turn the screw you can actually see it contacting the throttle arm on the throttle body. The threads on the screw are of a fine thread design and it may take quite a few turns to cause it to move outward enough to make an idle speed change.

Can you see the screw making contact with the throttle body throttle control arm?

Keep us posted.

Jake




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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9, TPIS Long Tube Headers and DynoMax Super Turbos (HATE 'em)

 

Yes it is making contact, I just think since the idle rough maybe I couldn't tell.

 

So what's happening with the idle problem?

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9, TPIS Long Tube Headers and DynoMax Super Turbos (HATE 'em)