IAC question
05-19-2011, 01:31 PM
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Car: 1989 IROC-Z
Engine: 5.7L V8 350 TPI
Transmission: Automatic
IAC question
Rookie question, but how should I go about "unscrewing" the IAC from the throttle body?
05-19-2011, 05:12 PM
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Car: 1989 IROC-Z
Engine: 5.7L V8 350 TPI
Transmission: Automatic
Re: IAC question
What I mean is; whats the best way to reach it? Anyone?
05-19-2011, 05:20 PM
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Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: IAC question
I just removed the throttle body on the last one I changed out.
Last edited by 3rd gen Will; 05-19-2011 at 05:24 PM.
05-19-2011, 05:25 PM
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Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: IAC question
If you are trying to clean the IAC, you should really pull the TB and clean the passages also.
05-19-2011, 05:26 PM
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Car: 1989 IROC-Z
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Re: IAC question
Sorry for the craptastic pic, but is that red thing my idle stop plug?
05-19-2011, 05:27 PM
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05-19-2011, 05:34 PM
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Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: IAC question
The red thing is a vacuum cap that is covering the vacuum port for your charcoal canister.
To my knowledge there is no such thing as an idle stop plug. There is a throttle stop, which is on the other side where the linkage is, it prevents you from "over opening" the throttle blades.
To my knowledge there is no such thing as an idle stop plug. There is a throttle stop, which is on the other side where the linkage is, it prevents you from "over opening" the throttle blades.
Last edited by 3rd gen Will; 05-19-2011 at 05:38 PM.
05-19-2011, 05:50 PM
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Car: 1989 IROC-Z
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Re: IAC question
Okay, makes sense. What I'm looking for is the Minimum air adjustment screw.. 
Saw a pic that had it on the upper right corner of the throttle body, but it's not there on my car... it's an 89 IROC-Z 5.7L 350.
Saw a pic that had it on the upper right corner of the throttle body, but it's not there on my car... it's an 89 IROC-Z 5.7L 350.
05-19-2011, 06:12 PM
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Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: IAC question
It's covered with a cap that you have to knock out. It on the top driverside corner of the TB. Right where the linkage is.
I am assuming you are having idle issues? if you have no vac leaks or other problems, follow this article.
https://www.thirdgen.org/tpimod2
I am assuming you are having idle issues? if you have no vac leaks or other problems, follow this article.
https://www.thirdgen.org/tpimod2
05-19-2011, 08:14 PM
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Car: 1989 IROC-Z
Engine: 5.7L V8 350 TPI
Transmission: Automatic
Re: IAC question
Yup idle issues...
when I start it, it idles high at first, then jumps around, then stalls.
when I start it, it idles high at first, then jumps around, then stalls.
05-20-2011, 09:53 AM
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Car: 1989 IROC-Z
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Re: IAC question
Yup. I am almost positive there is a vacuum leak.
First I am going to find and repair the vacuum leak, then I am going to give a good cleaning to the IAC and throttle body.
Then, I am going to make sure everything is set correctly.
Just need to make sure I know how to do everything. Thanks for your help!
First I am going to find and repair the vacuum leak, then I am going to give a good cleaning to the IAC and throttle body.
Then, I am going to make sure everything is set correctly.
Just need to make sure I know how to do everything. Thanks for your help!
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