TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

IAC = 0 ... vacuum leak

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Old Jun 26, 2003 | 04:59 PM
  #1  
Joel Geerling's Avatar
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From: Saint Louis, MO, USA
Car: 91 Formula
Engine: 305 TBI
Transmission: 700R4
IAC = 0 ... vacuum leak

In ALDL a while ago, I noticed that my IAC reading dropped to zero after a while. Does this absolutely mean that I have a vacuum leak (or could it be ~normal)? If so, is it indicative of a particularly *bad* leak, or would any leak be sufficient to keep the computer from wanting to open the IAC valve?
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Old Jun 27, 2003 | 10:31 AM
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V8Astro Captain's Avatar
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From: 600 yds out
Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins
I found that most OEM stuff is setup up so that IAC at idle is very high (~40).

Have you turned the throttle stop screw in to open the butterflies up more? Opening the butterflies will make the IAC counts go down.

I'm in St.Louis...pm me we should meet up...
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