Huh? Butterfly is supposed to be closed at idle. - Saab Performance Bulletin Board - Saabnet.com
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Huh? Butterfly is supposed to be closed at idle.
Posted by JohnB (more from JohnB) on Tue, 26 Oct 2004 06:08:29
In Reply to: Source of new IC pipe noise found, MS, Sat, 23 Oct 2004 18:36:52
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It is literally closed, just adjusted enough with the stop screw so that it doesn't jam when opening. The idle switch is then adjusted...the IAC motor/valve controls idle with a bypass hose. If you're hearing hissing it shouldn't be from a closed butterfly. Sounds more like a vacuum leak.
posted by 140.185.2...
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