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Scorpion Forums Junkie Location: Menai area of Sydney Registered: June 2003	Re: 4AGE hose identification Wed, 25 February 2004 11:37 I'm probably confusing everyone by too much info and not enough access to motors to test what I'm saying. However, the port inside the body is for the idle air valve and is fully open when the engine is cold. As the engine warms up, this valve is closed off more and more as the temperature rises and the idle gradually drops from around 3000rpm to "normal". If you restrict the amount of air going into the thick inlet pipe on the bottom of the throttle body, you can reduce the fast idle from around 3000rpm to whatever figure you want. I have looked at several cars over the last few months to try to understand how that air is regulated but nearly every car is different. From what I can see, vacuum valves are used to adjust the fast idle and idle ups such as A/C are linked to let additional air in when the idle needs to be increased due to load. That's why it looks like the thick pipe goes to the A/C idle up ... because it does but that's not all it's connected to. This url has some interesting info on how the idle air valve works - from page 10 on for 4Axx engines and page 14 for 4AGE. http://www.autoshop101.com/forms/h26.pdf [Report message to a moderator]

	Subject	Poster	Date
	4AGE hose identification	bmak	Thu, 19 February 2004 11:20
	Re: 4AGE hose identification	bmak	Thu, 19 February 2004 11:49
	Re: 4AGE hose identification	HighRolla	Thu, 19 February 2004 12:46
	Re: 4AGE hose identification	IRA11Y	Fri, 20 February 2004 06:16
	Re: 4AGE hose identification	HighRolla	Fri, 20 February 2004 06:20
	Re: 4AGE hose identification	bmak	Sun, 22 February 2004 11:58
	Re: 4AGE hose identification	HighRolla	Sun, 22 February 2004 12:47
	Re: 4AGE hose identification	ae95	Sun, 22 February 2004 15:00
	Re: 4AGE hose identification	HighRolla	Mon, 23 February 2004 00:04
	Re: 4AGE hose identification	HighRolla	Mon, 23 February 2004 05:22
	Re: 4AGE hose identification	HighRolla	Mon, 23 February 2004 05:44
	Re: 4AGE hose identification	ctan13	Wed, 28 September 2005 21:04
	Re: 4AGE hose identification	natez	Mon, 23 February 2004 10:04
	Re: 4AGE hose identification	HighRolla	Mon, 23 February 2004 10:32
	Re: 4AGE hose identification	natez	Mon, 23 February 2004 10:50
	Re: 4AGE hose identification	Scorpion	Mon, 23 February 2004 11:12
	Re: 4AGE hose identification	bmak	Mon, 23 February 2004 12:07
	Re: 4AGE hose identification	HighRolla	Mon, 23 February 2004 12:35
	Re: 4AGE hose identification	Scorpion	Mon, 23 February 2004 12:37
	Re: 4AGE hose identification	ae95	Tue, 24 February 2004 08:03
	Re: 4AGE hose identification	ae95	Tue, 24 February 2004 08:35
	Re: 4AGE hose identification	HighRolla	Tue, 24 February 2004 09:13
	Re: 4AGE hose identification	bmak	Tue, 24 February 2004 09:57
	Re: 4AGE hose identification	HighRolla	Tue, 24 February 2004 10:18
	Re: 4AGE hose identification	Scorpion	Tue, 24 February 2004 12:03
	Re: 4AGE hose identification	HighRolla	Tue, 24 February 2004 12:42
	Re: 4AGE hose identification	Scorpion	Tue, 24 February 2004 14:00
	Re: 4AGE hose identification	ae95	Tue, 24 February 2004 15:53
	Re: 4AGE hose identification	HighRolla	Tue, 24 February 2004 23:44
	Re: 4AGE hose identification	Scorpion	Wed, 25 February 2004 03:30
	Re: 4AGE hose identification	ae95	Wed, 25 February 2004 05:12
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 05:27
	Re: 4AGE hose identification	ae95	Wed, 25 February 2004 05:42
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 05:56
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 06:43
	Re: 4AGE hose identification	ae95	Wed, 25 February 2004 06:34
	Re: 4AGE hose identification	ae95	Wed, 25 February 2004 07:14
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 07:53
	Re: 4AGE hose identification	ae95	Wed, 25 February 2004 08:57
	Re: 4AGE hose identification	Scorpion	Wed, 25 February 2004 11:37
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 12:27
	Re: 4AGE hose identification	Scorpion	Wed, 25 February 2004 12:56
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 13:10
	Re: 4AGE hose identification	HighRolla	Wed, 25 February 2004 13:31
	Re: 4AGE hose identification	HighRolla	Thu, 26 February 2004 02:43
	Re: 4AGE hose identification	ae95	Thu, 26 February 2004 04:57
	Re: 4AGE hose identification	TopSecret72	Tue, 19 July 2005 10:31
	Re: 4AGE hose identification	sonwill	Thu, 21 July 2005 08:25
	Re: 4AGE hose identification	TopSecret72	Thu, 21 July 2005 12:51

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