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Join Date: Nov 2010
Posts: 660
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CIS: what is this?
Hi -
I've been trying to track down a high warm idle (1200 rpms) and read about the AAV. During hunting saw this (probably decel valve). Is that correct? If it's removed from the system how should the vacuum lines be routed? The more I dig into this car the more it surprises me.  Untitled by sicklyscott, on Flickr
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08-28-2014, 02:56 PM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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 Vacuum line to decel valve is missing. 
Last edited by stlrj; 08-28-2014 at 04:50 PM.. |
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08-28-2014, 04:47 PM
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the decel valve is normally closed and the large lines blocked until the vacume from decelerating opens it to allow more air through and prevent poping from being rich. it could cause high idle if stuck open or the diaphram is punctured but thats more a symptom of the aar which is bottom left of your picture
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82 SC , 72 914 Last edited by porsche930dude; 08-28-2014 at 04:56 PM.. |
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08-28-2014, 04:54 PM
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Posts: 660
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Should I be connecting those. 2 thicker tubes together to rule out the decel valve sticking slightly open?
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08-28-2014, 06:44 PM
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Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,771
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The two big hoses are fine as they are. But you do have to close the small hole at the top.
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08-28-2014, 07:24 PM
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Porsche
1972 porsche 914
