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Posted by: jeremiah98125 Mar 30 2010, 12:16 PM

Can someone tell me if there's a GOOD complete vacuum hose diagram available for the '72 1.7? Besides Pelican site, Haynes & Drake manuals please.. They all leave out some of the hoses and are incomplete for my model. The Porsche shop manual any better? Somebody draw up a good one?

Posted by: Jeff Bowlsby Mar 30 2010, 01:41 PM

Here is a diagram for 1970-71 cars. and some additnioal documents. It looks like the differences in the 1972 hoses may be the decel valve, the PCV-system hoses and some hoses at teh airfilter. Can yuo make a good diagram up and post it? None currently exists that I have ever seen.




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Posted by: Jeff Bowlsby Mar 30 2010, 01:42 PM

Mo'


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Posted by: Jeff Bowlsby Mar 30 2010, 01:42 PM

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Posted by: Jeff Bowlsby Mar 30 2010, 01:43 PM

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Posted by: RacingDreamz Jun 5 2016, 08:57 PM

In this image, the part that is #10, is this right beside the fuel pump? There is a hose that was extremely loose at the top and the end of the hose went to something in the middle part of the engine area but for the life of me, I cannot find where it goes. Any suggestions?

It says in image that it connects to the 'additional air regulator'. What if you dont have the 'additional' air regulator?

Posted by: Dave_Darling Jun 5 2016, 09:52 PM

#10 is the Decel Valve. It opens when there is very high vacuum in the manifold, to allow air to bypass the throttle body.

The "additional air regulator" is what we usually call the AAR. It allows air to bypass the throttle body when the engine is cold, and closes off as the engine warms up blocking that extra flow. The AAR is part #5 in that same diagram.

--DD