 Emissions lines criticality for 1.7 FI running |
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| Tdskip |
 Jan 11 2019, 01:31 PM
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#1
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Advanced Member  Group: Members Posts: 3,678 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None 
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This seems like a worthwhile enough topic that I want to break it out as a separate thread.
My ‘73 1.7 FI car currently has these lines open, and I’m not sure if that will impact how the engine runs. Obviously everything ultimately should be connected but I’m not sure if it’s critical to the engine running properly or not. EDIT - wrong picture, sorry. |
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| mgphoto |
Jan 11 2019, 01:58 PM
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"If there is a mistake it will find me" Group: Members Posts: 1,335 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
You shouldn’t have anything open to the atmosphere, dirt particles can enter past the air cleaner.
I’m not sure what you are pointing to? You can remove the deaccl valve and cap all three vacuum connections. Capping will change the idle mixture as air is bypassing the throttle body. |
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| Tdskip |
Jan 11 2019, 03:18 PM
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#3
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Advanced Member Group: Members Posts: 3,678 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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Posted the wrong picture, sorry.
This is what is open.  |
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| bbrock |
Jan 11 2019, 03:50 PM
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#4
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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That's the spark arrestor for the crank case ventilation. There should be a hose running from the bottom ports to each cylinder head and the top port connected to the port on the oil filler. Not critical and I think there is debate about whether it is good, but disconnected means you could have an open port on each head puking oil and an open port on the filler sucking dirt without having it hooked up or some alternative arrangement.
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| Tdskip |
Jan 11 2019, 03:56 PM
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#5
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Advanced Member Group: Members Posts: 3,678 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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QUOTE(bbrock @ Jan 11 2019, 04:50 PM)  That's the spark arrestor for the crank case ventilation. There should be a hose running from the bottom ports to each cylinder head and the top port connected to the port on the oil filler. Not critical and I think there is debate about whether it is good, but disconnected means you could have an open port on each head puking oil and an open port on the filler sucking dirt without having it hooked up or some alternative arrangement. Thanks Brock, very helpful for a Type 4 newbie. I’ll connect it all up but good to be able to mentally separate it from the engine running issues. |
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