C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Many broken and unconnected vacuum lines, where do they go?

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Old 02-11-2019, 09:11 PM
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rainier94
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Default Many broken and unconnected vacuum lines on 94 LT1, where do they go?

I love my new to me 94 polo green coupe, and I had a PPI done on it and they mentioned that it needed the vacuum lines replaced. But I've found almost all of them are not connected and after a day I haven't found a master diagram or video showing where they connect to. Can someone help me? I can figure out the gauge I just need to know where do they connect? Thanks for all your help in advance.




Drivers side




Drivers side again with the plastic cover removed.





I see the two going in but is there supposed to be something going out?



Another one coming under the intake manifold near the opti I think?



Drivers side up closer to the fire wall.

It's amazing that the car drives as well as it does.

Last edited by rainier94; 02-11-2019 at 09:40 PM.
Old 02-11-2019, 09:36 PM
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STL94LT1
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Top two look like a vacuum harness for a vented optispark and should be connected. Although the 1994 didn't come with a vented opti, it could have been updated.

Third picture, there is no line going out.

Last edited by STL94LT1; 02-11-2019 at 09:39 PM.
Old 02-12-2019, 07:18 AM
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65Z01
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Is there possibly still a vac. line plumbing diagram under hood?
Old 02-12-2019, 08:25 AM
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Jeffs82c3
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Time to buy the manual.
Old 02-18-2019, 11:22 PM
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Gunho
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The whit nipple on the drivers side is some sort of pressure release point. No vacuum line goes to it.

The passenger side walve does not have anything going into the rear. It’s a vent.
Old 02-18-2019, 11:28 PM
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Gunho
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I don’t see anything in your photo of a vacuum line around the intake passenger side. But here are a few photos of my 94 if it helps.


Old 02-18-2019, 11:33 PM
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Old 02-20-2019, 06:34 PM
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bud40oz
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the top 2 pictures should be quite easy to figure out, just push the vacume tube back on the little white thingamajigy there and that should solve that one. most of the other pics just look like wire loom to me, i don't really see many problems other than the top 2 pics to be honest.

pic number 4 its hard to tell but it looks like you might have a vacume line that is actually broke in half there, do you see another line down below that is just laying around and not going to anything?

Last edited by bud40oz; 02-20-2019 at 06:40 PM.

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