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

More unidentified vacuum lines

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Old Dec 26, 2024 | 04:16 PM
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Default More unidentified vacuum lines

Just when I thought I had it figured out, I found these 2 lines that I can’t figure out where they go to. The first is a larger soft hose that looks like it comes through the firewall under the master cylinder. The second is a small rigid nylon line that comes off the T from the charcoal canister. Any help is app


reciated
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Old Dec 26, 2024 | 04:23 PM
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The soft line from under the master cylinder is surely for the cruise control. I believe it comes off of the brake pedal.

That hard line could be one of several possibles - I'm not gonna ponder a guess on it.

Last edited by 2011KLR; Dec 28, 2024 at 10:07 AM.
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Old Dec 26, 2024 | 05:41 PM
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The brake warning switch is also unplugged, in case you didn't already know, or unplugged it yourself.

At second glance, it looks like the switch itself is broken off on the master cylinder, so I guess that's why it's unplugged.

If I were you, I'd wrap it up and zip tie it and get it tucked away under the ecm or something so it doesn't get wrapped around and destroyed in the steering column.




Last edited by Natty C; Dec 27, 2024 at 06:03 PM. Reason: Typos...
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Old Dec 27, 2024 | 04:38 PM
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going by memory here so may be off. hard line on that side of engine, is that part of air injection system or EGR?
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Old Dec 27, 2024 | 06:59 PM
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This has me a little worried.
This has me a little worried.
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Old Dec 28, 2024 | 09:30 AM
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The hard line likely to vacuum tank for cruise? OP - do you have the FSM(Factory/Field Service Manual)?
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Old Dec 28, 2024 | 11:54 AM
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Originally Posted by WVZR-1
... OP - do you have the FSM(Factory/Field Service Manual)?

And if you don't, you really should buy them ASAP.

Last edited by Corvette_Dez; Dec 28, 2024 at 01:50 PM.
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Old Dec 28, 2024 | 01:41 PM
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Originally Posted by Corvette_Dez

And if you don't, you really should buy them ASAP. Rock auto currently has them.
I have all year C4 + I offer additional with every year C4 FSM that I supply. I believe I'm less expensive or very close to RA and I can deliver same day.
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Old Dec 28, 2024 | 01:50 PM
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Originally Posted by WVZR-1
I have all year C4 + I offer additional with every year C4 FSM that I supply. I believe I'm less expensive or very close to RA and I can deliver same day.
Even better!!!! I didn't know you sold them.
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