Mystery Vacuum line

gr8ghost

Registered User
This is the one thing I have not been able to find where it goes. It is a vacuum supply line coming from behind the master cylinder on my 90 SC. I have it plugged so it's not leaking.
 

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Looks like the line that goes to the blow off valve on the plenum. Small hard plastic line. Should run the stock boost gauge.
 
What do you mean by blow off valve? The vacuum/boost gauge is connected to the vacuum tree right now.
 
That line should go to the bypass valve between the inlet of the blower and the return pipe from the intercooler. It goes underneath the intercooler tube and comes up near the vacuum actuator on the valve.
 
The black valve on the plenum that line should go to it. Working from my phone so I can't go digging through the pics. Sorry.
 
My bypass actuator has a hose coming from the intake plenum. But I have a code 88 so I changed the hoses to what has been suggested and the same code. I have code 88 as SC bypass circuit error. I should take a picture of my options today.
I someone can post a picture that would by helpful.
 
Last edited:
90 vs 95

So I pulled this motor out of my 95 and the reason I couldn't figure out that vacuum line is that The 95 has different plumbing. I'll picture both 90 then 95.
 

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