Hi. I am in the middle of replacing the o-ring for the oil filler and found this random hard line that is capped off.

Anyone know what this is and where it goes?

The sequential vacuum diagram doesn’t show this anywhere - unless I missed it.

Thanks!

 

Not certain, but it looks like the unused line that runs along with the turbo oil feed hard pipe. If that is it, I think the other end is between the alternator and the coolant filler neck, under the duct from the Y pipe to the intercooler.

 

Yes, that tube is routed to the primary turbo inlet.

 

This.
I eventually figured out yesterday. It's been so long since I've wrenched on this car that I'm forgetting stuff
Thanks!

 

Hard line that runs across the motor to the primary turbo inlet. On a modified car it tends to dump oil into the turbo and it is preferable to cap that line and run it to a vented catch can.