slow96z

iTrader: (12)

I see this line and have no idea what it goes to. I don't see any babrs on the intake near it so I really have no idea.

Any of you guys recognize it?

monster81

its probably the opti vcuum harness...which year LT1 is this?

ss.slp.ls1

iTrader: (36)

Not sure. Trace it and see where it leads.

See if any of these help:

http://shbox.com/1/opti_vacuum_conn.jpg
http://shbox.com/1/egr1.jpg
http://shbox.com/1/air_pump_recall.jpg (bottom three squares)

sweetbmxrider

iTrader: (13)

i'd guess opti or evap but its best to just follow it back, shouldn't be that difficult once you know which direction its going.

AChotrod

iTrader: (17)

I was thinking evap also since its not in the pic.

the_merv

iTrader: (88)

I think that it's not the EVAP..unless it was cut. I'm thinking OPTI..

trippinholyman

looks like opti vacuum feed. the brake booster is hooked up there and the evap is a size in between the opti vacuum hose and the brake booster hose. you deleted your egr and air too huh? generally theres the egr lines there which are mucho small. I hooked my opti vacuum feed into the EGR via a 3 way fitting. Is there a hose somewehere under there with a blue and white cap looking thing in the middle and a barb on the end? hook that into a vacuum hose off the manifold and hook it to your opti unless you for some reason have the old nonvented style

monster81

that hose ur having could've been disconnected from the backflow prevention valve and blocked...this is how its suppose to be (check the link)

http://shbox.com/1/opti_vacuum_conn.jpg