help on '94 opti vacuum lines
Thread Starter
Registered User
Joined: Jul 2005
Posts: 131
From: dalton,ga
help on '94 opti vacuum lines
i recently purchase a 94 z-28 a-4 and it is pretty much a pig. 9.28 1/8 mile.the only mods are moroso cia and flowmaster muffler.i got to looking at the opti and one vaccum line goes about 3/4 way back in the intake.the other is dangling!any ideas on where it is suppose to go?i've looked pretty good and kind find anything off.also how do you tell vented from non vented.mine is a late 94(6/94).thanks
Thread Starter
Registered User
Joined: Jul 2005
Posts: 131
From: dalton,ga
Re: help on '94 opti vacuum lines
Originally Posted by v8pwrdz28
i thought the 93-94 optis didnt have any of the vacuum line,s i thought that was 95+.
i've heard it both ways.i heard that the late 94's had vented opti.is that the difference?
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: help on '94 opti vacuum lines
On the f-body, I know of no use of the vented opti before 1995. Maybe this 1994 had a conversion done to it.
You can find pictures and diagrams of the vented opti system on my Tech Page.
You can find pictures and diagrams of the vented opti system on my Tech Page.
Thread Starter
Registered User
Joined: Jul 2005
Posts: 131
From: dalton,ga
Re: help on '94 opti vacuum lines
Originally Posted by shoebox
On the f-body, I know of no use of the vented opti before 1995. Maybe this 1994 had a conversion done to it.
You can find pictures and diagrams of the vented opti system on my Tech Page.
You can find pictures and diagrams of the vented opti system on my Tech Page.
hate to sound really stupid,but i can't tell by the diagram either.the line with the check valve is attatched correctly.the other in the diagram looks like it goes under air intake duct.i took the duct loose and can't see anywhere for it to go.thanks for your help,i like your website!
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: help on '94 opti vacuum lines
Originally Posted by 95lt1a4
hate to sound really stupid,but i can't tell by the diagram either.the line with the check valve is attatched correctly.the other in the diagram looks like it goes under air intake duct.i took the duct loose and can't see anywhere for it to go.thanks for your help,i like your website!
http://shbox.com/1/opti_vacuum_harness.jpg
http://shbox.com/1/opti_vacuum_hose.jpg
http://shbox.com/ci/opti_vent.jpg
Thread Starter
Registered User
Joined: Jul 2005
Posts: 131
From: dalton,ga
Re: help on '94 opti vacuum lines
thanks,guess i didn't look far enough on your site
.my intake elbow doesn't have the place for it to go.i guess it being a 94 something has been changed.i understand what to do now. 
Administrator
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Re: help on '94 opti vacuum lines
Do the connections on the Opti look like the factory parts in Shoebox's pictures? There is a site that shows how to "convert" a non-vented Opti to a (sort of) vented unit. Involves drilling holes and epoxying connections on it. Maybe someone did that to your Opti.
I have a VERY late 1994, one of the last ones built, and it left the factory with a non-vented Opti.
I have a VERY late 1994, one of the last ones built, and it left the factory with a non-vented Opti.
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: help on '94 opti vacuum lines
Originally Posted by 95lt1a4
thanks,guess i didn't look far enough on your site
.my intake elbow doesn't have the place for it to go.i guess it being a 94 something has been changed.i understand what to do now. 
Thread
Thread Starter
Forum
Replies
Last Post
dbusch22
Forced Induction
6
Oct 31, 2016 11:09 AM