Intake manifold: what are these?
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Joined: Jun 2004
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From: Anchorage.. but currently in Ft. Benning
Intake manifold: what are these?
Im buttoning the car up now and ive got the HVAC and EVAP ports on the passenger side all hooked up but the driver side is the one thats baffling me. What are these 2 ports for? I have deleted my EGR and AIR just incase thats what these are for. Thanks in advance!
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Joined: Jul 2009
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From: Bay Shore, NY
the big one i believe is for the brake booster, and the small one on my car connects to my opti and egr or fuel pressure regulator on back of manifold. I cant double check because my car is not here. 94 normally doesn't have a vacuum line to hook up to the opti, but i am running an MSD opti which has the vacuum hookup.
Last edited by wayneg1035; Nov 15, 2009 at 08:37 AM.
Thread Starter
Registered User
Joined: Jun 2004
Posts: 466
From: Anchorage.. but currently in Ft. Benning
Thank you for the response. The fuel pressure regulator is on the passenger side and like you said 93-94 does not have an opti breather. So i guess EGR? I like the color you painted your intake. Its different but still looks good. 
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Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
When you have a question like this, Shoebox usually has the answer (recognizing that most of his pictures are for a 95):
http://shbox.com/1/opti_vacuum_conn.jpg
http://shbox.com/1/4th_gen_tech1.html
On your 94, the PCV vacuum comes from the connection labeled for the Opti vent.
The EVAP connection is on the throttle body, not the intake manifold. The two vacuum nipples on the passenger side toward the rear are for the HVAC and the fuel pressure regulator.
http://shbox.com/1/opti_vacuum_conn.jpg
http://shbox.com/1/4th_gen_tech1.html
On your 94, the PCV vacuum comes from the connection labeled for the Opti vent.
The EVAP connection is on the throttle body, not the intake manifold. The two vacuum nipples on the passenger side toward the rear are for the HVAC and the fuel pressure regulator.
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