I’m swapping my NB1 manifolds into my NB2. I’m running MS, so no emissions equipment needs to be hooked up. Only cruise, VICS and MAP.

I have the manifold apart and blew air through ports to try and figure out what they do.
All the ports up top just go straight into plenum, no biggie. I’ve read that the back port is bad for MAP, and the front ports are also bad for MAP readings.

Things get a little strange on the bottom portion of the manifold. You have 1 tee port that comes right off the runner for cyl #1. The Service manual Vacuum diagram shows this is typically hooked up to the VICS solenoid.

I don’t have EGR, and two of the ports seem to be internally connected to the EGR solenoid ports. However their path does go through the bottom intake into the top’s plenum through a 3/8” hole in the corner. Is this a good candidate for MAP?


Cruise can come off anything (I think)

Does anyone have a picture of their NB1 manifold off the car with vacuum lines on? Mine came with no lines.

There’s a port that seems to be on the cyl #3 runner, I’m not sure what function that serves. Unfortunately I couldn’t find a comprehensive vacuum diagram in the service manual.



TL;DR tryna figure out what ports on my NB1 manifold I should cap off, and which ones to use for VICS, MAP and cruise.

 

Here's what I have, hope it helps. Someone smarter than me should answer your other questions.


NB1 Vacuum Ports. Runner 3 has a line with check valve (I assume) to the front of the Intake Manifold.

NB1 Vacuum Ports, unconnected one above goes to the hose circled on bottom right below.

NB1 Vacuum Port destinations. Upper right from the port behind runner 2. Lower right from the port on the IM intake port.