Dropping a new ZZ4 into a tpi car, also trading auto to 5 speed, and removing a/c.
I've pretty much got the engine bay all put back together except for one vacuum line.
On the right rear side of the tpi plenum there are two vacuum connections, the forward one goes to the fuel pressure regulator and the rear one goes to the egr solenoid right?
Well, the rear line has a T connection in it between the plenum and the egr solenoid.
The line coming off the T has a 90 degree elbow on it and has broken off just past that point.
It definitely appears to be a factory piece.
For the life of me I can't figure out where that T'd line goes.
I've checked my disassembly photos and my Haynes manual, still can't figuure it out.
Anybody???

 

I believe that it goes to the ac box! On mine, (TBI) I have it going from the EGR to the EGR control than from there it goes to the AC box.

I could be wrong.

I'll let you know tomorow.

 

That would make sense, although I don't remember disconnecting any vacuum lines from the a/c when removing it.
It would be a big help if you or anybody could confirm!

 

I believe the rear vac port goes to the vac canister (near the brake booster). It's for ac/heater controls.

The egr solenoid gets vacuum from a port on the bottom of the throttle body. It can be seen from the drivers side.

 

Thanks guys! I found the missing vacuum line buried inside the plastic wire wrap.