: Vacuun ports on the northstar

01-10-09, 06:20 PM
OK it looks to me like there are 5 vacuum ports on the northstar intake housing at the throttle body mounting point.

One is for the MAP sensor, one is for the PCV line, one on the side is for the EVAP system and the other one on the side is for the FPR. That leaves one on the top.... What is that vacuum port for?


01-10-09, 06:25 PM
Power brake booster?

01-10-09, 07:05 PM
There's also an upstream (before the throttle butterfly) tap for the PCV clean air supply. On some Northstars there is (are) also vacuum taps for A.I.R. actuation, depending on whether there are 1 or 2 valves. Every model and year is different.

The underhood diagram or a correct FSM will have vacuum routing.

01-12-09, 01:51 PM
Power brake booster?

That was the one!!!

Thanks Ranger