im pretty sure im suppose to be avle to read vacuum on this port but im not. im using s4 turbo manifolds with a s5 throttlebody. any ideas? i get vacuum on the bottom port on the rear of the manifold.

 

Is that the port that is NOT a vacuum port in order to equalize pressure for the fuel injector air bleeds and oil injector tops?

Those two places should have the non vacuum source off the throttle body.

 

alst time i recall it is suppose to have vacuum there. on bottom port in the front

 

Is the black phenolic spacer in between the UIM and TB on correctly?
Backwards?
Maybe the fact that you're mix and matching the UIM and TB messed it up?

Yeah, normally the top and bottom fittings are post-TB or see vacuum.
The middle one is not.


-Ted

 

the arrow on the spacer is poiting towards the intake manifold.
i think im using a s4 spacer as well.
i heard the bottom port was the best one for fpr and haltech map sensor but if it doesnt work which other one can i use that gives a clean signal?