We have a 74 Mav 250 car w/a C4 trans. The modulator has 2 ports one I know goes to the intake for a vacuum source like any car, but where does this small port go to??? I've been all thru the 74 shop manual & there is nothing about this anywhere, also the internet is no help either. Can I just stick a regular 1 port modulator in there since we're getting rid of all the 74 stock emission stuff anyway????
I will find out for you if I can my 1970 maverick with the 250 should have that same ports,I'll check ina lil ,I got sick by over eatin nd now I'm throwin up,no I don't have eatin problems I just had too much indica(cannabis)
The rear (larger) port is the only one that you need. It connects directly to manifold vacuum. You can also replace the modulator with a green stripe modulator with only one port. The secondary port was originally connected to the EGR vacuum to make the shift softer - the stock shift is soft enough.
