I'm probably the only guy to ever ask how to put AIR back on his car but I need it for emmisons. Its a 91 RS 5.0 TBI. I've got the pump on and the black box bolted to it but I cant figure out which hose goes where. Which to the cat ,which to the manifolds,etc. Any help would be great.

 

Does your Port/Divert valve look like this:

 

It looks alot like that except that top port is facing the other way on mine. My basic problem is that I have 4 ports that a hose can fit on but I can only find 3 places to run a hose to. 1 for each manifold and 1 for the cat. I cant quite tell from your picture how many hoses come off it. Is there like a 2 into one fitting that takes care of 2 hoses on that car? As I have mine now, I have left the top port unhooked and it makes a low whining noise everytime I slow down. Any idea what it should be hooked up to? Thanks for you help.