In the far left corner of the under hood, just beneath the windshield, a vacuum hose connects to one of two nozzles parallel to each other. The hose connecting to the nozzle closest to the windshield leads to the mini-metal multi-passage vacuum routing assembly (tiny metal tubes welded together, the whole apparatus bolted onto the engine with two screws).

Somewhere on this hose is a break where you're meant to insert a special little black/white plastic piece, the black side allows air to be blown through it, but not sucked. The white side allows air to be sucked through it, but not blown.

Which directions should each color face? Does anyone know what part I'm talking about? How important is this part anyways?

 

Also one last bump on this, and now i also move this to the correct forum (i think)

 

white goes to the electric vsv thingy.
black goes to plunger thingy attached to the heater hoses.
thought I posted this yesterday, or this morning, but the forum decided to act wonky for a while...

 

Okay bear with me cuz i suk, but just to make sure, black goes towards that part just beneath the windshield?