Direction of Secondary Air Check Valve

[Baconaire]

I bumped part of my Sec Air System loose when working on something else. I know the vacum accuates the Change Over valve and the electic change over controls that, but I suppose my question is, where does the vacuum resivoir get it's vacuum from? And where does what does the check valve block?

For now I put the check valve between the vaccum resiovoir and the intake plenum with the 'stop' side of the check valve facing the resivior assuming it somehome gets vacuum from the intake plenum. With the valve reversed I assume it would not be able to hold vacuum. Please let me know if I got that wrong and it should allow air to be dumped into the plenum. I find Sec Air system to be confusing for what it does. As I write I think my decion was wrong.

Should it not allow air into the resivoir from the intake? Vacuum would be reversed. I'm so condused!

MY1998, all parts are new, seen the pic of parts. Really just need a simple 'black or while faces plenum"

Do racers just get rid of the whole shebang and only get emissions tested when the engine is warm.

[tholyoak]

It is a one way check valve, black side goes toward vacuum source, ie the intake manifold.

-Todd