Did you do the little PCV vavle test where, with the valve properly installed,
you pinch the PCV hose and listen for a click?

Might not be good for all cars. Post your year and model, and I might be able to
tell you.

"alan" <no-longer-valid@yahoo.com> wrote
> When I first took it out, it was fairly clean inside and made a light
> rattling noise when shaken. If you blow gently from the intake side,
> air will pass through, but if you blow slightly harder, it stops.
>
> I then cleaned it out with throttle body cleaner. Now it rattles more
> loudly, and I have to blow harder before the valve closes. Does this
> sound about right?