I wanted to bump this thread and say thank you.

My Wife's crossfire had a CEL this morning when she was on her way to work. She was able to go to an Auto Zone, get the code pulled, called me at work and I was able to find out the answer right away.

Great thread.

Tonight I cleaned the ground, check the fuses and check the valve. I'm not sure how much air should be able to pass through it, but if the CEL comes back I will be replacing it.

-John