I bought a project car, a 1996 960 Replaced head gasket and working through readiness codes.
Replaced sas vacuum valve, the sas readiness went to good. Now after clearing data it won't go ready .
I cannot blow through it when connect to the tube going into the head.
it opens when i check it while removed.
What am I missing,,, can something in the head be plugged?

Thanks for any suggestions.
Bob

 

How is the air injection routed from the head?