The bypass valve is integrated in the supercharging system. When low engine power is required, the bypass allows air to enter the engine without passing through the supercharger. The supercharger bypass valve operates in the following manner:
Under normal engine operating condition vacuum is supplied to the bypass valve. The valve opens, diverting excess airflow back into the air plenum. This prevents the supercharger from “cavitating.”
Cavitating causes reduced performance, increased temperature, and poor fuel economy.
At high engine demands, vacuum is removed from the bypass valve causing it to close. This directs all airflow from the supercharger to the intake manifold.
The supercharger boost (SCB) solenoid is used to control intake manifold vacuum to the vacuum bypass actuator. The PCM transmits an output signal to the SCB solenoid, which activates the solenoid to bypass vacuum when the engine is under maximum boost, reducing the boost pressure by up to 3 PSI.
Could belt slippage do this. I'm buying a freaking boost gauge this weekend to solve so e of these questions. But slipping =no boost could that equal rich condition