BPA2 - Check BPA Valve Function

^ Remove Bypass Air (BPA) valve from the engine.

^ Cool the BPA valve to room temperature.

^ When the valve is cool, blow through the valve port or air passage.

^ Verify that air flows freely through the valve.

^ Heat the BPA valve using a blow dryer, heat gun or equivalent.

^ Verify that the air moves outward to restrict bypass air flow.

^ Does the BPA valve function properly?

YES -- Return to Diagnosis by symptom. Symptom Related Diagnostic Procedures

NO -- Replace the BPA assembly.