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16.04.2007: BPC
The middle outlet (marked "W") is connected to the wastegate, the top ("C") goes to the compressor housing of the turbo, and the bottom ("R") to the intake. The boost is adjusted by alternatively supplying the wastegate actuator with the pressure from the turbo or venting it to the intake, thus allowing the wastegate to stay closed at pressure levels exceeding the base boost.

The boost pressure control valve (BPC), also known as the APC solenoid valve, is used on most Saab engines to control the turbo charging pressure. The valves on Trionic5 models are often prone to failure. In some cases it just needs a good cleaning, but sometimes it becomes permanently stuck in one position, causing the car to either stay on base boost, or go into overboost until it hits the fuel cut. This article provides an insight on what could be casing these permanent faliures.


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