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Feeling slow? Lack of boost? Unhealthy throttle response? Ya, I was too, until I swapped out my BPC! Side effects include speeding tickets and embarrassing others.
I recently ran into a P1662 code in my personal Viggen. The 9-3 Viggen is a T7 car, so this applies to all T7 cars (1999-2009 9-5, 2000-2002 9-3, 2003 9-3 vert, 1999-2002 9-3 Viggen).
The T7 BPC is a simple electronically actuated solenoid, it’s purpose is to divert boost pressure from the wastegate to control boost. There are three ports on it and they are marked R, W, and C as shown below:
These ports represent:
- R – Return, this goes back to your intake manifold via some one way valves
- W – Wastegate, this goes to your wastegate actuator
- C – Compressor, this is to your compressor outlet
The “bolt mod” is a simple test that will determine if your BPC is bad. Simply remove the hose from the R port and plug the hose with a bolt. If power is restored with the bolt mod, then you can either leave the bolt mod in place or replace the line and check valves that go back to the intake.