Low boost diagnosis - help appreiated
2002 WRX no mods, 41K miles, bought the car used so do not know history. The boost peaks at .05mpa(7.5 lbs) which I understand is just wastegate pressure. I replaced all of the vacuum lines, restrictors (brass insert and plastic) and a new "T" fitting - no change. I cross checked with another vacuum gauge- same result. car runs well but obviously not optimal.
The wastegate actuator looks like a diaphragm that , if bad would fail to keep the wastegate closed. Is that a possibility?
Has anyone known the actuator to fail?
any other ideas to test/diagnose?
thanks in advance for any comments or ideas.