2005 Bonneville EVAP System
2005 Bonneville SE 3.8L. Reoccurring EVAP codes:
PO442 EVAP System Small Leak Detected
PO455 EVAP System Leak (Large)
I understand this can be related to something as simple as the gas cap but I have cleaned the metal filler neck well and the codes still reappear. After replacing the engine in my 2002 Buick LeSabre 3.8L yesterday, I'm wondering if the EVAP leak is actually coming from the intake gaskets. There is no visible leakage but with the know history of this engine and EGR/Plenum/Intake issues, would it be wise to just replace the plenum and intake gaskets?