JC - Combined with the 0446, the lean condition can be traced to the EVAP system. This is further corroborated by the hard start after fueling issue...dead giveaway (also EVAP related).
P0446 is the key.
Quote:
P0446 indicates that there is a problem with the activated charcoal filter / tank vent system. This is causing the mixture problems leading to the 1128/1130 codes. Possible causes for the 0446 code include:
- Purge air line plugged
- Tank vent stuck in the open state (vacuum continuously enters the tank system from the intake pipe)
- Activated charcoal filter shutoff valve is plugged/stuck in closed state
- Flow resistance of the activated charcoal filter is too high (filter deformed/plugged)
- Pressure sensor closes incorrectly (polarity reversal)
The factory manuals have a diagnosis procedure to determine and remedy the cause.
-Todd
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