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P0449 Diagnostic Trouble Code Discussion for June 2008

EVAP Vent Solenoid Control Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0449
Help Request Posted
1999 Buick Century Custom 3.1L Poor Idle Quality VIN: 2G4WS52M8X
P0449: EVAP Vent Solenoid Control Circuit Malfunction. I need some help with this Buick. Runs good, good power below about 2500 rpm and at part throttle. Above a certain throttle opening, or at about 2500 rpm, under load or in neutral, it starts a rythmic idle fluctuation and loss of power that continues until you...
June 06, 2008