Could be needing a tune-up or running to rich due to the following below and other subsystem components
1. Excessive fuel pressure can be cause by restricted fuel return line
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
Friday, February 4th, 2011 AT 8:33 PM