Replaced fuel pump, 130K 5.3L 2WD, Opinions have led me to a possible O2 sensor failure? Idles rough if it does start and the only way I have found to keep it running for a few seconds is to press accelerator to floor in which case it revs up then back down and dies. Also, changed ffuel filter at time of fuel pump change. If it is the first time I have tried to start it for the day, it will start and idle rough, then begin to die and the only way I have gotten it to run for approximately 10-15 seconds is by full throttle. The engine will respond to the throttle somewhat and then back down and die. No trouble light or check engine lights, or at least not enough run time for me to see them. I have experimented with continuous cranking until it starts, average of 30 seconds before starting, but still does the same and dies. Checked OBD with code reader from Oreillys and it says no codes stored, but readiness monitors are incomplete including catalyst, evap. System, O2 sensor and O2 sensor heater not completed in their respective checks. Thank you for any suggestions or input.
Sunday, July 15th, 2007 AT 11:09 PM