2004 ford expedition idle ruff/stall

2004 FORD EXPEDITION
72,000 MILES • V8 • 2WD • AUTOMATIC
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ADK3BOYS
  • MEMBER
  • 2 POSTS
i have a2004 ford expedition 4.6... with 72000 miles... the other day it started to idle very ruff and then stall when at a stop. check engine came on so i took it to auto zone to read codes... it threw 2 o2 codes. I read on a fourm that if the PCV valve is bad, it can thow false o2 codes... i bought a new PCV. but dont now how to install or where... also could it just be an issues with the mass air flow sensor or egr ? its seems that it would be rare for two o2 sensors to fail at the same time... please help
Mar 24, 2011 at 2:25 AM
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RASMATAZ
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 75,992 POSTS
Could be running too lean due to the following:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.

Mar 24, 2011 at 9:11 AM
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