2000 Ford Windstar running lean

Tiny
PHILY6
  • MEMBER
  • 2000 FORD WINDSTAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 139,000 MILES
My car running lean. Had the o2 sensor changed. Still running lean what could the problem be.
Wednesday, August 6th, 2008 AT 5:05 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Wednesday, August 6th, 2008 AT 5:12 PM

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