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2002 Ford F-250 FUEL MIXTURE

Tiny
ROBBYDUSTER
  • MEMBER
  • 2002 FORD F-250
Engine Performance problem
2002 Ford F250 Four Wheel Drive Automatic 72000 miles

MY 2002 SUPERDUTY F250 V10 WAS MISSING REALLY BAD CHANGED THE PLUG AND THAT TOOK CARE OF 80 % OF THE PROBLEM NEXT I BOUGHT TWO COIL PAKS AND STARTED SWITCHING THEM UNTIL I FOUND THE CYLINDER WITH THE MISS TRUCK RUNS GOOD EXCEPT STALL OCCASSIONALLY AT STOP CHECKED THE CODES (THE LITE CAME ON AFTER IT STALLED )CODES P0171 & P0174 BOTH BANK LEAN OK MY?IS WHAT WOULD CAUSE THIS AND IS IT OK TO DRIVE FOR NOW
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Friday, July 31st, 2009 AT 6:15 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Running with a too lean condition

* 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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Friday, July 31st, 2009 AT 6:20 PM

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