1997 Ford F350 smog

  • 1997 FORD F-350
  • V8
  • 4WD
  • 11,300 MILES
I recently purchased 1997 F-350 4WD check eng light was on P0171 and P0174 running lean found broken vacum lines repaired also at same time noticed battery terminals dirty so disconnected battery and cleaned since I did this it takes awhile for the computer to reconect to the I/M monitors I have put 40 miles on truck but still show that ox heat, ox sense, and catylist monitors are inc. Can you give me an idea how many miles it takes to get this thing (computer) to connect fully and is there a way to speed things up I tried to smog it but of course it failed but not on the actual testing the state computer could not connect to vehicle computer because of I/M monitors thanks
Wednesday, April 15th, 2009 AT 6:02 PM

1 Reply

  • 75,992 POSTS
P0171/P0174 lean condition:

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, April 15th, 2009 AT 6:06 PM

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