Question about 2003 Ford Expedition

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P-0171 Trouble Code 99 Ford Explorer 4.0

Missing at start up and low rpm at times it seams to go away.

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  • yadayada
    yadayada May 11, 2010

    this is a engine lean code, you need to have the dealer run further diagnostics to determine the cause.

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Per http://www.odb-codes.com:


Causes A code P0171 may mean that one or more of the following has happened:

  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible Solutions Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure
I hope this helps with your Bank1 issue. Best of Luck to you.


Posted on May 09, 2009

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RE: Johnny brown- 2003 Sebring multiple cylinder misfire 3.0 New distributor new crankshaft sensor new plugs new wires good compression injectors good... Installed new EGR started with cold engine and


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http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

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Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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Click the link below:-----


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http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Number 3 and 4 are not firing from coil on 2002 subaru outback 2.5


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=========

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http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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