Question about 2003 Ford Expedition

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Ford expedition 4.6 liter got cdes p0171 and p0174 and replaced maf sensor still runs real bad and dosent idol. what now?

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On top of engine to the back, and down a little bit by firewall, will be some vacuum line's, the one with the elbow will be leaking, to check start engine and feel back there, when you fine the vacuum leak you'll know, replace that elbow, and engine will run fine, save the new part you replaced more then likely it's good.

Posted on Aug 23, 2010

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Try starting the car and wiggling the connector for the MAF sensor. Also try tapping the MAF sensor. If the idle changes or the car stalls replace the MAF sensor.

The second shop should recognize that these codes don't have anything to do with the ignition module.

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OBD Codes P0401; P0171; P0174. EGER valve sensor vacuum tube winds up upon starting; will not idle. What have others found to be the issue? EGR sensor has gotten very hot and plastic tube connectors have...


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Codes po171 and po174 0n a 2002 ford windstar\


It sounds like you running lean; too much air, not enough gas.
Go to these links to get some additional information:
http://www.obd-codes.com/p0171
http://www.obd-codes.com/p0174


  • P0171 System too Lean (Bank 1)
  • P0174 System too Lean (Bank 2)

    • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filtersmag-glass_10x10.gif can 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 pressuremag-glass_10x10.gif

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