Question about 2001 Ford Econoline

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2001 Ford E150, V6. Stutter/hesitation upon acceleration. Getting lean codes, P0171, P0174. Resealed Upper & lower intake, injector seals, replaced mass air flow sensor, replaced PCV valve, same problem. Infact, it seems worse. Idles smooth but when you give it gas, it hesitates and backfires, if you give it gas very slowly its ok.

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  • jptcat169 Oct 16, 2009

    It was the hose on the fuel pump inside the tank, it had a split in the middle of it!!!!!
    What a nightmare to figure out.

  • Tony Tony
    Tony Tony Jan 02, 2012

    sounds like a bad cat convertor disconnect exhaust and test drive , if no hesitation then replace cat

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  • Master
  • 1,201 Answers

Have the throttle position sensor checked, might be faulty.

Posted on Oct 01, 2009

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On a 2000 explorer 4.0 Soho do I have to remove the injectors to remove the lower intake


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Code p0171 and p0174


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Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
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