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  1. #1
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    Ford Techs please.

    '99 Ranger XLT 4 wh dr 4.0 (single cam) V-6 w/check engine light on.

    Codes are:

    DTC P0171
    System Too Lean
    (Bank 1)

    and

    DTC P0174
    System Too Lean
    (Bank 2)


    The "experts" at Auto Zone said:

    It's one or more of the four different O2 sensors, the mass air flow sensor or a fuel pump
    Gee, thanks for narrowing it down for me!

    Any suggestions guys? About 104K runs like a top and light just came on this morning. I have my own code reader here but am sure it will say same thing.
    Can it be lean enough to do damage until I figure out whats going on??

    Oh yeah, the "expert" at the parts store was nice enough to print off all the possible defective parts for me.

    With both side being lean I'm gonna guess MAS?

    As always, thanx a million guys!
    Gary

  2. #2
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    Test fuel pressure!

    Fuel pump or pressure regulator seems to be the problem.

    By the year it's almost time for new electric pump!


    Auto Zone loves selling those O2 Sensors!
    “The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”

  3. #3
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    MASS air flow sensor has a major fault code. It has a self test.

    I don't see the OB2 missing it.

    Al
    “The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”

  4. #4
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    Gary, I did find this:

    Some vehicles may exhibit a check engine light on and lean Diagnostic Trouble Codes (DTC's) P0171/P0174 (system too lean bank 1 or 2) stored in memory.

    Do not replace PCM (Powertrain Control Module), MAF (Mass Air Flow), or HEGOs (Heated Oxygen Sensors), as these parts are not the root cause of the lean codes conditions described.

    These conditions may be caused by a loose fitting on the fuel pressure regulator vacuum line on the intake manifold end and/or leaking isolator bolts/port gaskets in the lower to upper intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.



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  5. #5
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    Quote Originally Posted by Scream And Fly
    Gary, I did find this:



    These conditions may be caused by a loose fitting on the fuel pressure regulator vacuum line on the intake manifold end and/or leaking isolator bolts/port gaskets in the lower to upper intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.
    I love me!!!
    “The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”

  6. #6
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    You guys rock!!

    I freagin love this site! Car questions, stereo questions ...it just doesn't matter!

    Greg, where'd you find that?? Will trouble shoot this weekend.

    Al, Thank You Sir!

    P.S., Greg I'm thinking I need some pixs of my boat runnin. Think you can help a brother out?

  7. #7
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    Gary, I Googled it and came across that - I'll see if I can find where I got it (I should have bookmarked it).

    Photos are no problem at all - sounds like a great idea!

    Greg


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  8. #8
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    Maybe we can work something out the RR?

    Will you and Maureen have shirts and stickers there??

    Thats all I needed to know about your Ford info. Was just curious where the info came from.

  9. #9
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    Unfortunately, it looks like I won't be at the River Ranch. It's looking like I'll have to cover the OSS race in Destin that weekend. Maureen will be at the RR though, and she'll have shirts and goodies.

    I still may be able to make it to the River Ranch (I hope), but we'll see...

    Greg


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  10. #10
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    Really....

    Quote Originally Posted by Scream And Fly
    Unfortunately, it looks like I won't be at the River Ranch. It's looking like I'll have to cover the OSS race in Destin that weekend. Maureen will be at the RR though, and she'll have shirts and goodies.

    I still may be able to make it to the River Ranch (I hope), but we'll see...

    Greg
    Well, I sure hope you can make it. Talked to my buddy Mike (msg11) from Ohio w/the 300X Mirage and he's towing down for it and probably stay with us for a week or so after. May sneak to the Keys while he's here.
    Tonys coming down too but flying his plane down.

  11. #11
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    Believe me, I want to go - badly. The River Ranch is an amazing event, and this one will be huge. I'm hoping...


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  12. #12
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    From what I've read and heard...

    Quote Originally Posted by Scream And Fly
    an amazing event, and this one will be huge. I'm hoping...
    I agree.
    The makings of one of the really special events. Great guys running the show.
    Gary

  13. #13
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    I had those codes on a 97 4.0 ranger a few years ago. Turned out to be an intake leak.

  14. #14
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    Interesting.

    Quote Originally Posted by SteveO
    I had those codes on a 97 4.0 ranger a few years ago. Turned out to be an intake leak.
    Guess I know where to look.

  15. #15
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    Mass air sensor on air horn has to star type screws mark if not marked and count turns out lift out sensor and see if there is any dust dirt, a little will cause the light to be on. They make a cleaner spray it and the base. put the screw back in disconnect battery 45 minutes connect and see if light returns. Rick
    if that does not work take to cold beers and put tape over the light

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