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code PO171 V70-XC70 2004

posted by  someone claiming to be Art on  Mon Jul 29 14:49 CST 2013 [RELATED]

I have about 155K on a 2004 V70. I got an engine check light several months ago, but it disappeared before I could check for fault codes. It's back and the only code identified is "PO171". I have googled it and read other sites and the Brickboard, but I do not have a clear picture of where to begin with the 2004(most comments were for earlier cars?).
I have check, there seems to be no backpressure from the crankcase when checked at the dipstick or oil fill cap. The car runs and accelerates smoothly.
I would appreciate any other guidance in chasing the possibilities down to a solution.
Thx.
Art








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    code PO171 V70-XC70 2004

    posted by  KlausC on  Tue Jul 30 10:08 CST 2013
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Type of engine does matter, NA or turbo. Both engines will develop vacuum leaks after 10 years, resulting in a 'lean' condition.

    The oil dipstick check is for vacuum and can only be reliable if the light pressure is attempting to inflate a finger on a latex glove covering the tube.

    Best is checking a vacuum line at the intake manifold with a vacuum gauge, as it should read around 17psi negative at idle with a warm engine.

    Read this thread completely:

    http://forums.swedespeed.com/showthread.php?145137-P0171-System-Too-Lean
    --
    Klausc, a Volvoholic








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      code PO171 V70-XC70 2004

      posted by  someone claiming to be Art on  Tue Jul 30 13:50 CST 2013 [RELATED]

      Thanks Claus. I will follow up on the guidance provided. The engine is the non-turbo. This AM the engine light was out, but came back after a stop and re-start. I looked to see where I could connect a Vac gage and noticed one of the small vac lines to the air intake filter box was broken off at the engine intake manifold.. I fixed that.
      In trouble-shooting, when the problem is corrected will the engine light go out or does something have to be re-set??
      Art








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        code PO171 V70-XC70 2004

        posted by  KlausC on  Tue Jul 30 18:13 CST 2013
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        That is a perfect vacuum leak. The light should go off after a couple of engine cycles. Or, go to a parts store and have them clear the codes.
        --
        Klausc, a Volvoholic







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