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Running lean intermittently

Discussion in 'SVT Shelby GT500' started by bfoos59, Nov 8, 2018.

  1. bfoos59

    bfoos59 New Member Established Member

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    May 22, 2009
    Location:
    Plattsmouth, NE
    my 07 GT500 keeps throwing 171 and 174 codes—not all the time but intermittently. I’ve cleaned the MAF sensor, but that doesn’t help. Suggestions?
     
  2. merkyworks

    merkyworks Active Member Established Member

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    Houston
    clogged or faulty injector?
     
  3. fullboogie

    fullboogie Well-Known Member Established Member

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    Original O2 sensors?
     
  4. Sielmo

    Sielmo Active Member Established Member

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    I've been doing some homework myself as well. Could be a few things but start with the obvious and what was modified/messed with last. Evap components, fuel pressure reg, are not off the list but further down.
     
  5. gtt500

    gtt500 Member Established Member

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    ma
    What cold air intake, supercharger and hood are you using?
     
  6. gimmie11s

    gimmie11s Dont be a Hybred Premium Member Established Member

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    so cal
    What do the plugs look like? Is the car stock? Mods?

    Nowhere near enough info provided to help you.
     
  7. 2011 gtcs

    2011 gtcs GT500 poster Premium Member

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    You probably have a air leak after the MAF somewhere.
     
  8. VNMOUS1

    VNMOUS1 Well-Known Member Established Member

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    Eustis, FL
    Look at your short term fuel trims. Less than 10 pct correction? Less than 5 pct bank to bank disparity? Then it's unlikely that you have a configuration/equipment problem.

    As your tuner to look at the logs.

    Sent from my SM-N950U using the svtperformance.com mobile app
     

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