p0171 P1011 Rough Idle when Temps below freezing. HELP
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Thread: p0171 P1011 Rough Idle when Temps below freezing. HELP

  1. #1
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    p0171 P1011 Rough Idle when Temps below freezing. HELP

    2011 chevy cruze eco 135,000 milesSo I took my car to the shop and got a smoke test for the p0171 code and +22 LTFT, They found the PCV leaking. My wife went and told them to replace it ( I was sleeping SMH) well $270 later. (it makes me sick over a $48 part I could of did in my sleep). I get the car back. I drive it home around 45 Degrees out, LTFT is staying around 0 to +7. I start it after work, Temps in the 20s it idles like crap, and almost stalls twice. LTFT was at +32 and a pending p0171 code. Drove it home, LTFT was staying around +7, idle after warm up around +6. Got home, tried to see if there was another air leak, I cant find one, after messing around it set of a p1011 code, Im not sure if it was from me. It set off that code once before, but when I reset it it never came back just the p0171. Does anyone know correct MAF readings on the cruze?And any ideas on my Rough idle only on a Very cold temp start, and high LTFT still after pcv was changed?PS Manisfold does have the orange check valve present.

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    Freeze frame report generated by Torque for Android
    ================================================== =======

    Vehicle Manufacturer: Chevrolet
    Vehicle Calibration ID: 126

    Freeze frame information:
    ------------------
    Fuel Status = 0 byte
    Engine Load = 70.98 %
    Engine Coolant Temperature = 219.2 °F
    Fuel Trim Bank 1 Short Term = 0 %
    Fuel Trim Bank 1 Long Term = 33.594 %
    Fuel pressure = 61.351 psi
    Intake Manifold Pressure = 17.695 psi
    Engine RPM = 2,132 rpm
    Speed (OBD) = 68.972 mph
    Timing Advance = 2.5 °
    Intake Air Temperature = 48.2 °F
    Mass Air Flow Rate = 30.15 g/s
    Throttle Position(Manifold) = 50.98 %
    Run time since engine start = 419 s
    Fuel Level (From Engine ECU) = 90.196 %
    Distance travelled since codes cleared = 23.612 miles
    Evap System Vapour Pressure = 0.25 Pa
    Barometric pressure (from vehicle) = 14.504 psi
    Catalyst Temperature (Bank 1,Sensor 1) = 1,520.6 °F
    Voltage (Control Module) = 14.467 V
    Engine Load(Absolute) = 103.922 %
    Commanded Equivalence Ratio(lambda) = 1
    Relative Throttle Position = 37.647 %
    Ambient air temp = 44.6 °F
    Absolute Throttle Position B = 50.196 %
    Accelerator PedalPosition D = 38.824 %
    Accelerator PedalPosition E = 19.216 %


    End of report.

  4. #3
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    Anything that sticks out besides fuel trim?
    P0171 was set

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  6. #4
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    Fuel pressure seems a little high, but then again it appears the throttle was at 50%.

    I'm guessing a vacuum leak somewhere. Maybe smoke machine it? (side note, I'm chasing an unusually high LTFT myself and am in the process of making a homemade smoke machine )

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    How are you making it? I Tried with a hose and a Cigar ( Its rough living in an apartment) But I couldn't see anything. But I did enjoy the cigar. Fuel Pressure is around 48 most of the time. I must of been going up a hill on the highway when it actually set.
    mikestony likes this.

  8. #6
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    Quote Originally Posted by unitednations161 View Post
    How are you making it? I Tried with a hose and a Cigar ( Its rough living in an apartment) But I couldn't see anything. But I did enjoy the cigar. Fuel Pressure is around 48 most of the time. I must of been going up a hill on the highway when it actually set.
    I'm making it out of an empty paint can following the instructions from here:
    Make Your Own Smoke Machine - E46Fanatics

    with some slight changes
    There are also many YouTube videos about it too.

    Fuel pressure is the same for me too.

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    Well if I don't get to it until I go back home, let me know what is leaking on your car.
    mikestony likes this.

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    Quote Originally Posted by mikestony View Post
    I'm making it out of an empty paint can following the instructions from here:Make Your Own Smoke Machine - E46Fanaticswith some slight changes There are also many YouTube videos about it too.Fuel pressure is the same for me too.
    alright thank you

  11. #9
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    Quote Originally Posted by unitednations161 View Post
    Well if I don't get to it until I go back home, let me know what is leaking on your car.
    Will do

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