14 Cruze ECO seems to automatically accelerate and decelerate
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Thread: 14 Cruze ECO seems to automatically accelerate and decelerate

  1. #1
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    14 Cruze ECO seems to automatically accelerate and decelerate

    Daughter says the it keeps doing this in an almost jerking manner.

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    Drove it from the house to both ends of Rosamond Blvd (little over 75 miles), to AutoZone, got new codes, and home. Didn't have any issues like my daughter had described, but the codes were for either dirty or fouled fuel injector (running lean to super lean), so I bought some injector cleaner. I may have either a fuel injector or fuel filter change in the near future.
    Chris

    2014 Cruze Eco - Limo-tint (back doors, rear window, & top of windshield), blacked out bowties

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    I'm not sure what code you got, but running lean could also mean a vacuum leak - unmetered air getting into the system. Perhaps the dreaded PCV system acting up.

    Edit: If air somehow gets into the system and IS metered, it will likely be sensed as an uncommanded acceleration. More air & metered = more fuel. More air + more fuel = acceleration.
    More air & not metered = runs lean.
    Last edited by ChevyGuy; 03-25-2019 at 11:29 PM.
    '13 LTZ

    Prior rides:
    '89 Corsica LT Hatchback 2.8L/Auto
    '67 Chevy II, 250 ci/auto

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    Quote Originally Posted by ChevyGuy View Post
    I'm not sure what code you got, but running lean could also mean a vacuum leak - unmetered air getting into the system. Perhaps the dreaded PCV system acting up.
    There were 3 or 4 different codes on the printout, and AZ's computer said it was the FI. But I'll keep an eye out for a vacuum leak.
    Chris

    2014 Cruze Eco - Limo-tint (back doors, rear window, & top of windshield), blacked out bowties

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    Do you have the codes? If so, you can compare them to what others have experienced here.
    obermd and Ravenkeeper like this.
    '13 LTZ

    Prior rides:
    '89 Corsica LT Hatchback 2.8L/Auto
    '67 Chevy II, 250 ci/auto

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    Yes please post them.
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    Quote Originally Posted by ChevyGuy View Post
    Do you have the codes? If so, you can compare them to what others have experienced here.
    Quote Originally Posted by Blasirl View Post
    Yes please post them.
    I was going to post them anyways, but I didn't have them at work with me.

    The codes are as follows:
    P0171: System too lean (Zone 1)
    P0106: Manifold Absolute Pressure/BARO Sensor Range/Performance
    P015B: O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1
    P0507: Idle Air Control System RPM Higher Than Expected
    P1101: Intake Air Flow System Performance
    Chris

    2014 Cruze Eco - Limo-tint (back doors, rear window, & top of windshield), blacked out bowties

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    A code P0171 may mean that one or more of the following has happened:

    The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor
    Possible cracked vacuum or PCV line/connection
    Faulty or stuck open PCV valve
    Failed or faulty oxygen sensor (bank 1, sensor 1)
    Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!)
    Exhaust leak between engine and first oxygen sensor


    Read more at: https://www.obd-codes.com/p0171



    A P0106 could be caused by:

    Bad MAP sensor Water/dirt intrusion affecting MAP sensor connector
    Intermittent open in the reference, ground, or signal wire for the MAP sensor
    Intermittent short in the reference, ground, or signal wire for the MAP sensor
    Ground problem due to corrosion causing intermittent signal problem
    A break in the flexible air intake duct between the MAF and the intake manifold
    Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)


    Read more at: https://www.obd-codes.com/p0106



    Potential causes for code P015B to set are:

    Defective O2 sensor(s)
    Burnt, broken, or disconnected wiring and/or connectors
    Defective catalytic converter
    Engine exhaust leaks


    Read more at: https://www.obd-codes.com/p015b


    A P0507 DTC trouble code may be caused by one or more of the following:

    A vacuum leak Leaking air intake after the throttle body
    EGR valve leaking vacuum
    A faulty positive crankcase ventilation (PCV) valve
    Damaged/failed/dirty throttle body
    Failed EVAP system
    Failed IAC (idle air controller) or faulty IAC circuit


    Read more at: https://www.obd-codes.com/p0507




    For P1101 read more here: https://www.700r4transmissionhq.com/...e-codes/#P1101



    And read this as well as watch the video:

    2011-2016 Cruze 1.4 PCV Valve Cover/Intake Manifold Issues

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    Quote Originally Posted by Blasirl View Post
    A code P0171 may mean that one or more of the following has happened:
    The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor
    Possible cracked vacuum or PCV line/connection
    Faulty or stuck open PCV valve
    Failed or faulty oxygen sensor (bank 1, sensor 1)
    Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!)
    Exhaust leak between engine and first oxygen sensor

    Read more at: https://www.obd-codes.com/p0171


    A P0106 could be caused by:
    Bad MAP sensor Water/dirt intrusion affecting MAP sensor connector
    Intermittent open in the reference, ground, or signal wire for the MAP sensor
    Intermittent short in the reference, ground, or signal wire for the MAP sensor
    Ground problem due to corrosion causing intermittent signal problem
    A break in the flexible air intake duct between the MAF and the intake manifold
    Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)

    Read more at: https://www.obd-codes.com/p0106


    Potential causes for code P015B to set are:
    Defective O2 sensor(s)
    Burnt, broken, or disconnected wiring and/or connectors
    Defective catalytic converter
    Engine exhaust leaks

    Read more at: https://www.obd-codes.com/p015b


    A P0507 DTC trouble code may be caused by one or more of the following:
    A vacuum leak Leaking air intake after the throttle body
    EGR valve leaking vacuum
    A faulty positive crankcase ventilation (PCV) valve
    Damaged/failed/dirty throttle body
    Failed EVAP system
    Failed IAC (idle air controller) or faulty IAC circuit

    Read more at: https://www.obd-codes.com/p0507


    For P1101 read more here: https://www.700r4transmissionhq.com/...e-codes/#P1101

    And read this as well as watch the video:

    2011-2016 Cruze 1.4 PCV Valve Cover/Intake Manifold Issues
    That I know of, air filter is whatever the dealership put in, guess I'll have to look at it, soon.

    I had to disconnect the MAPS and the upper O2 Sensor, to move the air inlet out of the way, to replace the Water Outlet Housing (leaking). Had P0171 shortly after changing WOH, so I've check the connections on those, may have to spray some contact cleaner.
    Chris

    2014 Cruze Eco - Limo-tint (back doors, rear window, & top of windshield), blacked out bowties

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    Ran one bottle of Chevron Injector Cleaner through with just over 1/2 tank of gas. Electrically disconnected, cleaned, & reconnected MAPS and the upper O2 Sensor. A friend came over, reset CEL/Codes. Daughter drove to school, and said that she got about 10 miles away, when the CEL came ON again.

    NEW codes are as follows:
    P0171: System too lean (Zone 1)
    P1101: Intake Air Flow System Performance

    Ordered a new valve cover, should be here on Wednesday/Thursday, and will be replacing it on Saturday.
    Chris

    2014 Cruze Eco - Limo-tint (back doors, rear window, & top of windshield), blacked out bowties

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