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Prius 2011 with 29MPG trouble!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by MomaniSM, Aug 14, 2018.

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  1. MomaniSM

    MomaniSM Junior Member

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    Hi folks

    I have recently my Prius 2011 (100 mile) dropped mileage from 38 to 30 and sometimes 28 mpg !
    nothing hase been changed since the last month niether the oil :)
    I have techstream with MVCI cable (obdc to USB) cable and can connect to ECU to change some customization setting like buzzer, alarm, security alarm and so on.
    I tested batary blocks voltage using batary drain and showing no issue on any cell, and while driving batary showing very good level at all times.
    I dont have check engine light one, but I feel the problem is with gas engine, i might be the sparks (lately changed on 80k mile), or sensors (fule, intake air, ... etc).
    Here comes my question: is there a parameter/setting file or a guide for techstream application to read all performance counters and compare it with normal range to report the issue.
     
    #1 MomaniSM, Aug 14, 2018
  2. bisco

    bisco cookie crumbler

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    have you checked all the usual suspects, air filter, tires and pressure, etc.?
     
    #2 bisco, Aug 14, 2018
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  3. Jkan2001

    Jkan2001 Member

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    Bet it's the 12V gone bad, test it when the car has been parked a while. Nothing else would cause that drastic of a drop.
     
    #3 Jkan2001, Aug 15, 2018
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  4. sam spade 2

    sam spade 2 Senior Member

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    The onboard computers are doing that......all the time.
    If they see a problem, a light lites and a code is set.
    But they can't see EVERYTHING.
    In addition to what was already mentioned, a dragging brake can kill your gas mileage.
    So can a failing 12 V battery.
     
    #4 sam spade 2, Aug 15, 2018
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  5. MomaniSM

    MomaniSM Junior Member

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    Sure, today i smell fule from exhaust after engine started

    Posted via the PriusChat mobile app.
     
    #5 MomaniSM, Aug 22, 2018
  6. MomaniSM

    MomaniSM Junior Member

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    Breack check and tires run freely, 12 v battary... I will change it and report, what Amp to choose for the new battery

    Posted via the PriusChat mobile app.
     
    #6 MomaniSM, Aug 22, 2018
  7. sam spade 2

    sam spade 2 Senior Member

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    Batteries can be tested. No need to change it blindly.......unless maybe if it is 7 years old or more.
    If you do need a new battery, you should get one that is made for THAT car.
    The size needs to be right, as well as the type of posts.

    BUT.....if you are smelling raw gas from the exhaust, that likely means that there is a problem with the fuel system.
    Maybe an injector or two stuck partially open.
    This may require the services of a mechanic.
     
    #7 sam spade 2, Aug 23, 2018
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  8. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Is "JO" Jordan? No offense, but it's a struggle deciphering acronyms sometimes.

    How many miles does the car have, on the odometer?

    What kind of driving are you doing typically?

    I assume no warning lights?
     
    #8 Mendel Leisk, Aug 23, 2018
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  9. MomaniSM

    MomaniSM Junior Member

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    How to test battery?, I have multimeter, and it showing 12.3 today morning after overnight idle; is that good?
    For the stucked injectors, I suppose that will fire a warning light right? but no light showing on the dash.
     
    #9 MomaniSM, Aug 24, 2018
    Last edited by a moderator: Aug 24, 2018
  10. MomaniSM

    MomaniSM Junior Member

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    Yes dear, JO is Jordan country in the middle east, the car having 104K mile and no warning lights on my dash.
    driving conditions ... i think it is hard to classify, it is all city drive in Amman, but Amman city having many hills and mountains in addition to heavy traffic ... but I used to have ~40mpg, my friend having 45mpg, and some guys reported 50mpg

    HV battary tested and all cells reported consistant voltages (discharge test)
     
    #10 MomaniSM, Aug 24, 2018
  11. MomaniSM

    MomaniSM Junior Member

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    Vehicle:
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    Model:
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    My test results
    Mode $06 report generated by Torque for Android
    ================================================

    Vehicle VIN: Not present
    Vehicle Manufacturer: Unknown
    Vehicle Calibration ID: Not present

    Test report:
    ------------------
    MID:$01 TID:$91
    - O2 Bank 1 Sensor 1
    Max: 2.18359mA Min: 0.70312mA
    Test result value: 1.46094mA
    PASS
    ----
    MID:$01 TID:$93
    - O2 Bank 1 Sensor 1
    Max: 3.99757V Min: 0.03697V
    Test result value: 0.09943V
    PASS
    ----
    MID:$01 TID:$94
    - O2 Bank 1 Sensor 1
    Max: -0.04014V Min: -3.9977V
    Test result value: -0.07674V
    PASS
    ----
    MID:$01 TID:$95
    - O2 Bank 1 Sensor 1
    Max: 343ms Min: 0ms
    Test result value: 0ms
    PASS
    ----
    MID:$02 TID:$08
    Maximum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
    Max: 1.19V Min: 0.585V
    Test result value: 0.664V
    PASS
    ----
    MID:$02 TID:$8b
    - O2 Bank 1 Sensor 2
    Max: 998ms Min: 0ms
    Test result value: 49ms
    PASS
    ----
    MID:$02 TID:$8d
    - O2 Bank 1 Sensor 2
    Max: 5,995ms Min: 0ms
    Test result value: 1,605ms
    PASS
    ----
    MID:$02 TID:$8f
    - O2 Bank 1 Sensor 2
    Max: 2.0984 Min: 0
    Test result value: 0.17934
    PASS
    ----
    MID:$21 TID:$a9
    - Catalyst Monitor Bank 1
    Max: 9.99393 Min: 0.24979
    Test result value: 0.26657
    PASS
    ----
    MID:$31 TID:$bd
    - EGR Monitor Bank 1
    Max: 655.34998kPa Min: 0.8kPa
    Test result value: 16.17kPa
    PASS
    ----
    MID:$35 TID:$81
    -
    Max: 9,490ms Min: 0ms
    Test result value: 0ms
    PASS
    ----
    MID:$3d TID:$c9
    - EVAP Monitor (0.020")
    Max: 32.767kPa Min: 0kPa
    Test result value: 0.308kPa
    PASS
    ----
    MID:$3d TID:$ca
    - EVAP Monitor (0.020")
    Max: 32.767kPa Min: 0kPa
    Test result value: 2.552kPa
    PASS
    ----
    MID:$3d TID:$cb
    - EVAP Monitor (0.020")
    Max: 32.767kPa Min: 0kPa
    Test result value: 1.804kPa
    PASS
    ----
    MID:$3d TID:$cd
    - EVAP Monitor (0.020")
    Max: 32.767kPa Min: 0kPa
    Test result value: 1.804kPa
    PASS
    ----
    MID:$42 TID:$91
    - O2 Heater Monitor Bank 1 - Sensor 2
    Max: 33,214mOhm Min: 0mOhm
    Test result value: 24,565mOhm
    PASS
    ----
    MID:$81 TID:$81
    - Fuel System Monitor Bank 1
    Max: 0.04596 Min: 0
    Test result value: 0.01025
    PASS
    ----
    MID:$81 TID:$82
    - Fuel System Monitor Bank 1
    Max: 0.499 Min: -32.768
    Test result value: 0.089
    PASS
    ----
    MID:$a1 TID:$0b
    EWMA Misfire counts (average) for last 10 drive cycles - Misfire Monitor General Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a1 TID:$0c
    Misfire counts for last/current driving cycles(calculated) - Misfire Monitor General Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a2 TID:$0b
    EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 1 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a2 TID:$0c
    Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 1 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a3 TID:$0b
    EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a3 TID:$0c
    Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a4 TID:$0b
    EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 3 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a4 TID:$0c
    Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 3 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a5 TID:$0b
    EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 4 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$a5 TID:$0c
    Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 4 Data
    Max: 65,535Count Min: 0Count
    Test result value: 0Count
    PASS
    ----
    MID:$f0 TID:$12
    Manufacturer defined MID -
    Max: 45,016 Min: 6,472
    Test result value: 65,520
    FAIL
    ----


    End of report.

    Posted via the PriusChat mobile app.
     
    #11 MomaniSM, Sep 3, 2018
  12. bisco

    bisco cookie crumbler

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    12.3 is low, start by replacing it, then move on to more complicated things if the mpg doesn't come up.
    best way to buy a 12v battery is to find a seller that matches it to a 2011 prius. otherwise, you might have fitment issues, cross polarization or vent tube problems.

    that being said, a 2011 with 100k needs an intake and egr circuit cleaning, and an oil catch can f you can manage it.
     
    #12 bisco, Sep 3, 2018
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  13. MomaniSM

    MomaniSM Junior Member

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    Battery changed, mpg now 32, i need to proceed with other, EGR clean, but what is oil catch can, is it the same of cleaning the engine from inside using engine cleaning fluids

    Posted via the PriusChat mobile app.
     
    #13 MomaniSM, Sep 4, 2018
  14. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    An oil catch can is a container with with air inlet and outlet, and a labyrinth of some sort. The idea is to take in air with oil-mist, and capture the oil portion, just allow the air to exit. You need to periodically empty it of the oil/water/gas it accumulates.

    It's typically spliced into the hose between Positive Crankcase Ventilation valve (mounted on the crankcase side wall) and the intake manifold. The object is to reduce the oil mist being dumped into the intake manifold.
     
    #14 Mendel Leisk, Sep 4, 2018
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  15. bisco

    bisco cookie crumbler

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    see the thread 'oil catch can, eliminate that knock' by @danlatu
     
    #15 bisco, Sep 4, 2018
    Last edited: Sep 4, 2018
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  16. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    #16 Mendel Leisk, Sep 4, 2018
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  17. bisco

    bisco cookie crumbler

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    thanks!
     
    #17 bisco, Sep 4, 2018
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  18. mjoo

    mjoo Senior Member

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    A clean EGR system and intake are definitely important for fuel economy.

    There are also reports of fuel pumps failing sometime after 100k. They begin with worse fuel economy. What happens is the fuel pressure is too low to properly spray and vaporize the fuel. So some fuel escapes without being burned in the engine.

    There is a schrader valve that you can connect a gauge to and check the fuel pressure.

    Pixel XL ?
     
    #18 mjoo, Sep 4, 2018
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  19. Raytheeagle

    Raytheeagle Senior Member

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    Where’s the schrader valve located?
     
    #19 Raytheeagle, Sep 5, 2018
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  20. MomaniSM

    MomaniSM Junior Member

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    Can we find the fule pressure using techstream, and what shold a good reading is?

    Posted via the PriusChat mobile app.
     
    #20 MomaniSM, Sep 5, 2018
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