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Thread: New HEXV2 user + CHPA 1.4TSI misfire issue

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    New HEXV2 user + CHPA 1.4TSI misfire issue

    Hi,

    For 2 weeks I have a new Hex-V2 and plying around. Idea was to investigate why I had misfires. Last months, I noticed light shocking engine during driving the first 1-2minutes in the cold morning. Only with dsg in 1st gear and between 1500-2000 rpm. Sometimes it takes effort to get the engine to do this, and when I keep going and hold the throttle steady, sometimes CEL goes on. However, also without CEL, I know when I read DTC I see misfires. And I was right.

    Skoda Octavia 1.4TSI CHPA 2014 140 pk/bhp & 250Nm
    Engine+DSG7 tuned in September 2018, 190bhp &340Nm

    Code:
    Address 01: Engine       Labels: 04E-907-309-V1.CLB
    Control Module Part Number: 04E 906 016 G    HW: 04E 907 309 A
      Component and/or Version: 1,4l R4 TSI   X08 5761
               
    4 Faults Found:
    
    10203 - Random/Multiple Cylinder Misfire Detected 
              P0300 00 [039] - -
              Not Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 131397 km
                        Date: 2019.01.30
                        Time: 07:35:40
    
                        Engine speed: 1925.50 /min
                        Normed load value: 14.9 %
                        Vehicle speed: 13 km/h
                        Coolant temperature: 11 °C
                        Intake air temperature: 2 °C
                        Ambient air pressure: 980 mbar
                        Voltage terminal 30: 14.536 V
                        Unlearning counter according OBD: 80
                        Oxygen sensor bank 1 sensor 1: specified value: 0.9688
                        Oxygen sensor 2 bank 1 internal resistance limit value: 131068 Ohm
                        Long-term fuel trim bank 1 at idle: -0.09 %
    
    10591 - Cylinder 1 
              P0301 00 [039] - Misfire Detected
              Not Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 131397 km
                        Date: 2019.01.30
                        Time: 07:35:51
    
                        Engine speed: 1956.50 /min
                        Normed load value: 14.1 %
                        Vehicle speed: 13 km/h
                        Coolant temperature: 15 °C
                        Intake air temperature: 2 °C
                        Ambient air pressure: 980 mbar
                        Voltage terminal 30: 14.583 V
                        Unlearning counter according OBD: 80
                        Misfire recognition reference moment: 11.469 %
                        Misfire sum counter: 205
                        Counter: implaus. short-term adapt. values: misfire detection: 0
    
    10593 - Cylinder 3 
              P0303 00 [039] - Misfire Detected
              Not Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 131397 km
                        Date: 2019.01.30
                        Time: 07:35:51
    
                        Engine speed: 1956.50 /min
                        Normed load value: 14.1 %
                        Vehicle speed: 13 km/h
                        Coolant temperature: 15 °C
                        Intake air temperature: 2 °C
                        Ambient air pressure: 980 mbar
                        Voltage terminal 30: 14.583 V
                        Unlearning counter according OBD: 80
                        Misfire recognition reference moment: 11.469 %
                        Misfire sum counter: 205
                        Counter: implaus. short-term adapt. values: misfire detection: 0
    
    10592 - Cylinder 2 
              P0302 00 [039] - Misfire Detected
              Not Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 2
                        Fault Frequency: 1
                        Mileage: 131397 km
                        Date: 2019.01.30
                        Time: 07:35:51
    
                        Engine speed: 1956.50 /min
                        Normed load value: 14.1 %
                        Vehicle speed: 13 km/h
                        Coolant temperature: 15 °C
                        Intake air temperature: 2 °C
                        Ambient air pressure: 980 mbar
                        Voltage terminal 30: 14.583 V
                        Unlearning counter according OBD: 80
                        Misfire recognition reference moment: 11.469 %
                        Misfire sum counter: 205
                        Counter: implaus. short-term adapt. values: misfire detection: 0
    
    Readiness: 0000 0000
    Misfires occur on cylinders 1,2,3,4. The tuner said; first put new sparkplugs & ignition coils + fual with RON 98. So, I replaced these plugs&coils (all BERU) in December 2018. Not solved. I am fueling octane/RON 95. Yesterday I changed to RON 98. I report back if this results in less misfires.

    Logs with vcds (sorry if not all the measurements are useful). I only have adv.meas and I have no:
    RFP_AV (bypass valve %)
    IGA_AD_KNK[5] (in degrees; knock detection/timing pulled on cylinder)

    I think these have different names in my engine/vcds:
    Bypass valve f high press turboch turbine inlet: actual value
    Test of knock sensors: short trip result-Test_Program_Channel 165 (not sure)

    Performance log run in gear3 dsg-manual (I forgot Turbo-sampling):
    https://log.malonetuning.com/chart/2...bCqAAAAA%3D%3D

    (click Graph – Cycle bottom axis; to get Time instead of RPM). This one to be sure turbo, air, boost etc. are not suspicious.) Does this one looks OK?

    Log of a normal trip with count of misfires. Note on cyl 2 and 3 there are the most:
    https://log.malonetuning.com/chart/2...tfcQTDl8O0AAAA

    Log of a normal trip with:
    Coolant temperature
    Median injection timing
    Exhaust temperature 1 bank 1
    Fuel high pressure: actual value
    Ignition timing adjustment cylinder 1
    Correction factor injector cylinder 1-2-3
    https://log.malonetuning.com/chart/2...rCrQAAAA%3D%3D

    Maybe somebody can help solving the misfire issue. If RON 98 fuel will not help, the second step is walnut cleaning the intake and valves. With a mini camera I noticed light carbon buildup. Some say this can also be the reason. Airfilter, oil+filter is renewed last week.

    If I need to make more/other logs/vcds readings, let me know!

    Br,
    Philippe
    The Netherlands
    Last edited by Uwe; 01-30-2019 at 09:42 AM. Reason: CODE tags

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    Benevolent Dictator Uwe's Avatar
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    First thing I would do is return ECU software back to stock to see whether the tune has any effect here.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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    Quote Originally Posted by Uwe View Post
    First thing I would do is return ECU software back to stock to see whether the tune has any effect here.

    -Uwe-
    That was indeed my first thought, but, since I have to drive about 2.5 hours (single trip) to get to the tuner, it is not that easy decision.
    And then, being there, ECU back to stock, probably I cannot test it because the engine has to be “morning-cold”.
    So then I have to turn home, and some day, again go to the tuner to get something flashed. 4x 2,5 hours driving, at least.

    You get my point. And the tuner says; we edit parameters from 2000 rpm, so it is no way it can be the software… But I understand your point ��

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    Verified VCDS User PetrolDave's Avatar
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    Quote Originally Posted by prosier View Post
    And the tuner says; we edit parameters from 2000 rpm, so it is no way it can be the software…
    How many times have we heard on here an owner say "the tuner said it can't be my tune"? To answer my own question, so many times I've lost count...

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    VCDS Distributor Mike@Gendan's Avatar
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    Quote Originally Posted by prosier View Post
    Quote Originally Posted by Uwe View Post
    First thing I would do is return ECU software back to stock to see whether the tune has any effect here.

    -Uwe-
    That was indeed my first thought, but, since I have to drive about 2.5 hours (single trip) to get to the tuner, it is not that easy decision.
    And then, being there, ECU back to stock, probably I cannot test it because the engine has to be “morning-cold”.
    So then I have to turn home, and some day, again go to the tuner to get something flashed. 4x 2,5 hours driving, at least.

    You get my point. And the tuner says; we edit parameters from 2000 rpm, so it is no way it can be the software… But I understand your point ��
    Let me get this straight - this fault has only happened since the remap, and the basic fixes haven't worked?

    So you're willing to drive 2.5 hours to get an unnecessary tuning job done on the car, but you're not willing to do the same journey again for a necessary trip to check whether the work they have done to squeeze out an extra 35% more power is causing the problem and potentially damaging your engine?

    Quote Originally Posted by PetrolDave View Post
    How many times have we heard on here an owner say "the tuner said it can't be my tune"? To answer my own question, so many times I've lost count...
    I used to own an Impreza and regularly read one of the big Subaru forums (Scoobynet).
    It always amused/amazed me when people would blame Subaru's "crappy reliability" when their engine went pop while running 30 or 40% more boost than stock...
    Apparently I should put something witty or profound in here...

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  9. #6
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    Did you refuel with RON98 before the tuner did his work? Most, if not all, tuners recommend RON98 for tuning (best results). If the remap is done on RON98, it's not strange that the car can behave different when it is refueled with RON95.

    Where are you from in the Netherlands? Lots of tuners, so there should be one in you neighbourhood
    Golf VII, 1.6TDI BM Ed. 40 - 110 PK

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    Quote Originally Posted by Mari View Post
    Did you refuel with RON98 before the tuner did his work? Most, if not all, tuners recommend RON98 for tuning (best results). If the remap is done on RON98, it's not strange that the car can behave different when it is refueled with RON95.

    Where are you from in the Netherlands? Lots of tuners, so there should be one in you neighbourhood

    I refuel always with ron95. Also before tuning. Also during tuning. However these misfires only occur when cold, slow driving in dsg manual in 1st, under 2000 rpm. So it is not noticed during tuning.
    However I don't know if they specially changed something for ron95 or 98. But when I reported the issue to them, they said:
    - first renew sparks plugs and ignition coils
    - then 2 times refuel with 98
    - if it is still misfiring, come to us to make the ecu stock again. But they doubt if it is their tuning.

    However, other enthusiasts here say; common problem with tsi engines in low rpm; let the intake+valves clean with walnut blasting. And I went to Belgium for this tuning because of the good reviews and more attractive price. They have a good reputation, so I would not go to any tuning that is doing crap

    Pics of valves and piston:
    https://www.dropbox.com/s/3vsc12z67k...54-41.jpg?dl=0
    https://www.dropbox.com/s/v7j00ntpeq...09-32.jpg?dl=0
    https://www.dropbox.com/s/mx7b8h43p2...36-30.jpg?dl=0
    https://www.dropbox.com/s/ue4ogtw07e...17-70.jpg?dl=0
    https://www.dropbox.com/s/q38g0t2jur...39-21.jpg?dl=0
    https://www.dropbox.com/s/tw4nswjbuh...02-20.jpg?dl=0

    So this 'could' be the problem, but they say it is not extreme.

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    I know a few tuners with good reviews and good reputation, so no need to go to Belgium...
    Golf VII, 1.6TDI BM Ed. 40 - 110 PK

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    Verified VCDS User felis_manul's Avatar
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    Just curious, were there any conclusions on this case? Was the issue root cause found?
    Octavia III

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    Hi,
    Well it happened not a lot anymore. Also due the carbon cleaning I think.

    Next winter I have to check again with colder temperatures. So far I am going OK now. No more check engine lights.

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