Skoda Octavia 2014: 1.4TSI misfires cold start log vcds

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

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. It is possible the misfires occurred also before the tuning, I could not test/have not noticed this. It started during cold weather. The tuner said; first put new sparkplugs & ignition coils + fuel 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/24639...

(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/24640...

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/24641...

This looks strange to me (but possible this behavior is normal…):
https://www.dropbox.com/s/6hpg9drf2g95tq...

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