2012 Touareg TDI - Very rough idle and odd deviations

[andrePNW]

Hello all!

Rig was running fine yesterday, and I went to start it this morning to an extremely rough idle/misfire nothing I've experienced before. Revved a bit to help warmup and it was not happy.. No codes though
Whiteish exhaust as well, not sweet smelling or anything like that.

Ran an autoscan, and threw in some deviation data at the bottom which caught my eye. Curious on what everyone thinks..

For a quick catchup, over the past 3~ months i've replaced both lower intake manifolds, and the upstream pipe from the turbo to the aux cooler, and the tube from the aux to the egr itself as they've been cracked for sometime.

Saturday,24,August,2024,13:23:49:16709
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 24.7.0.0 (x64)  HEX-V2 CB: 0.4643.5
Data version: 20240715 DS356.3
www.Ross-Tech.com


VIN: WVGEK9BPXCDXXXXXX   License Plate:
Mileage: 256441km-159345mi   Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: BP-VW52 (7P6)
Scan: 01 02 03 05 08 09 15 16 17 19 2E 42 46 52 53 55 56 62 65 69
          6D 72 77 A7

VIN: WVGEK9BPXCDXXXXXX   Mileage: 256441km-159345miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
69-Trailer -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
A7-Infotain. Interface -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CATA)       Labels:. 059-907-401-V2.clb
   Part No SW: 7P0 907 401 J    HW: 7P0 907 401 E
   Component: 3.0TDI FSA    H17 0008
   Revision: 56H17---    CVN: 66FD96005C3E0D045C3E0D04
   Coding: 292A4012233600050000
   Shop #: WSC 04944 444 00000
   ASAM Dataset: EV_ECM30TDI0117P0907401J 002007
   ROD: EV_ECM30TDI0117P0907401J_002.rod
   VCID: 3632FFC168C369EAB5F-8062
   VINID: 9E65D56C94A0A1350000600818BF03F6F5

No fault code found.
Readiness: 0 0 0 1 1

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0C8-927-7XX-V1.clb
   Part No SW: 0C8 927 750 G    HW: 0C8 927 750 G
   Component: AL1000 AISIN  001 3407
   Serial number:                CVN: CB5A7D50
   Coding: 001368
   Shop #: WSC 99999 999 83333
   ASAM Dataset: EV_TCMAL991031 002112
   ROD: EV_TCMAL991031_002_VW52.rod
   VCID: 303EC9D98AA747DAEF3-8064

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:* 7P0-907-379.clb
   Part No SW: 7P0 907 379 J    HW: 7P0 907 379 A
   Component: MK25A         H36 0433
   Revision: --------    Serial number: 431410010EC010 Dataset Number: 7P0012v____ 7P16
   Coding: 5B7613C349242559DAF4C89B92D8A4407300
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_MK25AXT 008001
   ROD: EV_ESPMK25A00800.rod
   VCID: 44D695092E1FCB7A3BB-8010

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 BK    HW: 4H0 907 064 BK
   Component: BCM2 2.0      H31 0333
   Revision: 00002001
   Coding: 09860000000000000000
   Shop #: WSC 31414 790 00001
   VCID: 73B406D53BB13CC2521-8026

   Subsystem 1 - Part No SW: 7P6 959 754 M    HW: 7P6 959 754 M
   Component: FBSTOUAREGIDG  H04 0051
   Serial number: 0511000056876015

   Subsystem 2 - Part No SW: 4H0 905 852 B    HW: 4H0 905 852 B
   Component: J764 ELV MLB  H38 0044
   Serial number: 2311000232752010

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 7P6-907-040.clb
   Part No SW: 7P6 907 040 BR    HW: 7P6 907 040 BR
   Component: Klima 2 Zonen H21 1306
   Coding: B606200880
   Shop #: WSC 99999 1023 2097151
   ASAM Dataset: EV_AirCondiFront 004001
   ROD: EV_AirCondiFront_VW52.rod
   VCID: 0550480D65A532726C5-8050

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V1.clb
   Part No SW: 4H0 907 063 BD    HW: 4H0 907 063 D
   Component: BCM1 2.0      H12 0100
   Revision: 15012002    Serial number: 00000001299360
   Coding: 26001012973C5D010020180300005D0C431C660882010261000000020000
   Shop #: WSC 31414 790 00001
   VCID: 6B841EB56381E4029A1-803E

   Subsystem 1 - Part No SW: 7P0 955 119     HW: 7P0 955 119   Labels: 1KX-955-119.CLB
   Component: WWS    111031  31  0020
   Serial number: 90243400111109144928
   Coding: 004DBD

   Subsystem 2 - Part No SW: 7P0 955 559 D    HW: 7P0 955 559 D  Labels: 8K0-955-559.CLB
   Component: RLFS  H09 0011
   Serial number: 10269269        
   Coding: 025223

   Subsystem 3 - Part No SW: 7P6 941 431 E    HW: 7P6 941 431 E
   Component: E1 - LDS  H04 0031
   Serial number: 00000000000111110331

   Subsystem 4 - Part No SW: 4H0 907 410 A    HW: 4H0 907 410 A
   Component: USHL4.2  H30 0020
   Serial number: 0000001805569R0VQA07

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 7P0-959-655.clb
   Part No SW: 7P0 959 655 D    HW: 7P0 959 655 D
   Component: VW10Airbag02B H06 0026
   Revision: --------    Serial number: 003L5000B6RU Dataset Number: v00310737P6 1073
   Coding: 000000000000000000000000000000003242
   Shop #: WSC 54636 000 1048576
   ASAM Dataset: EV_AirbaVW10BPAVW526 001001
   ROD: EV_AirbaVW10BPAVW526_001.rod
   VCID: 42DA9311340BC54A097-8016

   Seat occupied recognition:
   Subsystem 1 - Part No SW: 7P6 959 339     HW: 7P6 959 339
   Component: BF-Gewichtss.  003 0005
   Serial number: 5850000R1172706HGL

   Crash sensor for side airbag: driver side:
   Serial number: 3575LRB405R0TGJG9ODQ

   Front Passenger's Side Airbag Crash Sensor:
   Serial number: 3585LRB40530U2UQ5OIC

   Rear Side Airbag Crash Sensor (on driver's side):
   Serial number: 3515RRB40530Q8K4817-

   Passenger side rear thorax airbag crash sensor:
   Serial number: 3525RRB40570Q8K4216Y

   Crash sensor for front airbag: driver side:
   Serial number: 3555NRB40650TO4M69DT

   Crash sensor for front airbag: front passenger side:
   Serial number: 3565NRB405V0TO4M3OQ.

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
   Part No SW: 4H0 953 568 F    HW: 7P6 953 507 L
   Component: Lenks.Modul   H03 0005
   Revision: --------    Serial number: 90815KKF00008
   Coding: 000015
   Shop #: WSC 31414 790 00001
   VCID: 3632FFC1684369EAB5F-8062

   Subsystem 1 - Part No SW: 7P6 959 542     HW: 7P6 959 542
   Component: E221__MFL-TAS  H03 0027
   Serial number: 0127302          

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 7P6-920-xxx-17.clb-SRI1
   Part No SW: 7P6 920 980 N    HW: 7P6 920 980 N
   Component: Kombi         H13 0239
   Revision: 11240062    Serial number: 658081111593026
   Coding: 8B6733022B00CF05020002
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_KombiUDSRBVW526 001013
   ROD: EV_KombiUDSRBVW526_VW52.rod
   VCID: 47CC82051F29E062DE9-8012

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:* None
   Part No SW: 7P6 907 530 B    HW: 7P6 907 530 B
   Component: Gateway-CAN-L H08 5202
   Revision: --------    Serial number: 00000000297606
   Coding: 0001037500
   Shop #: WSC 31414 790 00001
   GVL: FB0E42051E3B810000
   ASAM Dataset: EV_GatewVW526UDS 001006
   ROD: EV_GatewUDS_VW52.rod
   VCID: 372CF2C56FC990E2AE9-8062

   Battery Monitoring Control Module:
   Subsystem 1 - Part No SW: 7P0 915 181 A    HW: 7P0 915 181
   Component: Batt_Sensor  H07 0140
   Serial number: 00000000005650971482

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (J650)       Labels: None
   Part No SW: 7P6 035 342 C    HW: 7P6 035 342 C
   Component: SG EXT.PLAYER H13 0240
   Revision: A1001003    Serial number: 7661194764
   Coding: 010000
   Shop #: WSC 58559 000 1048576
   VCID: 3138CCDD812D4ED2E0D-8064

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
   Part No SW: 4H0 959 793 N    HW: 4H0 959 793 F
   Component: TSG FA        H07 0166
   Revision: --------    Serial number: 0000121954730
   Coding: 011D07200000453005080000
   Shop #: WSC 31414 790 00001
   VCID: 44D695092E9FCB7A3BB-8010

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
   Part No SW: 4H0 907 064 BK    HW: 4H0 907 064 BK
   Component: BCM2 2.0      H31 0333
   Revision: 00002001    Serial number: 0162983855
   Coding: 01861E3A28B9500080A00620210000000000000000000000000000000000
   Shop #: WSC 31414 790 00001
   VCID: 73B406D53BB13CC2521-8026

   Subsystem 1 - Part No SW: 7P6 959 719     HW: 7P6 959 719
   Component: GTO BT  H19 0059
   Serial number: 2971110022      

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 4H0-959-792.clb
   Part No SW: 4H0 959 792 F    HW: 4H0 959 792 F
   Component: TSG BF        H07 0166
   Revision: --------    Serial number: 0000122015644
   Coding: 011D07200400453005080000
   Shop #: WSC 31414 790 00001
   VCID: 3B24EEF55361B4824A1-806E

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540-)       Labels:| 7P0-907-801.clb
   Part No SW: 7P0 907 801 F    HW: 7P0 907 801 F
   Component: EPB           H51 1201
   Revision: 00000000    Serial number: A11A2200049    Dataset Number:             A001
   Coding: 01040200
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_ParkbA7 000006
   ROD: EV_ParkbA7.rod
   VCID: 3632FFC168C369EAB5F-8062

   Slave 3:

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range (J745)       Labels:. 7P6-907-357.clb
   Part No SW: 7P6 907 357     HW: 7L6 907 357 C
   Component: AFS-ECU       H04 0110
   Revision: --------    Serial number: -------------- Dataset Number: 7P0036v____ 0009
   Coding: 010A00010F000400
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_HeadlRegulVWAFS 005006
   ROD: EV_HeadlRegulVWAFS_VW52.rod
   VCID: 7CA62DE9166F73BA03B-8028

   Left_headlamp_power_output_stage:
   Subsystem 1 - Part No SW: 8U0 941 329     HW: 8U0 941 329   Labels: 3D0-941-329.CLB
   Component: LeiMo links  H01 0003
   Coding: 130000

   Right_headlamp_power_output_stage:
   Subsystem 2 - Part No SW: 8U0 941 329     HW: 8U0 941 329   Labels: 3D0-941-329.CLB
   Component: LeiMo rechts  H01 0002
   Coding: 130000

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels: None
   Part No SW: 7P6 035 180     HW: 7P6 035 180
   Component: RCD550        H82 0037
   Revision: AA001001    Serial number: VWZ8Z3L890003A
   Coding: 010004100400000030FEB50B00
   Shop #: WSC 58559 000 1048576
   VCID: 6E8217A15093112ABDF-803A

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 B    HW: 4H0 959 795 B
   Component: TSG HL        H09 0167
   Revision: --------    Serial number: 0000121988579
   Coding: 011C07200000253005080000
   Shop #: WSC 31414 790 00001
   VCID: 3A2AEBF15C5B8D8A517-806E

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure (J502)       Labels: 3Y0-907-273.clb
   Part No SW: 7P6 907 273 F    HW: 7P6 907 273 F
   Component: RDKBERU25     H09 0008
   Serial number: 10000000053010 Dataset Number: 7P6096v____ 0017
   ASAM Dataset: EV_RDKBERU25 003006
   ROD: EV_RDKBERU25_VW52.rod
   VCID: 3FDC9AE547F9A8A2669-806A

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels: Redir Fail!
   Part No SW: 7P0 907 383 F    HW: 7P0 907 383 B
   Component: Anhaenger     H09 0110
   Revision: 5A001001    Serial number: 00000160938704
   Coding: 020D000000000000
   Shop #: WSC 31414 790 00001
   VCID: 3B24EEF55361B4824A1-806E

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect. (----)       Labels:| 7N0-959-107.clb
   Part No SW: 7P6 959 107 A    HW: 7P6 959 107
   Component: HDSG-Modul    H10 0620
   Revision: 22010001    Serial number: 309100653 Dataset Number: 7P6959107A  D043
   Coding: 0533314003
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_HeckkTouar 202137
   ROD: EV_HeckkTouar.rod
   VCID: 3D20E0ED4DF5BAB2745-8068

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 B    HW: 4H0 959 795 B
   Component: TSG HR        H09 0167
   Revision: --------    Serial number: 0000121991687
   Coding: 011C07200000253005080000
   Shop #: WSC 31414 790 00001
   VCID: 3A2AEBF15C5B8D8A517-806E

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone (J412)       Labels:| 7P6-035-730.clb
   Part No SW: 5K0 035 730 E    HW: 5K0 035 730 E
   Component: TELEFON       H09 2902
   Revision: 1B001001    Serial number: 00007661044592 Dataset Number: 5K0035730E  0001
   Coding: 0A10000000010110
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_UHVNA A01719
   ROD: UHVNA.rod
   VCID: 270C2285BF6900623E9-8072

No fault code found.

-------------------------------------------------------------------------------
Address A7: Infotain. Interface (J885)       Labels:* None
   Part No SW: 7P6 907 540 A    HW: 1K0 907 951
   Component: IF CAN Infot. H27 0012
   Serial number: 061111F2000634
   Coding: 04052602000000001003
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_InfotInterConti 001002
   ROD: EV_InfotInterConti.rod
   VCID: 372CF2C56FC990E2AE9-8062

No fault code found.

End----------(Elapsed Time: 01:50, VBatt start/end: 14.6V/14.7V)-----------

Saturday,24,August,2024,13:27:21:16709
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 24.7.0.0 (x64)  HEX-V2 CB: 0.4643.5
Data version: 20240715 DS356.3
www.Ross-Tech.com


VIN: WVGEK9BPXCDXXXXXX   License Plate:
Mileage: 256441km-159345mi   Repair Order:


                Address 01: Engine  (7P0 907 401 J)

13:27:19
  IDE00365   Injection quantity deviation cylinder 1 -0.35 mg/stroke
  IDE00366   Injection quantity deviation cylinder 2 -0.84 mg/stroke
  IDE00367   Injection quantity deviation cylinder 3 0.69 mg/stroke
  IDE00368   Injection quantity deviation cylinder 4 0.72 mg/stroke
  IDE00369   Injection quantity deviation cylinder 5 0.20 mg/stroke
  IDE00370   Injection quantity deviation cylinder 6 -0.40 mg/stroke
  ENG109054   Standard_deviation_of_main_combustion_cylinder_1 0.00
  ENG113332   Standard_deviation_of_main_combustion_cylinder_2 7.40
  ENG109055   Standard_deviation_of_main_combustion_cylinder_3 0.00
  ENG109056   Standard_deviation_of_main_combustion_cylinder_4 0.00
  ENG121955   Standard_deviation_of_main_combustion_cylinder_5 0.00
  ENG113336   Standard_deviation_of_main_combustion_cylinder_6 0.00

 

[DrPeter]

Hello,

Thank you for your post, the Auto-Scan and the additional injector deviation data.

Based on what we have seen in known good vehicles, the "Standard_deviation_of_main_combustion_cylinder_2" seems too high. Was this with Key-On, Engine-Off?


Although this is a different engine (a 4-cylinder vs. a 6-cylinder), the data should be the same.
Please note, there are three separate controller channel maps in the post below.
https://forums.ross-tech.com/index.php?threads/17861/#post-352702

The first map is with the Key-On and the Engine-Off where all are at [0.00], the second and third are with the engine running and all the deviation values are very close to each other.


I suspect (as you may also) there is a concern with #2 Injector. You could remove a glow plug and see if it looks wet or different from the others.

If you do swap an injector to see if the concern moves or end up replacing any of the injectors, be sure to adjust the "Injector Quantity Adjustment (IMA) and Injector Voltage Adjustment (ISA)" Adaptations accordingly.

3.0l V6 TDI (BKS/BMK/BUN) - Ross-Tech Wiki

wiki.ross-tech.com

Hope this helps,

drpeter

 

[andrePNW]

Hello,

Thank you for your post, the Auto-Scan and the additional injector deviation data.

Based on what we have seen in known good vehicles, the "Standard_deviation_of_main_combustion_cylinder_2" seems too high. Was this with Key-On, Engine-Off?


Although this is a different engine (a 4-cylinder vs. a 6-cylinder), the data should be the same.
Please note, there are three separate controller channel maps in the post below.
https://forums.ross-tech.com/index.php?threads/17861/#post-352702

The first map is with the Key-On and the Engine-Off where all are at [0.00], the second and third are with the engine running and all the deviation values are very close to each other.


I suspect (as you may also) there is a concern with #2 Injector. You could remove a glow plug and see if it looks wet or different from the others.

If you do swap an injector to see if the concern moves or end up replacing any of the injectors, be sure to adjust the "Injector Quantity Adjustment (IMA) and Injector Voltage Adjustment (ISA)" Adaptations accordingly.

3.0l V6 TDI (BKS/BMK/BUN) - Ross-Tech Wiki

wiki.ross-tech.com

Hope this helps,

drpeter

Hi Peter,

Appreciate your response. These values of deviation were with the engine-on which also caught me off guard as I didn't expect them all to stay at 0.00.

Here's the deviation values with keyon engine off, which are thankfully what I'd expect.

10:18:23
  IDE00365   Injection quantity deviation cylinder 1 0.00 mg/stroke
  IDE00366   Injection quantity deviation cylinder 2 0.00 mg/stroke
  IDE00367   Injection quantity deviation cylinder 3 0.00 mg/stroke
  IDE00368   Injection quantity deviation cylinder 4 0.00 mg/stroke
  IDE00369   Injection quantity deviation cylinder 5 0.00 mg/stroke
  IDE00370   Injection quantity deviation cylinder 6 0.00 mg/stroke
  ENG109054   Standard_deviation_of_main_combustion_cylinder_1 0.00 °
  ENG113332   Standard_deviation_of_main_combustion_cylinder_2 0.00 °
  ENG109055   Standard_deviation_of_main_combustion_cylinder_3 0.00 °
  ENG109056   Standard_deviation_of_main_combustion_cylinder_4 0.00 °
  ENG121955   Standard_deviation_of_main_combustion_cylinder_5 0.00 °
  ENG113336   Standard_deviation_of_main_combustion_cylinder_6 0.00 °

Did a bit more metrics after that data grab, and increasing the rpm bumped the deviation on cylinder #2 up to 30 degrees. With the rpms not able to stabilize meaning it just jumps all over.

Here's a graph snap for reference, granted I expected the other cylinders to be above 0 degrees but then again I'm not super familiar. (top green is cylinder #2)

Also worth adding... definitely more white exhaust which gives off a pleasant diesel aroma.

 

[andrePNW]

So... I swapped injectors around and it did not follow the injector.

However... the more I poked around in vcds the more I wondered if the other cylinders should be reporting any standard_deviation data at all? And that it makes sense for cylinder 2 to be showing deviation data and not the other cylinders.

I say that because.. I know the glow plugs on #2 and #5 have the combustion sensor as part of it. However, when looking at deviation data and cylinder pressures cylinder 2 is the only one reporting anything when I would expect cylinder #5 as well?

Based on that map you linked it clearly showed all the cylinders reporting deviation data/etc when running/idle. But the passat seems to have a combustion sensor on all four glowplugs from what I could tell.

I know yours is newer @SaVAGeSoot but is there any chance I could see what your standard_deviation and/or cylinder pressures read out? Just to calm my mental on what data I should/shouldn't be seeing.

 

[SaVAGeSoot]

I know yours is newer @SaVAGeSoot but is there any chance I could see what your standard_deviation and/or cylinder pressures read out? Just to calm my mental on what data I should/shouldn't be seeing.

Here's what I have on file... from earlier this year

                Address 01: Engine  (7P0 907 401 K)

15:55:35
  IDE00365   Injection quantity deviation cylinder 1 0.05 mg/stroke
  IDE00366   Injection quantity deviation cylinder 2 0.10 mg/stroke
  IDE00367   Injection quantity deviation cylinder 3 -0.05 mg/stroke
  IDE00368   Injection quantity deviation cylinder 4 0.16 mg/stroke
  IDE00369   Injection quantity deviation cylinder 5 -0.14 mg/stroke
  IDE00370   Injection quantity deviation cylinder 6 -0.12 mg/stroke
  IDE01922   Vehicle distance driven 201626 km

My CNRB only has one cylinder pressure sensor vs your CATA with two of them, so I'm not sure if trying to give you a reading off that will do anything for you.

 

[SaVAGeSoot]

So... I swapped injectors around and it did not follow the injector.

This tells me that there's a physical issue with Cyl #2.
You need to do a compression test on that cylinder. (well, all cylinders really, but at least #2 and one other to see how out of whack #2 is)

 

[andrePNW]

This tells me that there's a physical issue with Cyl #2.
You need to do a compression test on that cylinder. (well, all cylinders really, but at least #2 and one other to see how out of whack #2 is)

Yeah, that's what's up next I'm just trying to sort out why the rest of the cylinders report nothing and if that's normal or not. Would think at the very least cylinder #5 would return some sort of standard deviation due to the sensor in the glowplug.

Since we're currently basing cylinder #2 reporting deviation as a potentially bad thing, but the maps I've seen from other TDI engine's (the one linked) show near-matching deviation combustion for all cylinders.

 

[SaVAGeSoot]

There should be an IDE that you can read off cyl 2 and cyl 5 which will tell you the pressures.
I do recall having looked at mine once, but I don't have the IDE handy....

 

[SaVAGeSoot]

On the CNRB it is

IDE05361       Maximum cylinder 2 cylinder pressure

 

[SaVAGeSoot]

Would think at the very least cylinder #5 would return some sort of standard deviation due to the sensor in the glowplug.

I suspect that the ECU does not rely on the GP pressure sensor to calculate those deviations, but it instead calculates the acceleration of the crank based on position and can thus determine which cylinder need to be "adjusted" to keep everything smooth...... if it was relying on the GP pressure sensor, it wouldn't have anything to compare in the case of the CNRB where it only has one of those....

 

[andrePNW]

There should be an IDE that you can read off cyl 2 and cyl 5 which will tell you the pressures.
I do recall having looked at mine once, but I don't have the IDE handy....

Yeah, I came across those last night luckily. (just pulled the data again for reference)

                Address 01: Engine  (7P0 907 401 J)

08:10:35
  IDE00021   Engine RPM 759 /min
  IDE00025   Coolant temperature 64 °C
  IDE00196   Engine oil temperature 55.0 °C
  IDE05360   Maximum cylinder 1 cylinder pressure 0.000 bar
  IDE05361   Maximum cylinder 2 cylinder pressure 41.367 bar
  IDE05362   Maximum cylinder 3 cylinder pressure 0.000 bar
  IDE05363   Maximum cylinder 4 cylinder pressure 0.000 bar
  IDE06605   Maximum cylinder 5 cylinder pressure 0.000 bar
  IDE06606   Maximum cylinder 6 cylinder pressure 0.000 bar

I suspect that the ECU does not rely on the GP pressure sensor to calculate those deviations, but it instead calculates the acceleration of the crank based on position and can thus determine which cylinder need to be "adjusted" to keep everything smooth...... if it was relying on the GP pressure sensor, it wouldn't have anything to compare in the case of the CNRB where it only has one of those....

As for the ECU, yeah I don't know of a way to see what it relies on. In the case of combustion deviation I'm just assuming it "could be" the GP considering the type of sensor it is, but that's a very far out guess haha.


End all, i'll test all the cylinders tonight.

 

[SaVAGeSoot]

Swap #2 and #5 GPs.... I'm guessing the pressure sensor on #5 is dead...

 

[andrePNW]

Swap #2 and #5 GPs.... I'm guessing the pressure sensor on #5 is dead...

Yeah, that's what I'm figuring.

Would that sensor biting the bullet cause this mess? I don't know how/what those values would impact in terms of the entire combustion/timing logic if any... Only one way to find out I suppose.

 

[SaVAGeSoot]

Doubt it, but there's gotta be an explanation why #5 reads zero... unless you have a 5 cyl engine....

 

[andrePNW]

Doubt it, but there's gotta be an explanation why #5 reads zero... unless you have a 5 cyl engine....

At this rate, that might be the case hahaha

 

[andrePNW]

So... I haven't swapped the GP's yet but..

Compression test checked out to be within spec. (Yes i know.. should've taken that time to swap the GPs but it spaced my mind)

However, at random I was thinking.. Let's unplug the egr valve!

Low and behold with the egr unplugged the treg runs flawlessly (minus the newly generated dtc). I pawned a new egr valve of the same model off a friend but the issue prevails if plugged in..

Any ideas? At this rate I'm extremely unfamiliar.

 

[SaVAGeSoot]

What were the compression check values?

 

[andrePNW]

What were the compression check values?

Going to check myself this weekend if the gps come out as planned...

I haven't had the treg for nearly a month as I took it to a local "vw" specialist shop for an "opinion" and let's just say... I'm never going back

 

[andrePNW]

Compressions finally done... On a cold engine since that's where the issue lies.
1 - 350
2 - 400
3 - 390
4 - 350
5 - 350
6 - 380

I saw in the manual that the max difference is 5.. Just 5... which i'm assuming means 5 bar? So based where i live it's 5x30? = 150 max psi difference. That seems wildly large but..

Any grand ideas?

 

[RGH0]

1 bar = 14.7 psi so 5 bar is 75 psi which you are within