VW Touareg - rough start- 2017 V6 Tdi 150Kw

[ak77]

Hi There ,

I have noticed an issue with my 2017 TDI V6 Touareg at start-up, which has a very rough idle and started to shake.
I have only started noticing this at a cold start. I scanned the car without any indications or clues from the sensor readings. Could someone point me in the right direction regarding what I should look at?

Please advise .

Cheers
Al

Friday,10,November,2023,05:17:34:41771
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64(VMWare)
VCDS Version 23.3.1.0
Data version: 20230421 DS346.2
www.Ross-Tech.com


VIN: WVGZZZ7PZHD000954   License Plate: 1234
Mileage: 182587km-113454mi   Repair Order: 000



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


Chassis Type: 7P-VW52 (7P6)
Scan: 01 02 03 05 08 09 10 15 16 17 19 42 46 52 53 55 56 5F 62 69
          6C 6D 72

VIN: WVGZZZ7PZHD000954   Mileage: 182587km-113454miles

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
10-Park/Steer Assist -- 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
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
5F-Information Electr. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine (J623-CJMA)       Labels:. 059-907-401-V2.clb
   Part No SW: 7P1 907 401 D    HW: 4G0 907 401
   Component: 3.0TDI EDC17  H41 0001 
   Revision: 53H41---    CVN: 29B3A68F
   Coding: 292A4012233601020000
   Shop #: WSC 40950 002 1048576
   ASAM Dataset: EV_ECM30TDI0117P1907401D 001002
   ROD: EV_ECM30TDI0117P1907401D.rod
   VCID: 316926E4608A711B74-8065
   VINID: 9E65EAAAA1E0A9850000024510ADC23CBC

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

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels: 0C8-927-7XX-V2.clb
   Part No SW: 0C8 927 755 N    HW: 0C8 927 755
   Component: AL1000 AISIN  130 2877 
   CVN: C6F63456
   Coding: 010100011C008400000000000000000000000000
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_TCMAL991031 003118
   ROD: EV_TCMAL991031_003.rod
   VCID: 3C7707D0B7C88C73D7-8069

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:* 7P0-907-379.clb
   Part No SW: 7P0 907 379 R    HW: 7P0 907 379 A
   Component: MK25A         H37 0521 
   Revision: --------    Serial number: 41216442544132 Dataset Number: 7P0012v____ 0001
   Coding: 5B6B13C349242553DAFDC89892D6A470F701
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_MK25AXT 010001
   ROD: EV_ESPMK25A01000.rod
   VCID: 4C975710E7683CF367-8019

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 GM    HW: 4H0 907 064 GM
   Component: BCM2 2.0      H37 0572 
   Revision: 00002001   
   Coding: 05B60016000000000000
   Shop #: WSC 31414 790 00001
   VCID: 7AFBC1C8F57C724385-802F

   Subsystem 1 - Part No SW: 4H0 905 852 B    HW: 4H0 905 852 B
   Component: J764 ELV MLB  H40 0046
   Serial number: 3216000089135005   

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 7P6-907-040.clb
   Part No SW: 7P6 907 040 CR    HW: 7P6 907 040 CR
   Component: Klima 2 Zonen H23 1608 
   Coding: 36A6200890
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_AirCondiFront 004001
   ROD: EV_AirCondiFront_VW52.rod
   VCID: 0603A538B98406A3F1-8053

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V2.clb
   Part No SW: 4H0 907 063 DA    HW: 4H0 907 063 AA
   Component: BCM1 2.0      H20 0311 
   Revision: 22020001    Serial number: 00001366973201
   Coding: 26000014D0345D010029400300005D4C431D670827014241000000000040110000000000000000
   Shop #: WSC 40950 002 1048576
   VCID: 6ADBF18885DCC2C375-803F

   Subsystem 1 - Part No SW: 7P0 955 120     HW: 7P0 955 120
   Component: WWS    160425  033 0021
   Serial number: 90243401160517144633
   Coding: 004DBD

   Subsystem 2 - Part No SW: 7P0 955 559 E    HW: 7P0 955 559 E  Labels: 8K0-955-559.CLB
   Component: RLFS  H10 0020
   Serial number: 80834089           
   Coding: 025223

   Subsystem 3 - Part No SW: 7P6 941 431 AB    HW: 7P6 941 431 AB
   Component: E1 - LDS  H02 0040
   Serial number: 00000000002105160067

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 7P6-919-475.clb
   Part No SW: 7P6 919 475 D    HW: 7N0 919 475
   Component: PARKHILFE 8K  H06 0030 
   Revision: --------    Serial number: 28261613102463
   Coding: 318504
   Shop #: WSC 40950 002 1048576
   ASAM Dataset: EV_VW526ParkiAssis2 001013
   ROD: EV_VW526ParkiAssis2.rod
   VCID: 44877F30CF38F4B3AF-8011

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 7P0-959-655.clb
   Part No SW: 7P0 959 655 F    HW: 7P0 959 655 F
   Component: VW10Airbag00T H10 0044 
   Revision: --------    Serial number: 003S8003NBB1 Dataset Number: 7P6003V____ 1681
   Coding: 000000000000000000000000000000003054
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_AirbaVW10BPAVW526 002001
   ROD: EV_AirbaVW10BPAVW526_002_VW52.rod
   VCID: 44877F30CF38F4B3AF-8011

   Crash sensor for side airbag: driver side:
   Serial number: 3575LRB405342FVS1OO5

   Front Passenger's Side Airbag Crash Sensor:
   Serial number: 3585LRB405942AGA0H7Z

   Rear Side Airbag Crash Sensor (on driver's side):
   Serial number: 3517ARB4010554CITJC1

   Passenger side rear thorax airbag crash sensor:
   Serial number: 3527ARB4010554CIK41A

   Crash sensor for front airbag: driver side:
   Serial number: 3557BRB405T42FVU1OSR

   Crash sensor for front airbag: front passenger side:
   Serial number: 3567BRB405D43C1CQOVX

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
   Part No SW: 4H0 953 568 M    HW: 7P6 953 507 AC
   Component: Lenks.Modul   H06 0010 
   Revision: --------    Serial number: 01374PEL0000T
   Coding: 000C35
   Shop #: WSC 31414 790 00001
   VCID: 3D710AD4A4D2857BE0-8069

   Subsystem 1 - Part No SW: 7P6 959 542 A    HW: 7P6 959 542 A
   Component: E221__MFL-TAS  H04 0028
   Serial number: 0127239 TRW 20160512

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 7P6-920-xxx-17.clb-SRI1
   Part No SW: 7P6 920 883 L    HW: 7P6 920 883 L
   Component: Kombi         H13 0604 
   Revision: 13240308    Serial number: 658260516592031
   Coding: 332731002A00000800000C
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_KombiUDSRBVW526 001030
   ROD: EV_KombiUDSRBVW526.rod
   VCID: 479D683CFE0EDFAB4A-8013

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:* None
   Part No SW: 7P6 907 530 Q    HW: 7P6 907 530 F
   Component: GW-CAN-L-MOST H15 6051 
   Revision: --------    Serial number: 00000002263688 Dataset Number: V03935235BB 0001
   Coding: 000D07AD00
   Shop #: WSC 40950 002 1048576
   GVL: FB4F40051D6F000000
   ASAM Dataset: EV_GatewVW526UDS 001008
   ROD: EV_GatewUDS_VW52.rod
   VCID: 46836538F904C6A3B1-8013

   Battery Monitoring Control Module:
   Subsystem 1 - Part No SW: 7P0 915 181 C    HW: 7P0 915 181 C
   Component: Batt_Sensor  H07 0270
   Serial number: 43130627375811043921

   Voltage stabilizer:
   Subsystem 2 - Part No SW: 7PP 959 663 E    HW: 7PP 959 663 E
   Component: J532_DCDCStab  H17 0042
   Serial number: 16144001859021200181

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
   Part No SW: 4H0 959 793 AC    HW: 4H0 959 793 P
   Component: TSG FA        H03 0306 
   Revision: --------    Serial number: 0000200783054
   Coding: 011D1620D001451005080002
   Shop #: WSC 31414 790 00001
   VCID: 7AFBC1C8F57C724385-802F

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
   Part No SW: 4H0 907 064 GM    HW: 4H0 907 064 GM
   Component: BCM2 2.0      H37 0572 
   Revision: 00002001    Serial number: 0405363917   
   Coding: 019B1E20A8B9108183200624210000000000000000000000000000000000
   Shop #: WSC 40950 002 1048576
   VCID: 7AFBC1C8F57C724385-802F

   Subsystem 1 - Part No: 7P6 951 172
   Component: Sensor, DWA  005 0502

   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 S    HW: 4H0 959 792 M
   Component: TSG BF        H03 0306 
   Revision: --------    Serial number: 0000200810449
   Coding: 011D1620D001451005080000
   Shop #: WSC 31414 790 00001
   VCID: 489F6B00FB10D0D343-801D

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540-)       Labels:| 7P0-907-801.clb
   Part No SW: 7P0 907 801 G    HW: 7P0 907 801 G
   Component: EPB           H51 1201 
   Revision: 00000000    Serial number: C1652100385    Dataset Number:             A001
   Coding: 01040100
   Shop #: WSC 16417 004 1048576
   ASAM Dataset: EV_ParkbA7 000006
   ROD: EV_ParkbA7.rod
   VCID: 377D18FC8EEEAF2B3A-8063

   Slave 3:

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range (J745)       Labels:| 7P6-907-357.clb
   Part No SW: 7P6 907 357 C    HW: 7P6 907 357 B
   Component: AFS-ECU       H01 0120 
   Revision: --------    Serial number: -------------- Dataset Number: 7P0036v____ 0019
   Coding: 01AE02000B000200
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_HeadlRegulAFSMQBMLB 001001
   ROD: EV_HeadlRegulAFSMQBMLB_VW52.rod
   VCID: 3F8D70DCA6DE976BF2-806B

   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 0006
   Coding: B00000

   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 0006
   Coding: B00000

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (R)       Labels:. 4F0-035-0xx-56.clb
   Part No SW: 4G1 035 053 J    HW: 4G1 035 053
   Component: Radio U Basic H41 0133 
   Revision: AB001007    Serial number: 227EO0G2531014
   Coding: 040005020100000003
   Shop #: WSC 31414 790 00001
   VCID: 2643C5B8514426A391-8073

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 7P6 035 764 M    HW: 7P6 035 764 A
   Component: H-BNT-RW      H42 1023 
   Revision: --------    Serial number: 605E-0GB000863
   Coding: 010A01050040C1EF01002B0E00000003F00001030000000000
   Shop #: WSC 40950 002 1048576
   VCID: 43857C2CC236F38B96-8017

   Subsystem 1 - Part No: 8R0 060 884 DJ
   Component: ROW 2016  0806

   Subsystem 2 - Part No SW: 7P6 919 603 J    HW: 7P6 919 603 J
   Component: DU8 SV Touch  H56 0046
   Serial number: VWZ8Z9SGF00UDN     

   Subsystem 3 - Part No SW: 7P6 919 603 J    HW: 7P6 919 603 J
   Component: DU8 SV Touch  H56 0046
   Serial number: VWZ8Z9SGF00UDN     

   Subsystem 4 - Part No: 8R0 060 961 G
   Component: CD-Database  6890

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 P    HW: 4H0 959 795 J
   Component: TSG HL        H04 0306 
   Revision: --------    Serial number: 0000200954039
   Coding: 011814200001251005080000
   Shop #: WSC 31414 790 00001
   VCID: 489F6B00FB10D0D343-801D

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels:| 4H0-907-383-V2.clb
   Part No SW: 4H0 907 383 M    HW: 4H0 907 383 K
   Component: Anhaenger     H20 0160 
   Revision: 7C001003    Serial number: 0377273915
   Coding: 0300000202000000
   Shop #: WSC 40950 002 1048576
   ASAM Dataset: EV_TrailFunctGener2Hella 001005
   ROD: EV_TrailFunctGener2Hella_VW52.rod
   VCID: 377D18FC8EEEAF2B3A-8063

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam. (J772)       Labels:* Redir Fail!
   Part No SW: 7P6 980 556     HW: 7P6 980 556
   Component: RVC Compact   H08 0160 
   Dataset Number: V03935238CQ 0001
   Coding: 0125060123002003000040
   Shop #: WSC 40950 002 1048576
   ASAM Dataset: EV_CamSysRVRVCPANAVW526 001001
   ROD: EV_CamSysRVRVCPANAVW526.rod
   VCID: 7EF3CDD8E1545E63B9-802B

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect. (----)       Labels:| 7N0-959-107.clb
   Part No SW: 7P6 959 107 C    HW: 7P6 959 107
   Component: HDSG-Modul    H10 0043 
   Revision: 22010001    Serial number: 140600211 Dataset Number: 7p0771v____ 0012
   Coding: 0533314003
   Shop #: WSC 40950 002 1048576
   ASAM Dataset: EV_HeckkTouar 202142
   ROD: EV_HeckkTouar.rod
   VCID: 3F8D70DCA6DE976BF2-806B

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
   Part No SW: 4H0 959 795 P    HW: 4H0 959 795 J
   Component: TSG HR        H04 0306 
   Revision: --------    Serial number: 0000200855564
   Coding: 011814200001251005080000
   Shop #: WSC 31414 790 00001
   VCID: 489F6B00FB10D0D343-801D

No fault code found.

End-------------------------(Elapsed Time: 05:03)--------------------------

 

[Larry Manton]

AK77, diesels are testy when cold. Don't know how quick you fire it off, but do you wait about 3 seconds to see the glow light come on, then go off, or is it.

My wife and I have this discussion occasionally. jump in, shove the key in, then crank, all in one smooth motion.NOT!

We have no codes which is always nice, but while running rough is there any smoke from the stacks? Assume glo plugs get their Q from ambient temp, engine or other. Are these congruent with the day around you.

 

[Uwe]

diesels are testy when cold.

Modern diesels, not so much. Besides, just how cold can it possibly be Western Australia?

Could someone point me in the right direction regarding what I should look at?

Have you looked at your injector deviations?

PD and CR Injectors -- Normal Compensation Rates for Reference Comparison

Seeing how many diesel engine users wonder what a good injector compensation rate should look like on a PD / CR injector , here are my happy numbers ( from 0.00 to 0.99 mg/str). Ideally these compensation rate readings should be done at about 80-90 degrees C warm engine at idle. Will try to...

forums.ross-tech.com

-Uwe-

 

[ak77]

AK77, diesels are testy when cold. Don't know how quick you fire it off, but do you wait about 3 seconds to see the glow light come on, then go off, or is it.

My wife and I have this discussion occasionally. jump in, shove the key in, then crank, all in one smooth motion.NOT!

We have no codes which is always nice, but while running rough is there any smoke from the stacks? Assume glo plugs get their Q from ambient temp, engine or other. Are these congruent with the day around you.

The symptoms are the same regardless of whether you give glow plugs for 10 sec or longer. I will look at injectors next and replace air and fuel filters. Every day is different; today, the shake lasted longer.

 

[ak77]

Modern diesels, not so much. Besides, just how cold can it possibly be Western Australia?


Have you looked at your injector deviations?

PD and CR Injectors -- Normal Compensation Rates for Reference Comparison

Seeing how many diesel engine users wonder what a good injector compensation rate should look like on a PD / CR injector , here are my happy numbers ( from 0.00 to 0.99 mg/str). Ideally these compensation rate readings should be done at about 80-90 degrees C warm engine at idle. Will try to...

forums.ross-tech.com

-Uwe-

Thanks, mate; I will look at the deviations now and report back. It's not very cold here, even during winter. I'm thinking along the way of fuel or injectors.

 

[ak77]

does anyone know where to find the Injector Minimum Deviation section? Not listed in my software dropdown option?

 

[Uwe]

does anyone know where to find the Injector Minimum Deviation section?

Advanced Measuring Values.

Type deviation into the search/filter box.

Should be the first six things you see.

-Uwe-

 

[ak77]

Advanced Measuring Values.

Type deviation into the search/filter box.

Should be the first six things you see.

-Uwe-

Ok, I have done that part. I get the 6 readings.
I can see the numbers but where is the menu to run a minimum deviation ( basic settings or similar) like on the smaller 2L engines? Can it be done on 6cyl or just Soft Reset?

 

[ak77]

I'm noticing more and more this rattle shake is happening more as I reverse out of the garage,
Shakes and revs up as in reverse gear.

Any clues

 

[ak77]

I did the deviation measurement 3 times today under correct conditions.

IDE00... Injection quantity deviation cylinder 1
-0.83 mg/stroke

IDE00... Injection quantity deviation cylinder 2
0.60 mg/stroke

IDE00... Injection quantity deviation cylinder 3
0.20 mg/stroke

IDE0O... Injection quantity deviation cylinder 4
-0.11 mg/stroke

IDE0O... Injection quantity deviation cylinder 5
-0.09 mg/stroke

IDE0O... Injection quantity deviation cylinder 6
0.20 mg/stroke

____________________________


IDE00... Injection quantity deviation cylinder 1
-0.81 mg/stroke

IDE00... Injection quantity deviation cylinder 2
0.72 mg/stroke

IDE00... Injection quantity deviation cylinder 3
0.25 mg/stroke

IDE00... Injection quantity deviation cylinder 4
-0.08 mg/stroke

IDE00... Injection quantity deviation cylinder 5
-0.19 mg/stroke

IDE00... Injection quantity deviation cylinder 6
0.10 mg/stroke

___________________________________


IDE00….
Injection quantity deviation cylinder 1
-0.96 mg/stroke

IDE00... Injection quantity deviation cylinder 2
0.62 mg/stroke

IDE00... Injection quantity deviation cylinder
0.26 mg/stroke

IDE00... Iniection auantitv deviation cvlinder 4
-0.04 mg/stroke

IDE00.. Injection quantity deviation cylinder 5
0.12 mg/stroke

IDE00... Injection quantity deviation cylinder 6
0.00 mg/stroke

 

[ak77]

Deviation indeed

 

[Uwe]

I did the deviation measurement 3 times today under correct conditions.

Please explain what you mean by "correct conditions".

Cylinder 1 is starting to look a bit borderline, but by factory standards, it's probably acceptable, so I'm doubtful that this is the source of of the issue.

-Uwe-

 

[Larry Manton]

Okay, will bring this up, and have posted it before, mostly no comments.

Had a 99 Jetta 2.0 gas, and would hard crank, run extremely rough then die, morning only. If you could keep it running would fix itself after about a minute, only when cold, maybe not do it again for days or weeks.

So looked at all codes, none, truly wanting to fault electrical, fuel anything, not about the price just fix it.

One morning for giggles, own a DSO, VAG, and others, so put a vacuum gauge on it, and during rough run read about 15 inches of vacuum, normal IMO 20 and up. Managed to get it to die but had been running for a minute or so long enough to start to warm. Crank it over, it lites off, runs smooth and magically now pulling a solid 20 inches, 30 seconds ago 15. I did suspect oil so changed again, no change.

We know they don't heal themselves but maybe there is a lifter holding a valve tight or slightly open. This was a rebuilt motor with a VW OEM oil pump. Took it off suspecting bypass valve and seen nothing alarming. Was already in there so replaced it, problem never came up again. Oil pressure number as I recall in suspected pump were almost at 100, don't recall, but IMO high. New pump stone cold maybe 80 (has been a while) but dropping after warm.

Don't know how you would validate this in the diesel, maybe MAP, MAF, but just a thought.

 

[ak77]

Correct conditions: as per Ross-Tech recommendations, temp, etc.. I was just thinking as per the below text some vacuum hose or something?

Please explain what you mean by "correct conditions".

Cylinder 1 is starting to look a bit borderline, but by factory standards, it's probably acceptable, so I'm doubtful that this is the source of of the issue.

-Uwe-

:

 

[ak77]

Okay, will bring this up, and have posted it before, mostly no comments.

Had a 99 Jetta 2.0 gas, and would hard crank, run extremely rough then die, morning only. If you could keep it running would fix itself after about a minute, only when cold, maybe not do it again for days or weeks.

So looked at all codes, none, truly wanting to fault electrical, fuel anything, not about the price just fix it.

One morning for giggles, own a DSO, VAG, and others, so put a vacuum gauge on it, and during rough run read about 15 inches of vacuum, normal IMO 20 and up. Managed to get it to die but had been running for a minute or so long enough to start to warm. Crank it over, it lites off, runs smooth and magically now pulling a solid 20 inches, 30 seconds ago 15. I did suspect oil so changed again, no change.

We know they don't heal themselves but maybe there is a lifter holding a valve tight or slightly open. This was a rebuilt motor with a VW OEM oil pump. Took it off suspecting bypass valve and seen nothing alarming. Was already in there so replaced it, problem never came up again. Oil pressure number as I recall in suspected pump were almost at 100, don't recall, but IMO high. New pump stone cold maybe 80 (has been a while) but dropping after warm.

Don't know how you would validate this in the diesel, maybe MAP, MAF, but just a thought.

Just thinking about this and conclusion would be a sensor somewhere would pick up incorrect reading? Yes?

 

[Larry Manton]

Just thinking about this and conclusion would be a sensor somewhere would pick up incorrect reading? Yes?

AK77, not familiar with each and every car, and the ability, but 99% sure oil pressure would be shown in the advanced section.

Thinking back probably not an option on my 99, but in this case would be good to look at. JmO.

 

[Jagman246]

Hi ak77, did you fix this?
I had exactly the same issue which eventually deteriorated into a hard start, and then no-start over a period of a month.
It was the dreaded leaking injector seals (copper rings) problem where the leaking gasses overheated and cooked the injector. I left mine to long and had to replace all the injectors. I bought thm from Bosch and did it myself.