Rev Up and Try to Stall - No Fault Codes

A6 All/ S6 All
#1

Well…I got a good couple months of trouble free motoring. :joy:
My car (2007 S6 108k) recently started trying to stall and now seems to want to rev high briefly (2500rpm) and then try to stall. I am hoping you all might help me narrow it down. Here are the symptoms and things I’ve noticed:

  • Seems to only occur somewhat randomly until car is about halfway warmed up. Then it runs fine.
  • No fault codes
  • Ran vag com scan which showed no fault codes. (except TPMS)
  • Ran throttle valve adaptation successfully.
  • I had been thinking maybe bad fuel or a fuel problem, but the sudden revving up suggests something else.
  • It acts a little like it did before I replaced throttle valve electrical connectors, except no warning lights.
  • There is a high pitched electronic tone coming from the passenger side throttle body when ignition first turned. No tone from driver side.
  • Checked MAFs, which appear clean.
  • If I try to put it in gear prior to it idling down all the way, it likes to lurch. It’s always done this since I’ve had it, but I’m guessing it’s not normal.
    I don’t see any smoking gun, so I’m hoping these clues may bring something to mind.
    Thank you for your help!

image
image2874×2164 2.73 MB

#2

Throttle issues are hard to pin down when the throttle body isn’t under constant issue.

The good news is you can look at the throttle bodies in the logs. Pull the intake back off and run the adaption again this time with someone helping you. Watch to see if each throttle body is running it’s full adaption. From there always check your LTFT data and throttle angle at idle.

It can be more frustrating that it isn’t consistent. Notably I’d just check the connectors and make sure there are no issues since the replacement of the connectors.

2 Likes
#3

Thank you for the suggestions @CountVohn!
I think I did what you suggested. Note that the car started and idled normally during this test.
I ran an adaptation with intake tubes off and it seemed to be successful. The throttle valves did not move, at least enough to see. I then did some logging at idle. Here is a screenshot:

IMG_7778
IMG_77781512×2016 940 KB

Is the “Adaptation (idle)” supposed to be zero? It seems like it should. I’m happy to post the log if you want to see it.
Do these numbers seem normal? I think there’s nothing out of the ordinary here. But again, it was acting normal.
I will check the wiring next, but I was super careful with my soldering and taping and wrapping in loom. So I’m hesitant to mess that all up. :laughing:

#4

Adaption at idle would depend on if the car is still in cold start or not. Cold start there isn’t much going on until the 02s warm up.

To me this all looks as it should.

#5

Thank you for looking at the info and for the feedback.
It is definitely only happening intermittently and until the car gets to about 100degrees Fahrenheit. When I come to a stop it’s like it wants to shut down and then wants to lurch.
If you have any more tips I’d appreciate it.

#6

ID try a smoke test cold and on a warm motor in the condition it happens. The throttle bodies can act up and that might be the cause of the issues but that can be really hard to track down. You did the wire repair so that removes some issues but it’s good to check some of these other things as well.

#7

This has been happening really infrequently, but the other day I finally was able to get an intermittent code of P0192 Fuel Pressure Sensor Short to GND. With its behavior, I’m thinking the sensor is either going bad or there is some wiring issue. Since it’s so infrequent, I’m going to keep driving until it gets colder out and then tackle it. I’m learning that this car always has some issue and I’m learning that it’s not the end of the world. :joy:

#8

Fault codes can be something you hate to see while at the same time something you welcome. The fuel pressure code might be helpful in getting to the bottom of the total issue. The stalling part makes a bit more sense than the wanting to rev but the fact that they’re both not constant lends you to think it stands more likely to be related.

1 Like
#9

I would say this. When you get a code. Copy the code and help post it here. To document the issues and the conditions when they happen. It will help all of us help you while documenting the event situations to help possible situations where it might happen so you can look for it.

#10

Thank you for the reminder @justincredible; that’s my bad. I attached the scans to this reply. I think the first scan was one system and the second is an all systems scan. Thank you.

Saturday,19,February,2022,17:29:38:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.9.0.2 (x64) HEX-V2 CB: 0.4555.4
Data version: 20210903 DS330.0
www.Ross-Tech.com

VIN: WAUGN94F37N089902 License Plate:

VCDS Release 21.9.0: SRI Reset
Control Module Part Number: 4F0 910 930 C Labels: 4F0-910-xxx-17.lbl
Component:KOMBIINSTR. M73 H18 0120, Coding:2129268
Operation: Please select an operation

Channel Description Unit Current val. New val.
02 Service Reminder Status 1 —
40 Mileage since Service miles x100 101 —
41 Time since Service Days 380 —
42 Min Mileage to Service miles x100 100 —
43 Max Mileage to Service miles x100 100 —
44 Max Time to Service Days 365 —
45 Oil Quality 1 —
47 Soot Quantity km x100 0 —
48 Thermal Load km x100 47 —
49 Min Time to Service Days 365 —

Saturday,19,February,2022,17:33:00:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.9.0.2 (x64) HEX-V2 CB: 0.4555.4
Data version: 20210903 DS330.0

VIN: WAUGN94F37N089902 License Plate:

            Address 65: Tire Pressure       Labels: 4F0-910-273-BA.lbl

Control Module Part Number: 4F0 910 273 B HW: 4F0 907 273 A
Component and/or Version: Reifendruck 3 H05 0100
Software Coding: 0062725
Work Shop Code: WSC 02335 785 00200
VCID: 221DE5CF48C9B4DB915-8076
1 Fault Found:

01521 - Sensor for Tire Pressure
004 - No Signal/Communication - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 3
Fault Frequency: 115
Reset counter: 167
Mileage: 159020 km
Time Indication: 0
Date: 2019.01.27
Time: 16:08:44

         Freeze Frame:
                (no units): 30.0
                Voltage: 13.80 V
                (no units): 61.0
                    Not Recogn.
                    Not Recogn.
                    Not Recogn.
                    Not Recogn.

Friday,01,July,2022,16:03:03:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64) HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0

VIN: WAUGN94F37N089902 License Plate:

            Address 01: Engine  (4F1 910 552 A)

16:03:00 Group 001: General
0 /min Engine Speed (G28)
93.0°C Coolant Temperature (G62)
0.0 % Lambda Control Bank 1/2
0.0 % Lambda Control Bank 3/4
Wednesday,16,November,2022,21:13:25:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.10.0.1 (x64) HEX-V2 CB: 0.4623.4
Data version: 20221026 DS344.0

VIN: WAUGN94F37N089902 License Plate:

            Address 11: Engine II  (4F1 910 552 A)

21:13:22
-7.0 % Lambda Control Bank 1/2
-10.5 % Lambda Control Bank 3/4
0 Misfire Counter
Enabled Misfire Recognition
0 Misfire Counter Cylinder 1
0 Misfire Counter Cylinder 2
0 Misfire Counter Cylinder 3
0 Misfire Counter Cylinder 4
0 Misfire Counter Cylinder 5
34.80 bar Fuel Rail Pressure (actual)
0.00 bar Fuel Rail Pressure (spec.)
3 Fuel Pressure Control Status
Monday,21,November,2022,12:43:24:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.10.0.1 (x64) HEX-V2 CB: 0.4623.4
Data version: 20221026 DS344.0

VIN: WAUGN94F37N089902 License Plate:

            Address 11: Engine II  (4F1 910 552 A)

12:43:22 Group 031: Lambda Control (Lambda Sensor Voltages)
0.99 Lambda Control Bank 3 (actual)
1.00 Lambda Control Bank 3 (specified)
1.00 Lambda Control Bank 4 (actual)
1.00 Lambda Control Bank 4 (specified)

12:43:22 Group 032: Lambda Control (Mixture Adaptation)
-0.4 % Adaptation (Idle) Bank 3 Sensor 1
-4.7 % Adaptation (Partial) Bank 3 Sensor 1
-0.1 % Adaptation (Idle) Bank 4 Sensor 1
-3.1 % Adaptation (Partial) Bank 4 Sensor 1
Monday,21,November,2022,12:52:28:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.10.0.1 (x64) HEX-V2 CB: 0.4623.4
Data version: 20221026 DS344.0

VIN: WAUGN94F37N089902 License Plate:

            Address 11: Engine II  (4F1 910 552 A)

12:52:20
-2.7 % Lambda Control Bank 1/2
2.3 % Lambda Control Bank 3/4
15.8 % Engine Load
0 Misfire Counter
Enabled Misfire Recognition
0 Misfire Counter Cylinder 3
-0.4 % Adaptation (Idle) Bank 3 Sensor 1
-4.7 % Adaptation (Partial) Bank 3 Sensor 1
0.0 % Adaptation (Idle) Bank 4 Sensor 1
-2.7 % Adaptation (Partial) Bank 4 Sensor 1
34.20 bar Fuel Rail Pressure (spec.)
34.99 bar Fuel Rail Pressure (actual)
Saturday,21,January,2023,11:40:28:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.10.0.1 (x64) HEX-V2 CB: 0.4623.4
Data version: 20221026 DS344.0

VIN: WAUGN94F37N089902 License Plate:

            Address 11: Engine II  (4F1 910 552 A)

11:40:24
1 Misfire Counter
Enabled Misfire Recognition
0 Misfire Counter Cylinder 1
1 Misfire Counter Cylinder 2
0 Misfire Counter Cylinder 3
0 Misfire Counter Cylinder 4
0 Misfire Counter Cylinder 5
0 Misfire Counter Cylinder 6
0 Misfire Counter Cylinder 7
0 Misfire Counter Cylinder 8
0 Misfire Counter Cylinder 9
0 Misfire Counter Cylinder 10
Saturday,21,January,2023,14:38:06:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.10.0.1 (x64) HEX-V2 CB: 0.4623.4
Data version: 20221026 DS344.0

VIN: WAUGN94F37N089902 License Plate:

            Address 01: Engine       Labels: 07L-910-552-BSM1.clb

Control Module Part Number: 4F1 910 552 A HW: 4F1 907 552
Component and/or Version: 5.2L V10/4V FSI ª0040
Software Coding: 01050009190F0160
Work Shop Code: WSC 66565 257 00032
VCID: 221DE5CF48C9B4DBDD6-8076
1 Fault Found:

008567 - Bank 1; System Too Lean off Idle
P2177 - 001 - - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 173137 km
Time Indication: 0
Date: 2022.11.10
Time: 14:21:34

         Freeze Frame:
                RPM: 1674 /min
                Load: 37.2 %
                Speed: 34.0 km/h
                Temperature: 91.0°C
                Temperature: 21.0°C
                Absolute Pres.: 950.0 mbar
                Voltage: 13.843 V

Readiness: 0000 0000
Sunday,18,June,2023,14:46:40:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 23.3.1.0 (x64) HEX-V2 CB: 0.4631.4
Data version: 20230421 DS346.2

VIN: WAUGN94F37N089902 License Plate:

            Address 01: Engine  ()

14:46:17
N/A Engine Speed (G28)
N/A Mass Air Flow Sensor (G70)
N/A Idle Regulator
N/A Idle Stabilization Self-Adaptation
11.7 % Throttle Valve Sensor 1 (G187)
88.3 % Throttle Valve Sensor 2 (G188)
1.2 % Throttle Valve Actuation
9 Fuel Pressure Regulator
30.92 bar Fuel Rail Pressure (actual)
30.18 bar Fuel Rail Pressure (spec.)
30.92 bar Fuel Rail Pressure (actual)
-0.34 bar Fuel Rail Pressure (actual)
Wednesday,21,June,2023,18:32:30:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 23.3.1.0 (x64) HEX-V2 CB: 0.4631.4
Data version: 20230421 DS346.2

VIN: WAUGN94F37N089902 License Plate:

            Address 01: Engine       Labels: 07L-910-552-BSM1.clb

Control Module Part Number: 4F1 910 552 A HW: 4F1 907 552
Component and/or Version: 5.2L V10/4V FSI ª0040
Software Coding: 01050009190F0160
Work Shop Code: WSC 66565 257 00032
VCID: 221DE5CF48C9B4DA39F-8076
1 Fault Found:

000402 - Fuel Pressure Sensor (G247)
P0192 - 002 - Short to GND - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 0
Fault Frequency: 2
Reset counter: 255
Mileage: 175082 km
Time Indication: 0

         Freeze Frame:
                RPM: 267 /min
                Load: 31.8 %
                Speed: 0.0 km/h
                Temperature: 60.0°C
                Temperature: 24.0°C
                Absolute Pres.: 920.0 mbar
                Voltage: 12.065 V

Readiness: 0000 0000
Blockquote

Wednesday,21,June,2023,18:30:16:25692
VCDS – Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 23.3.1.0 (x64) HEX-V2 CB: 0.4631.4
Data version: 20230421 DS346.2
www.Ross-Tech.com

VIN: WAUGN94F37N089902 License Plate: TODAY
Mileage: 175120km-108814mi Repair Order:

Chassis Type: 4F (4L0)
Scan: 01 02 03 05 07 08 09 0E 0F 11 31 15 16 17 19 1E 36 37 42 46
47 4F 52 53 55 56 61 62 65 67 6C 72 76 77

VIN: WAUGN94F37N089902 Mileage: 175120km-108814miles

00-Steering Angle Sensor – Status: OK 0000
01-Engine – Status: Malfunction 0010
02-Auto Trans – Status: OK 0000
03-ABS Brakes – Status: OK 0000
05-Acc/Start Auth. – Status: OK 0000
07-Control Head – Status: OK 0000
08-Auto HVAC – Status: Malfunction 0010
09-Cent. Elect. – Status: OK 0000
0E-Media Player 1 – Status: OK 0000
0F-Digital Radio – Status: Malfunction 0010
11-Engine II – Status: OK 0000
31-Engine other – 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
1E-Media Player 2 – Status: OK 0000
36-Seat Mem. Drvr – Status: Malfunction 0010
37-Navigation – Status: OK 0000
42-Door Elect, Driver – Status: OK 0000
46-Central Conv. – Status: Malfunction 0010
47-Sound System – Status: OK 0000
4F-Centr. Electr. II – 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
61-Battery Regul. – Status: Malfunction 0010
62-Door, Rear Left – Status: OK 0000
65-Tire Pressure – Status: Malfunction 0010
67-Voice Control – Status: OK 0000
6C-Back-up Cam. – Status: OK 0000
72-Door, Rear Right – Status: OK 0000
76-Park Assist – Status: OK 0000
77-Telephone – Status: OK 0000

Address 01: Engine Labels:. 07L-910-552-BSM1.clb
Part No SW: 4F1 910 552 A HW: 4F1 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 59H09— Serial number:
Coding: 01050009190F0160
Shop #: WSC 66565 257 00032
VCID: 221DE5CF48C9B4DA39F-8076
VINID: 9D19577891160C7780209240083D7A087A

1 Fault Found:
000402 - Fuel Pressure Sensor (G247)
P0192 - 002 - Short to GND - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 0
Fault Frequency: 2
Reset counter: 255
Mileage: 175082 km
Time Indication: 0

         Freeze Frame:
                RPM: 267 /min
                Load: 31.8 %
                Speed: 0.0 km/h
                Temperature: 60.0°C
                Temperature: 24.0°C
                Absolute Pres.: 920.0 mbar
                Voltage: 12.065 V

Readiness: 0000 0000

Address 02: Auto Trans Labels: 09E-927-156.lbl
Part No SW: 4F2 910 156 M HW: 09E 927 156 C
Component: AG6 09E 5,2 FSI USA 0070
Revision: --H01— Serial number: 0096786
Coding: 0000002
Shop #: WSC 22705 444 89150
VCID: 2F3B1CFB0B1B09B2A61-807A

No fault code found.

Address 09: Cent. Elect. Labels: 4F0-910-279.lbl
Part No SW: 4F0 910 279 J HW: 4F0 907 279 A
Component: ILM Fahrer H17 0240
Revision: 00000000 Serial number: 4F0907279
Coding: 0115121
Shop #: WSC 22705 444 53973
VCID: 30391F871625164ABFB-8064

Subsystem 1 - Part No: 4F1 910 113 C Labels: 1KX-955-119.CLB
Component: Wischer AudiC6 H05 0210
Coding: 00064784
Shop #: WSC 22705

Subsystem 2 - Part No: 4E0 910 557 A Labels: 8K0-955-559.CLB
Component: REGENLICHTSENSORH13 0090
Coding: 00146221
Shop #: WSC 22705

No fault code found.

Address 11: Engine II Labels:. 07L-910-552-BSM2.clb
Part No SW: 4F1 910 552 A HW: 4F1 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 59H09— Serial number:
Coding: 01050009190F0160
Shop #: WSC 91520 999 69871
VCID: 221DE5CF48C9B4DA39F-8076

No fault code found.

Address 61: Battery Regul. Labels: 4F0-910-181.clb
Part No SW: 4F0 910 181 E HW: 4F0 915 181 A
Component: J0644 BEM H12 0590
Revision: 00000000 Serial number: 00000000152346
Shop #: WSC 22302 444 85830
VCID: 2313E0CB57D3BDD2329-8076

Subsystem 1 - Part No: 000 915 05D L
Component: von VA0 310708820C
Coding: 3030303931353035444C2056413033313037303838323043
Shop #: WSC 00000 384 00290

2 Faults Found:
02272 - Quiescent Current Stage 1
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 255
Mileage: 170107 km
Time Indication: 0
Date: 2022.06.17
Time: 13:38:43

02273 - Quiescent Current Stage 2
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 255
Mileage: 170107 km
Time Indication: 0
Date: 2022.06.17
Time: 13:42:09

No fault code found.

End----------(Elapsed Time: 02:11, VBatt start/end: 12.1V/12.1V)-----------

#11

Some good data here. Rkuffel is it ok if we have the mods edit out the data you don’t need to help make the post easier to read?

#12

I don’t mind at all, thank you. I’ll try to weed it out a bit, the next time I scan as well.

#13

Yeah it helps get to the root of the matter –

008567 - Bank 1; System Too Lean off Idle
P2177 - 001 - - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 173137 km
Time Indication: 0
Date: 2022.11.10
Time: 14:21:34

Issue number 1

1 Fault Found:
000402 - Fuel Pressure Sensor (G247)
P0192 - 002 - Short to GND - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 0
Fault Frequency: 2
Reset counter: 255
Mileage: 175082 km
Time Indication: 0

#14

I decided to see if I could log what the fuel pressure is doing and see if I can capture the “stalling.” I graphed the data and it looks like I captured it. There are some interesting things happening here. Note the following:

  • The X axis is the time stamp.
  • The yellow line is engine load in %
  • The blue line is the spec fuel rail pressure in bar.
  • The red line is the actual fuel rail pressure in bar.
  • The green line is the % capacity(?) of the electric fuel pump in the tank

Like typical, before about 78degrees Celsius everything looks great. After the anomaly, everything looks great. Right around time stamp 415, I pressed on the gas (maybe 50% throttle?) and the car bucked. You can see the spec called for 47.1 bar and the fuel rail indicated 4.47 bar. One second later, everything is fine again. So…I am thinking that this is a fuel pressure sensor issue as the error code shows. If you see something or have any other thoughts about it I appreciate the feedback.

IMG_8036
IMG_80363997×2067 1.56 MB

#15

Did another data log today. Again, some weird things happening. I remembered that this started when I replaced the high pressure fuel regulator on the passenger side with a no-brand regulator. Could be related. On line 151, you can see the fuel rail pressure drops down to 5 for a second, but what really interesting is that the low pressure fuel pressure jumps to 66% and the regulator jumps up to 189 (whatever that number means). This makes me wonder if one of the HPFP regulators is cutting the pressure off a lot quickly and this creates back pressure causing the electric fuel pump pressure to jump and also causing a stall. The time stamps would support that too. Here is the data in case anyone is curious:230820_AudiDataLogpdf.pdf (174.3 KB)

#16

Log the same thing in the same string of events on the good side. Then lets compare

#17

Hmm, not sure I understand. Are you saying to log the fuel pressure regulator on the other side? I’m not sure if that’s possible.

#18

Yeah sorry. What we want to see is the effect on bank to bank short term fuel trims. So what you can do is monitor the fuel pressure then see how this effects the banks.

#19

Ahhh, okay, that makes sense. Good idea! Thank you for clarifying. I’ll give that a whirl.