S8 Low Fuel Pressure
My S8 is in immaculate condition despite the higher mileage. For that reason I rarely drive it, and sits in my garage for months at a time. The car sat for a few months, but usually with Seafoam for fuel stabilization and cleaning. Car drove fine, UNTIL I added Shell 93 Octane. The car was difficult to start, and then began hesitating and sputtering. I add a bottle of 104 Octane boost, thinking I got lower octane and or bad fuel. Car runs a little better. I drive about 30 miles, and notice it still has some fuel problem. I add a SECOND bottle of 104 Octane Boost, and the car drives normal. The next day I drive the car in 40 degree temperature 110 miles. At the Sunoco gas station after fueling, the car once again is difficult to start, and then starts sputtering and hesitating. Luckily I revved it up, and got on the highway back home and just left the car driving in cruise control. This was only achieved in EPC Mode with the CEL ON. The car would stall out when slowing down or coming to a prolonged stop.
Here's the WEIRD part. I add a can of Seafoam into the tank and the problem almost seems gone. The car drives normal. I add fresh gas again, and the same fuel pressure problems arise. I change the fuel filter. It didn't seem clogged at all. Then on to the same problems, as the fuel filter WAS NOT the culprit. So I decide to change the HP Fuel Pumps, as I don't want to have anymore problems. The car THEN seems GREAT, drives well with good throttle pressure, BUT after 15 miles of test drive, starts to hesitate and experience cylinder misfires. I return home, to scan the car and reset. I drive the car again, and it's in the worst state now.
Only drives a miles, and then starts to hesitate, sputter and stall out. IF I let the car idle for a few minutes, I can probably drive 1/2 a miles before it stalls out again.. Using VCDS Module 140, I see the fuel pressure is AT SPEC, until it stalls out. Then it begins to drop rapidly, sputter, and usually stall out. I know I have some type of fuel pressure problem, but I just don't understand what else is left. I installed NEW HITACHI HP Fuel Pumps, and a MANN Fuel Filter. Any advice is appreciated. Here is my VCDS Scan.
2007 Audi S8 5.2L V10
Mileage: 227550km-141393miles
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
06-Seat Mem. Pass -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
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
34-Level Control -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
38-Roof Electronics -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: Malfunction 0010
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: OK 0000
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
67-Voice Control -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
72-Door, Rear Right -- Status: Malfunction 0010
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine Labels:. 07L-910-552-BSM1.clb
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI 0040
Revision: 5AH15--- Serial number: AUX3Z0G2718726
Coding: 01060009190F0160
Shop #: WSC 02313 785 00200
VCID: 204F1B5FF3B75696EB-8074
VINID: 9D19607841150C778004910624477A066F
3 Faults Found:
000135 - Fuel Rail/System Pressure
P0087 - 002 - Too Low - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 227533 km
Time Indication: 0
Date: 2024.12.19
Time: 21:33:06
Freeze Frame:
RPM: 2326 /min
Load: 62.3 %
Speed: 14.0 km/h
Temperature: 93.0 C
Temperature: 30.0 C
Absolute Pres.: 1010.0 mbar
Voltage: 13.462 V
005703 - Check Coding of ECUs on Powertrain Data Bus
P1647 - 001 - - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 227534 km
Time Indication: 0
Date: 2024.12.21
Time: 15:25:12
Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 10.0 C
Temperature: 13.0 C
Absolute Pres.: 1000.0 mbar
Voltage: 11.938 V
012555 - Low Pressure Fuel regulation
P310B - 008 - Fuel Pressure Outside Specification - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 227545 km
Time Indication: 0
Date: 2024.12.27
Time: 13:30:46
Freeze Frame:
RPM: 1665 /min
Load: 15.7 %
Speed: 75.0 km/h
Temperature: 83.0 C
Temperature: 27.0 C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V
Readiness: 0110 1101
-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09E-927-156.lbl
Part No SW: 4E1 910 156 K HW: 09E 927 156 B
Component: AG6 09E 5,2 FSI USA 0030
Revision: --H01--- Serial number: 0104224
Coding: 0000002
Shop #: WSC 02313 785 00200
VCID: 2B55FC738A7185CE4E-807E
No fault code found.
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4E0-910-517.clb
Part No SW: 4E0 910 517 D HW: 4E0 614 517 AB
Component: ESP 5.7 allrad H46 0500
Coding: 0001627
Shop #: WSC 02313 000 00000
VCID: 2447174FE7AF4AB68F-8070
No fault code found.
-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: 4E0-910-131.lbl
Part No SW: 4E0 910 131 HW: 4E0 909 131 L
Component: FBS AUDID3 H10 0190
Revision: 01904910 Serial number: AUX3Z0G2718726
Coding: 0410624
Shop #: WSC 02311 785 00200
VCID: 58BF73BFEB67DE56D3-800C
Subsystem 1 - Part No: XXXXXXXXXXX
Component: ELV XXXX
No fault code found.
-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass Labels: None
Part No SW: 4E0 910 760 D HW: 4E0 959 760 B
Component: Sitzmemory BFS H02 0010
Revision: 00000000 Serial number: 5DS 008 795-03
Coding: 4071520
Shop #: WSC 02313 785 00200
VCID: 2447174FE7AF4AB68F-8070
No fault code found.
-------------------------------------------------------------------------------
Address 07: Control Head Labels: 4E0-910-7xx-07.clb
Part No SW: 4E0 910 732 C HW: 4E0 035 729 A
Component: Interfacebox H43 4140
Revision: 00000000 Serial number: 348CO077522443
Coding: 0000003
Shop #: WSC 02313 785 00200
VCID: 224B1157FDBB4486FD-8076
Subsystem 1 - Part No: 4E0 910 611
Component: E0380 BedienteilH01 0040
Subsystem 2 - Serial number: 00000000034162
Subsystem 3 - Serial number: 0128.03.070000000100010009
Subsystem 4 - Serial number: 010009
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: None
Part No SW: 4E0 910 043 B HW: 4E0 820 043 G
Component: KLIMAAUTOMAT 017 0450
Revision: 00000032 Serial number: 00000000117514
Coding: 0041281
Shop #: WSC 02311 785 00200
VCID: 1C372FAFDFDF727637-8048
No fault code found.
-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 4E0-910-279.clb
Part No SW: 4E0 910 279 Q HW: 4E0 907 279 Q
Component: ILM Fahrer H15 0230
Coding: 0133123
Shop #: WSC 02313 785 00200
VCID: 3663DD074133C82621-8062
Subsystem 1 - Part No: 4E1 910 113 C
Component: Wischer WWS D3 H60 0420
Coding: 00000034
Shop #: WSC 02313
Subsystem 2 - Part No: 4E0 910 557 A Labels: 8K0-955-559.CLB
Component: REGENLICHTSENSORH13 0090
Coding: 00139548
Shop #: WSC 02313
No fault code found.
-------------------------------------------------------------------------------
Address 0E: Media Player 1 Labels: 4E0-910-111.lbl
Part No SW: 4E0 910 110 C HW: 4E0 035 110 A
Component: MP3-Changer H44 0350
Revision: 00044000 Serial number: AUZ5ZBG3173943
Shop #: WSC 00000 000 00000
VCID: 183F33BF2BE71E5613-804C
No fault code found.
-------------------------------------------------------------------------------
Address 0F: Digital Radio Labels: 4E0-910-593-SIR.lbl
Part No SW: 4E0 910 593 H HW: 4E0 035 593 D
Component: SDAR SIRIUS H06 0080
Revision: 00000000 Serial number: AUZ4Z7G0068742
Shop #: WSC 00000 000 00000
VCID: 2C57FF6F8F7F82F647-8078
No fault code found.
-------------------------------------------------------------------------------
Address 11: Engine II Labels:. 07L-910-552-BSM2.clb
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI 0040
Revision: 5AH15--- Serial number: AUX3Z0G2718726
Coding: 01060009190F0160
Shop #: WSC 02313 785 00200
VCID: 204F1B5FF3B75696EB-8074
No fault code found.
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4E0-910-655-94.lbl
Part No SW: 4E0 910 655 C HW: 4E0 959 655 J
Component: Airbag 9.41 H14 4230
Revision: 91H14423 Serial number: 0037Q0G02J4Y
Coding: 0532707
Shop #: WSC 02313 785 00200
VCID: 26430D479193B8A691-8072
Subsystem 1 - Part No: 4E0 910 339
Component: BF-Gewichtsens. H01 0030
Subsystem 2 - Serial number: 3J5NA
Subsystem 3 - Serial number: 0001.01.0000H0100000000000 63
Subsystem 4 - Serial number: 000000 63328RB40229D575L 63
Subsystem 5 - Serial number: 9D575L 63428RB40229D5A0K 63
Subsystem 6 - Serial number: 9D5A0K 63528RB40229D5A3O 63
Subsystem 7 - Serial number: 9D5A3O 63628RB40229D5A4Q 63
Subsystem 8 - Serial number: 9D5A4Q 63729RB4020813F3F 63
Subsystem 9 - Serial number: 813F3F 63829RB4020813C3D
Subsystem 10 - Serial number: 813C3D
No fault code found.
-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4E0-910-549.lbl
Part No SW: 4E0 910 549 HW: 4E0 953 549
Component: Lenks ulenmodul H14 0040
Coding: 0012141
Shop #: WSC 02311 785 00200
VCID: 65C14A4BAC1573BE58-8030
Subsystem 1 - Part No: XXXXXXXXXXX
Component: Lenkradmodul H07 0090
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4E0-910-xxx-17.lbl
Part No SW: 4E0 910 951 F HW: 4E0 920 951 F
Component: KOMBIINSTR. VDO H82 0530
Revision: D05 Serial number: AUDID3G2000482
Coding: 0048203
Shop #: WSC 04526 002 1048576
VCID: 285F037F9B87AED6A3-807C
No fault code found.
-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels:. 4L0-910-468.clb
Part No SW: 4L0 910 468 HW: 4L0 907 468
Component: J533__Gateway H06 0040
Revision: 00H06000 Serial number: 0900B073198075
Coding: F5D5DFFF707A0E
Shop #: WSC 02313 785 00200
VCID: 6CD73F6F4FFF42F607-8038
No fault code found.
-------------------------------------------------------------------------------
Address 1E: Media Player 2 (R192) Labels:. 4E0-035-785.lbl
Part No SW: 4E0 035 785 B HW: 4E0 035 785 B
Component: SG ext.Player H09 0700
Revision: 00000000
VCID: 275D00435699A1AEAA-8072
No fault code found.
-------------------------------------------------------------------------------
Address 34: Level Control Labels: 4E0-910-553.clb
Part No SW: 4E0 910 553 J HW: 4E0 907 553 F
Component: LUFTFDR.-CDC H06 6310
Coding: 0015510
Shop #: WSC 25190 002 1048576
VCID: 2A5BF977858B9CC6B5-807E
No fault code found.
-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No SW: 4E0 910 760 D HW: 4E0 959 760 B
Component: Sitzmemory FS H02 0010
Revision: 00000000 Serial number: 5DS 008 795-03
Coding: 4071530
Shop #: WSC 02313 785 00200
VCID: 2447174FE7AF4AB68F-8070
No fault code found.
-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4E0-910-88x-37.lbl
Part No SW: 4E0 910 888 M HW: 4E0 919 887 L
Component: MNS US H48 1100
Revision: 00000000 Serial number: 381CK077520480
Shop #: WSC 22163 444 999999
VCID: 387FD33F4B273E5633-806C
No fault code found.
-------------------------------------------------------------------------------
Address 38: Roof Electronics Labels: 4E0-910-135.lbl
Part No SW: 4E0 910 135 A HW: 4E0 907 135
Component: Dachknoten D3 H05 0090
Serial number: 00000705100086
Coding: 0003477
Shop #: WSC 02313 785 00200
VCID: 1D3122ABC4C57B7EC0-8048
No fault code found.
-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 4E1-910-802-42.lbl
Part No SW: 4E1 910 802 B HW: 4E1 959 801 D
Component: T rsteuer.FS BRM005 0180
Coding: 0032364
Shop #: WSC 02313 785 00200
VCID: 204F1B5FF3B75696EB-8074
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. Labels:. 4E0-910-289.lbl
Part No SW: 4E0 910 289 C HW: 4E0 907 289 C
Component: Komfortgeraet H09 0020
Revision: 00200009 Serial number: W040703290050
Coding: 0048702
Shop #: WSC 02313 785 00200
VCID: 2959067B808D97DEBC-807C
Subsystem 1 - Part No: 4E0 910 853
Component: Heckdeckel P14H06 0070
Subsystem 2 - Part No: 4E0 907 719
Component: Neigungssensor H05 0020
2 Faults Found:
01134 - Alarm Horn (H12)
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 161
Reset counter: 97
Mileage: 215084 km
Time Indication: 0
Date: 2018.06.05
Time: 07:07:21
01134 - Alarm Horn (H12)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 161
Reset counter: 97
Mileage: 215084 km
Time Indication: 0
Date: 2018.06.05
Time: 07:07:21
-------------------------------------------------------------------------------
Address 47: Sound System Labels: None
Part No SW: 4E0 910 466 C HW: 4E0 035 466
Component: BO_D3 H06 0310
Revision: 20S00002 Serial number: 00702070007979
Coding: 0000026
Shop #: WSC 02313 785 00200
VCID: 26430D479193B8A691-8072
Subsystem 1 - Part No: 4E0 910 465 B
Component: BO_D3_SLAVE H31 0310
Subsystem 2 - Serial number: 01202070005723
Subsystem 3 - Serial number: 0212.02.070000000100030079
Subsystem 4 - Serial number: 030079
1 Fault Found:
02558 - Rear Left Mid-Range/Woofer Loudspeaker (R159)
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 218
Mileage: 227553 km
Time Indication: 0
Date: 2024.12.27
Time: 13:51:51
Freeze Frame:
Voltage: 12.30 V
Temperature: 28.0 C
Bin. Bits: 00000100
Voltage: 12.00 V
Temperature: 32.0 C
-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II Labels: None
Part No SW: 4E0 910 280 A HW: 4E0 907 280 B
Component: ILM Beifahrer H11 0070
Revision: Serial number: 00000000005801
Coding: 0010111
Shop #: WSC 02313 785 00200
VCID: 1E3325A7C9C36066D9-804A
Subsystem 1 - Part No: 4E0 910 511 A
Component: UGDO HL US H04 0050
Subsystem 2 - Serial number: 0253440T1A3605
No fault code found.
-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. Labels: 4E1-910-802-52.lbl
Part No SW: 4E1 910 802 B HW: 4E1 959 802 D
Component: T rsteuer.BF BRM005 0180
Coding: 0032364
Shop #: WSC 02313 785 00200
VCID: 204F1B5FF3B75696EB-8074
No fault code found.
-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 4E0-910-801.clb
Part No SW: 4E0 910 801 D HW: 4E0 907 801 B
Component: EPB A4EC0230 H03 0230
Revision: --H03---
Coding: 0000732
Shop #: WSC 12298 002 1048576
VCID: 204F1B5FF3B75696EB-8074
No fault code found.
-------------------------------------------------------------------------------
Address 55: Headlight Range Labels: 4F0-910-357.lbl
Part No SW: 4F0 910 357 F HW: 4F0 907 357 F
Component: AFS 1 H01 0020
Revision: 00000001 Serial number:
Coding: 0000018
Shop #: WSC 02313 785 00200
VCID: 2959067B808D97DEBC-807C
Subsystem 1 - Part No: 4F0 941 329 D
Component: AFS-Modul links H01 0010
Subsystem 2 - Part No: 4F0 941 329 D
Component: AFS-Modul rechtsH01 0010
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 4E0-910-541.lbl
Part No SW: 4E0 910 541 Q HW: 4E0 035 541 S
Component: TUNER EU/US/RDW H42 0620
Revision: 00000000 Serial number: 396CV077569013
Coding: 0000002
Shop #: WSC 02313 785 00200
VCID: 2E53F567B963F0E669-807A
No fault code found.
-------------------------------------------------------------------------------
Address 61: Battery Regul. Labels: 4E0-910-181.lbl
Part No SW: 4E0 910 181 C HW: 4E0 915 181 C
Component: J0644 BEM H12 0550
Revision: 00000000 Serial number: 00000000002605
Shop #: WSC 46291 000 1048576
VCID: 204F1B5FF3B75696EB-8074
Subsystem 1 - Part No: 4E0 915 105 A
Component: von VA0 33100881PJ
Coding: 34453039313531303541205641303333313030383831504A
Shop #: WSC 46291 000 1048576
No fault code found.
-------------------------------------------------------------------------------
Address 62: Door, Rear Left Labels: 4E0-910-802.lbl
Part No SW: 4E0 910 802 A HW: 4E0 959 801 D
Component: T rsteuer.HL BRM005 0180
Coding: 0032364
Shop #: WSC 02313 785 00200
VCID: 1E3325A7C9C36066D9-804A
No fault code found.
-------------------------------------------------------------------------------
Address 65: Tire Pressure Labels: 4E0-910-273.lbl
Part No SW: 4E0 910 273 A HW: 4F0 907 273 A
Component: Reifendruck 3 H05
Revision: 00050340 Serial number: 00000700050227
Coding: 0232428
Shop #: WSC 02313 785 00200
VCID: 204F1B5FF3B75696EB-8074
No fault code found.
-------------------------------------------------------------------------------
Address 67: Voice Control Labels: 4E0-910-75x-67.lbl
Part No SW: 4E0 910 754 Q HW: 4E0 035 753 A
Component: SDS 3501 US H45 0630
Revision: 00000000 Serial number: 00000703160028
Shop #: WSC 12336 024 394758
VCID: 3467E70F574FDA361F-8060
No fault code found.
-------------------------------------------------------------------------------
Address 6C: Back-up Cam. Labels: 4E0-910-441.clb
Part No SW: 4E0 910 441 HW: 4L0 907 441 A
Component: J772__Rearview 0050
Revision: --H12--- Serial number: 525PA8-J73106Q
Coding: 1121402
Shop #: WSC 02313 785 00200
VCID: 5CB76FAF9F5F3276F7-8008
No fault code found.
-------------------------------------------------------------------------------
Address 72: Door, Rear Right Labels: 4E0-910-802.lbl
Part No SW: 4E0 910 802 A HW: 4E0 959 802 D
Component: T rsteuer.HR BRM005 0180
Coding: 0032364
Shop #: WSC 02313 785 00200
VCID: 1E3325A7C9C36066D9-804A
1 Fault Found:
02124 - Exterior Door Handle Switch
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 3
Fault Frequency: 0
Reset counter: 217
Mileage: 227520 km
Time Indication: 0
Date: 2024.12.19
Time: 21:17:42
-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 4E0-910-283.lbl
Part No SW: 4E0 910 283 C HW: 4E0 919 283 C
Component: Parkhilfe 8-Kan H12 0040
Revision: 00H12000 Serial number: 08730707111108
Coding: 0221208
Shop #: WSC 02313 785 00200
VCID: 23451453E2A14D8EF6-8076
No fault code found.
-------------------------------------------------------------------------------
Address 77: Telephone Labels: 4E0-910-336.lbl
Part No SW: 4F0 910 336 H HW: 4E0 862 335
Component: Handyvorb2 H16 1130
Revision: 00000000 Serial number: 00000007570268
Coding: 0010900
Shop #: WSC 00000 000 00000
VCID: 285F037F9B87AED6A3-807C
No fault code found.
End-------------------------(Elapsed Time: 03:26)--------------------------
An ohm reading at the pump motor connection should be around 5 - 10 ohms. A higher reading means electric pump winding has failed.
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