Fuel Delivery Issue - LPFP or.......?

   #1  

izack98

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C?ID=364881
2012 A3 8P 2.0 TFSI Quattro

For the longest time I have been having an issue with my car falling flat on its face when accelerating hard from a stop. It does not do it every time - but is consistent. On hard acceleration when the engine requires maximum fuel delivery.
I have replaced the fuel filter and HPFP, checked the cam follower. This has not resolved it.
Normal hard acceleration once at speed does not produce the same issue.

When accelerating hard from a stop, the engine revs to almost about 4500-6500 RPM. Then suddenly just falls flat on its face. Like someone shut the ignition off - it does not stall, it just feels that abrupt. I take my foot off the accelerator, it stumbles a bit, then runs fine. It has never stalled, or misfired. I did get a code once - P2293 - Fuel Pressure Regulator - Low Fuel Rail Pressure. I didn't have time to deal with it at the time so I reset it and continued on.
Fuel delivery appears normal when I crank tested it and delivered fuel into a bottle. Running pressure was within required specs at idle - tested with a pressure gauge.
Today I finally had time to go for a drive and log some data in VCDS.
I chose
- RPM
- Fuel Rail Pressure Specified (FRP Specified)
- Fuel Rail Pressure Actual (FRP Actual)
- Low Pressure Fuel Pump Duty Cycle (LPFP Duty Cycle %) (which I read should be around 50%)
- Accel Pedal Position % (Accel %)

What I learned from looking at the data after.
The LPFP duty cycle is fairly consistent at 48-54%. It does spike to high 60% at points where the Accel Pedal % is high (hard acceleration). It does begin to climb as I accelerate hard, and then seems to fail as it peaks around 70%. This seems to make sense as the fuel pump is working harder. But not sure whether this high percentage duty cycle is acceptable - ie - would a brand new pump have the same high duty cycle % under the same parameters or would it always read around 50%?
The Specified and Actual Fuel rail pressures stay very consistent. Usually within one bar of each other. (I am thinking that is what should be expected)

On the 4 occasions today where I experienced the car falling on its face. I see in the logged data that when the Accel Pedal is at 99% (wide open throttle - accelerating from a stop) there comes a huge difference in the Specified and Actual Fuel Rail Pressures (Specified 150 - Actual 3.5) and the Fuel Pump duty cycle shows 79.2 %.
When the LPFP duty cycle is really high (79.2%) the actual Fuel Rail Pressure falls off to just 3.5 bar. This obviously is the issue. Fuel starvation under high demand.
This is consistent in all 4 of the logged events where I experienced the issue of it falling on its face.

My question: I am thinking the issue is with the LPFP - just tired and not being able to keep up with the high demand during hard acceleration and high fuel demand.
Is there any other parameters I should check? Or does this seem to point to the LPFP?
I can run some more tests. I just want to ensure this is the issue prior to buying a new LPFP.

I have attached a link to screen shots of the relevant events in the data. I can download all the data if that helps but I thought these screen shots would be enough to show what's going on. All the other data appears normal. Just these 4 events when I had the issue.

 
   #2  

PetrolDave

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Do we have an Auto-Scan of your A3?

If we have please post a link to it, if not please post one.
 
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   #3  

izack98

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Code:
Sunday,22,November,2020,13:04:12:41341
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)  HEX-V2 CB: 0.4513.4
Data version: 20200730 DS317.0
www.Ross-Tech.com


VIN: WAUMFCFM8CA069610   License Plate:


Chassis Type: FM-AU35 (7N0)
Scan: 01 02 03 08 09 0F 15 16 17 19 22 25 42 44 46 47 52 55 56 62
          72 77

VIN: WAUMFCFM8CA069610   Mileage: 174800km-108615miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
0F-Digital Radio -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: Malfunction 0010
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Cannot be reached 1100
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010
-------------------------------------------------------------------------------
Address 01: Engine (CCT)       Labels:. 06J-906-026-CCT.clb
   Part No SW: 8P0 907 115 BB    HW: 8P0 907 115 Q
   Component: 2.0l R4/4V TFSI     0020 
   Revision: AAH18---    Serial number: AUX7Z0K9FN60QC
   Coding: 0103010A1C0F0160
   Shop #: WSC 59635 001 1048576
   VCID: 73B3DE82E7BF3F435F1-8026

1 Fault Found:
000135 - Fuel Rail/System Pressure
               P0087 - 000 - Too Low - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 0
                    Fault Frequency: 4
                    Reset counter: 255
                    Mileage: 174764 km
                    Time Indication: 0
                    Date: 2020.11.20
                    Time: 15:46:04

             Freeze Frame:
                    RPM: 5561 /min
                    Load: 82.3 %
                    Speed: 75.0 km/h
                    Temperature: 76.0°C
                    Temperature: 12.0°C
                    Absolute Pres.: 1020.0 mbar
                    Voltage: 14.097 V

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 02E-927-770.clb
   Part No SW: 02E 300 013 Q    HW: 02E 927 770 AL
   Component: GSG DSG AG6     511 2733 
   Revision: 05351113    Serial number: 00001109200929
   Coding: 0000020
   Shop #: WSC 06314 000 00000
   VCID: 1F1BE2323BB7CB234B9-804A

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 1K0-907-379-60EC1F.clb
   Part No SW: 1K0 907 379 BJ    HW: 1K0 907 379 BJ
   Component: ESP MK60EC1   H31 0121 
   Revision: 00H31001   
   Coding: 1150600F49280003881106E592190041390000
   Shop #: WSC 06314 000 00000
   VCID: 7BA3F6A2C3EF7703071-802E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8P0-820-043.lbl
   Part No SW: 8P0 820 043 BN    HW: 8P0 820 043 BN
   Component: KlimavollautomatH09 0180 
   Revision: 000020      Serial number: 8P0820043BN   
   Shop #: WSC 00000 000 00000
   VCID: 79AFECAAC5D3451315D-802C

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 8P0-907-063.clb
   Part No SW: 8P0 907 063 Q    HW: 8P0 907 063 Q
   Component: BCM PQ35  M   110 0653 
   Revision: 00110 AF   
   Coding: 6E000A2FA01336E4287241E10110094D407E62AA106DD928E40200840040
   Shop #: WSC 06314 123 12345
   VCID: 42DD4B46E485C6CB047-8016

   Subsystem 1 - Part No SW: 8P1 955 119 F    HW: 8P1 955 119 F  Labels: 1KX-955-119.CLB
   Component: Wischer AU350  H11 0050
   Coding: 00DD13

   Subsystem 2 - Part No SW: 8K0 910 557     HW: 8K0 955 559 A  Labels: 8K0-955-559.CLB
   Component: REGENLICHTSEN  H04 0003
   Coding: 024C2D

4 Faults Found:
01134 - Alarm Horn (H12)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 01:17:17

             Freeze Frame:
                        Term 15 Off
                    Voltage: 12.40 V
                        OFF
                        ON
                        Term 50 Off
                        OFF
                        OFF

00907 - Intervention load Management
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 6
                    Fault Frequency: 3
                    Reset counter: 246
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 22:50:56

             Freeze Frame:
                        Term 15 On
                    Voltage: 11.90 V
                        ON
                        ON
                        Term 50 Off
                        OFF
                        OFF

01519 - Bulb for Back-Up Lights; Right (M17)
            010 - Open or Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00101010
                    Fault Priority: 2
                    Fault Frequency: 3
                    Reset counter: 251
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.16
                    Time: 00:08:44

             Freeze Frame:
                        Term 15 On
                    Voltage: 13.95 V
                        ON
                        ON
                        Term 50 Off
                        OFF
                        ON

01518 - Bulb for Back-Up Lights; Left (M16)
            010 - Open or Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00101010
                    Fault Priority: 2
                    Fault Frequency: 3
                    Reset counter: 251
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.16
                    Time: 00:08:44

             Freeze Frame:
                        Term 15 On
                    Voltage: 13.95 V
                        ON
                        ON
                        Term 50 Off
                        OFF
                        ON


-------------------------------------------------------------------------------
Address 0F: Digital Radio        Labels: 8E0-035-593-SIR.lbl
   Part No SW: 8E0 035 593 P    HW: 8E0 035 593 P
   Component: SDAR SIRIUS     H07 0160 
   Revision: 00000000    Serial number: AUZ4Z7L0603501
   Coding: 0000102
   Shop #: WSC 06314 000 00000
   VCID: 36352796B44D6A6BB8F-8062

1 Fault Found:
01304 - Radio
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 01:16:17


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:* 8P0-959-655-10.clb
   Part No SW: 8P0 959 655 Q    HW: 8P0 959 655 Q
   Component: Airbag AU1042 H09 0250 
   Revision: --------    Serial number: 003FC001JYZX
   Coding: 30314239304130303033554A304C38503053
   Shop #: WSC 06314 000 00000
   ASAM Dataset: EV_Airba10AURB4 001001
   ROD: EV_Airba10AURB4.rod
   VCID: 50F9710E3A69245B823-8004

   Crash sensor for side airbag: driver side:
   Serial number: 3572DRB40000E154830L

   Crash sensor for side airbag: front passenger side:
   Serial number: 3582DRB40000E154A8F1

   Crash sensor for side airbag: rear: driver side:
   Serial number: 35128RB40000663052B8

   Crash sensor for side airbag: rear: passenger side:
   Serial number: 35228RB4000066027232

   Crash sensor for front airbag: driver side:
   Serial number: 35547RB4000066691F5S

   Crash sensor for front airbag: front passenger side:
   Serial number: 35647RB400006669225H

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8P0-953-549.lbl
   Part No SW: 8P0 953 549 K    HW: 8P0 953 549 K
   Component: J0527           H37 0070 
   Coding: 0014142
   Shop #: WSC 06314 000 00000
   VCID: 46D55756C4ADFAEB28F-8012

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: E0221           H02 0100

1 Fault Found:
01304 - Radio
            004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8P0-920-xxx-17-MY8.clb
   Part No SW: 8P0 920 932 Q    HW: 8P0 920 932 Q
   Component: KOMBIINSTR. VDO H02 0150 
   Revision: D0H02002    Serial number: 2249K002027223
   Coding: 0257378
   Shop #: WSC 99999 999 178631
   VCID: 42DD4B46E885C6CB047-8016

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 7N0-907-530-V2.clb
   Part No SW: 7N0 907 530 H    HW: 1K0 907 951
   Component: J533  Gateway H42 1620 
   Revision:   H42       Serial number: 210911F1001810
   Coding: 352102
   Shop #: WSC 06314 000 00000
   VCID: 3537209AA54B6173B15-8060

1 Fault Found:
01304 - Radio
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 22:56:16


-------------------------------------------------------------------------------
Address 22: AWD        Labels: 0AY-907-554-V1.clb
   Part No SW: 0BR 907 554 C    HW: 0BR 907 554 C
   Component: Haldex 4Motion      3018 
   Coding: 0000005
   Shop #: WSC 00000 000 00000
   VCID: 45D7505AF9ABF1F3215-8010

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 8P0 920 932 Q    HW: 8P0 920 932 Q
   Component: KOMBIINSTR. VDO H02 0150 
   Revision: D0H02002    Serial number: AUX7Z0K9FN60QC
   Shop #: WSC 00493 128 187042
   VCID: 42DD4B46E885C6CB047-8016

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 8P0-959-801-MIN3.lbl
   Part No SW: 8P0 959 801 Q    HW: 8P0 959 801 Q
   Component: Tuer-SG         H04 0101 
   Coding: 0001213
   Shop #: WSC 06314 000 00000
   VCID: 49CF5C6AD5B31593C5D-801C

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 M
   Component: EPS_ZFLS Kl. 233    3201 
   Revision: 00H20000   
   Shop #: WSC 02069 000 90108
   VCID: 34311D9EA231787B86B-8060

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 8Px-035-382.lbl
   Part No SW: 8P4 035 382 E    HW: 8P4 035 382 E
   Component: AB2 SUBWOOFERBOXH07 0180 
   Revision: 00006       Serial number: 92158126908401
   Shop #: WSC 00000 000 00000
   VCID: 36352796B44D6A6BB8F-8062

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 8P0 959 802 Q    HW: 8P0 959 802 Q
   Component: Tuer-SG         H04 0101 
   Coding: 0001213
   Shop #: WSC 06314 000 00000
   VCID: 4ACD6366D0B51E8BCC7-801E

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range (J431)       Labels:| 8X0-907-357.clb
   Part No SW: 8X0 907 357 C    HW: 8X0 907 357 B
   Component: ****LWR12**** H02 0011 
   Serial number: 111010-0002-058
   Coding: 1163A51010022000
   Shop #: WSC 06314 000 00000
   ASAM Dataset: EV_HeadlRegulBasic 005001
   ROD: EV_HeadlRegulBasic.rod
   VCID: 42DD4B46E405C6CB047-8016

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio
Cannot be reached

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 8P4-959-801.lbl
   Part No SW: 8P4 959 801 F    HW: 8P4 959 801 F
   Component: Tuer-SG         H04 0050 
   Coding: 0001176
   Shop #: WSC 06314 000 1012544
   VCID: 42DD4B46E885C6CB047-8016

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 8P4-959-802.lbl
   Part No SW: 8P4 959 802 F    HW: 8P4 959 802 F
   Component: Tuer-SG         H04 0050 
   Coding: 0001176
   Shop #: WSC 06314 000 1012544
   VCID: 43D34E42F79FCFC30F1-8016

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 8P0-862-335.lbl
   Part No SW: 8P1 862 336 A    HW: 8P1 862 336
   Component: FSE_256x BT     H44 0660 
   Revision: 00000000    Serial number: 00000005157766
   Coding: 0001277
   Shop #: WSC 06314 000 00000
   VCID: 36352796B44D6A6BB8F-8062

3 Faults Found:
02503 - Output Wire to Radio
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 01:16:11

01523 - Microphone for Telephone (R38)
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 01:16:11

01304 - Radio
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 6
                    Fault Frequency: 19
                    Reset counter: 211
                    Mileage: 174634 km
                    Time Indication: 0
                    Date: 2020.11.15
                    Time: 01:16:11


End----(Elapsed Time: 01:37, VBatt start/end: 12.0V/12.0V. VIgn 12.0V)-----
 
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