Hello everyone, I need some help. I have been chasing problems with my S8 5.2 v10 for a while now and I'm a bit stumped. I replaced all plugs, swapped some coilpacks around, swapped out the oil separator, checked for vacuum leaks, and did a carbon cleaning but the problems remain.I feel that there could still be a vacuum leak, but I can't locate any. I am getting very odd fuel trims and a lean code for ECU 1. These are from Engine Other (which shows both ECU's simultaneously, ECU 1 on top 2 on bottom).
For reference
group 32 = long term fuel trims
group 33 = short term fuel trims
You can see that my ECU 1 Adaptation partial is maxed out positive 25% on both banks, while the idle adaptation is maxed out negative 6.6% on both banks.
The ECU 2 also shows some questionable trims but not nearly as bad.
One thing that confuses me is that the intake has dual MAFs one on each side, with duel intake boots, but once they hit the manifold, they are combined. In my mind, this would negate any side to side vacuum leaks since there's no logical way the engine could discern between the sides on the intake vacuum.
I should also point out that the MAFs show about equal g/s so I think they are ok, I will post their numbers later. if needed. I'd be curious to know what others read on their MAFs, at idle with the same setup, this may lead me to a clue.
Additionally after I did the carbon cleaning the problem seemed to have changed to be different on either engine module, before that the fuel trims were both high negatives. I am also concerned that I messed something up in the carbon cleaning process, perhaps something leaked into the cats or o2's.
For reference
group 32 = long term fuel trims
group 33 = short term fuel trims
You can see that my ECU 1 Adaptation partial is maxed out positive 25% on both banks, while the idle adaptation is maxed out negative 6.6% on both banks.
The ECU 2 also shows some questionable trims but not nearly as bad.
One thing that confuses me is that the intake has dual MAFs one on each side, with duel intake boots, but once they hit the manifold, they are combined. In my mind, this would negate any side to side vacuum leaks since there's no logical way the engine could discern between the sides on the intake vacuum.
I should also point out that the MAFs show about equal g/s so I think they are ok, I will post their numbers later. if needed. I'd be curious to know what others read on their MAFs, at idle with the same setup, this may lead me to a clue.
Additionally after I did the carbon cleaning the problem seemed to have changed to be different on either engine module, before that the fuel trims were both high negatives. I am also concerned that I messed something up in the carbon cleaning process, perhaps something leaked into the cats or o2's.
Code:
Address 01: Engine Labels: Redir Fail!
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 5AH15--- Serial number: AUX3Z0G0715212
Coding: 01060009190F0160
Shop #: WSC 22309 444 91613
VCID: 204F9C96F3EBA7862B-8074
3 Faults Found:
008569 - Bank 2; System Too Lean off Idle
P2179 - 001 -
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182875 km
Time Indication: 0
Date: 2020.07.04
Time: 12:42:42
Freeze Frame:
RPM: 629 /min
Load: 34.1 %
Speed: 0.0 km/h
Temperature: 100.0°C
Temperature: 42.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.716 V
008567 - Bank 1; System Too Lean off Idle
P2177 - 001 -
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182875 km
Time Indication: 0
Date: 2020.07.04
Time: 12:42:43
Freeze Frame:
RPM: 629 /min
Load: 34.1 %
Speed: 0.0 km/h
Temperature: 100.0°C
Temperature: 42.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.716 V
Address 11: Engine II Labels: Redir Fail!
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 5AH15--- Serial number: AUX3Z0G0715212
Coding: 01060009190F0160
Shop #: WSC 22309 444 91613
VCID: 204F9C96F3EBA7862B-8074
4 Faults Found:
000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182871 km
Time Indication: 0
Date: 2020.07.04
Time: 12:02:57
Freeze Frame:
RPM: 2478 /min
Load: 62.3 %
Speed: 46.0 km/h
Temperature: 102.0°C
Temperature: 55.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V
000775 - Cylinder 7
P0307 - 001 - Misfire Detected - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182871 km
Time Indication: 0
Date: 2020.07.04
Time: 12:02:57
Freeze Frame:
RPM: 2478 /min
Load: 62.3 %
Speed: 46.0 km/h
Temperature: 102.0°C
Temperature: 55.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V
000784 - Cylinder 10
P0310 - 002 - Misfire Detected - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182917 km
Time Indication: 0
Date: 2020.07.05
Time: 19:48:56
Freeze Frame:
RPM: 1710 /min
Load: 38.8 %
Speed: 47.0 km/h
Temperature: 93.0°C
Temperature: 39.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 13.462 V
000776 - Cylinder 8
P0308 - 008 - Misfire Detected
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 182934 km
Time Indication: 0
Date: 2020.07.09
Time: 10:43:21
Freeze Frame:
RPM: 897 /min
Load: 48.6 %
Speed: 15.0 km/h
Temperature: 30.0°C
Temperature: 23.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 12.446 V