Misfire after aborted scan, ECU comm problems, 2005 S4 Cabriolet b6 8H BHF 4.2 V8

   #1  

RichS

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While I was clearing fault codes in my 2005 S4 cabriolet, B6 8H BHF 4.2 V8, my laptop died. The engine started running rough after the scan, returning codes of:

4 Faults Found:

16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - - MIL ON
16685 - Cylinder 1
P0301 - 001 - Misfire Detected - MIL ON
16687 - Cylinder 3
P0303 - 001 - Misfire Detected - MIL ON
16686 - Cylinder 2
P0302 - 002 - Misfire Detected - MIL ON

Readiness: N/A

Several other cylinders also misfire - 7 and 4. The complete scans are listed below.
Should I somehow recode or re-adapt my ECU? If so, how do I do that? There are also communication problems with module 1.




I had just completed some extensive canbus repairs - using factory repair wires and a new driver's side wiring harness plug; the entire door connection was fatigued. The passenger seat control module was recently replaced, and I also cleaned the corrosion from the power top (comfort and convenience module) connections - so no more single wire mode of operation on the comfort bus.

I am a first time poster so if the scans and images are not correctly posted, I'll learn how and try again.

i am hoping this is not the dreaded timing chain tensioner failure or a plugged catalytic converter.

Rich
 
   #2  

Uwe

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The other stuff you were working on does not strike me as related to this problem.

If an engine runs rough after clearing fault codes, chances are the fuel trims were off. Clearing fault codes resets them to nominal values.
Please have a look at our Wiki page about fuel trim. You may find the video at the bottom helpful as well.

You can't post pictures directly from your hard drive. Please see: How to Post Pictures.

-Uwe-
 
   #3  

Jack@European_Parts

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Do you have the old scan before the car had codes cleared?

Please post a complete auto-scan and observe blocks for trims.

Water mist from spray bottle or garden hose usually helps find vacuum leaks fast.......further intensifying the misfire.
 
   #4  

RichS

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helpful/ thanks / next?

The videos are greatly appreciated - thanks.
The MIL light is on - in your experience, does the ECU re-map itself quickly, or are the catalytic converters at risk? It ran a little better after warming up for 15 minutes per Ross-tech's suggestion.

Should I just drive the car?

Or should I try to recover previously mapped values - if that is even possible.

Current values for group 32 look like this after warming up - I wonder if the lambda control = 0.0% is becasuse i cleared the DTC's.

Address 01: Engine (8H0 910 560 L)

14:08:42 Group 032: Lambda Control (Mixture Adaptation)
-0.4 % Adaptation (Idle) Bank 1 Sensor 1
-14.1 % Adaptation (Partial) Bank 1 Sensor 1
1.5 % Adaptation (Idle) Bank 2 Sensor 1
9.4 % Adaptation (Partial) Bank 2 Sensor 1

14:08:42 Group 003: General
720 /min Engine Speed (G28)
5.81 g/s Mass Air Flow Sensor (G70)
2.7 % Throttle Valve Angle
6.0 °BTDC Ignition Timing Angle

14:08:42 Group 001: General
680 /min Engine Speed (G28)
99.0°C Coolant Temperature (G62)
0.0 % Lambda Control Bank 1
0.0 % Lambda Control Bank 2
 
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RichS

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Thank you for the response - I don't have an old scan that shows MB's 32 or 33, but I will run those shortly. I do have various old scans, but they don't show any other module 1 errors. Obviously, I should have run logs of MB's 32 and 33 before clearing fault codes - but should I have done anything else?
 
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Uwe

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Something wonky is going on there. -14% on bank 1 and +9.5% on bank 2..!?!?

Remind me, does this engine have one MAF or two?

-Uwe-
 
   #7  

RichS

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Something wonky is going on there. -14% on bank 1 and +9.5% on bank 2..!?!?

Remind me, does this engine have one MAF or two?

-Uwe-
One MAF, S4 5 valve 4.2 v8, timing chain motor. It became smoother at 1300 RPM, no misfires a t that speed. Idles rough though. The wonkiness started after my errant DTC clearing / laptop failure...wish i had not done that.

New scans: Misfire on 1-4 cylinders, MIL light on from misfires at idle.

Code:
                Address 01: Engine  (8H0 910 560 L)

12:50:46 Group 033: Lambda Control
  0.0 %  Lambda Control Bank 1 Sensor 1
  1.560 V  Sensor Voltage Bank 1 Sensor 1
  9.4 %  Lambda Control Bank 2 Sensor 1
  1.560 V  Sensor Voltage Bank 2 Sensor 1

12:50:46 Group 032: Lambda Control (Mixture Adaptation)
  -2.1 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.3 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:50:46 Group 001: General
  2640 /min  Engine Speed (G28)
  102.0°C  Coolant Temperature (G62)
  3.1 %  Lambda Control Bank 1
  9.4 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:50:47 Group 033: Lambda Control
  4.7 %  Lambda Control Bank 1 Sensor 1
  1.600 V  Sensor Voltage Bank 1 Sensor 1
  4.7 %  Lambda Control Bank 2 Sensor 1
  1.500 V  Sensor Voltage Bank 2 Sensor 1

12:50:47 Group 032: Lambda Control (Mixture Adaptation)
  -2.1 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.3 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:50:47 Group 001: General
  2600 /min  Engine Speed (G28)
  102.0°C  Coolant Temperature (G62)
  1.6 %  Lambda Control Bank 1
  8.6 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:50:51 Group 033: Lambda Control
  3.1 %  Lambda Control Bank 1 Sensor 1
  1.440 V  Sensor Voltage Bank 1 Sensor 1
  9.4 %  Lambda Control Bank 2 Sensor 1
  1.540 V  Sensor Voltage Bank 2 Sensor 1

12:50:51 Group 032: Lambda Control (Mixture Adaptation)
  -2.1 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.3 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:50:51 Group 001: General
  2560 /min  Engine Speed (G28)
  102.0°C  Coolant Temperature (G62)
  7.8 %  Lambda Control Bank 1
  5.5 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:50:54 Group 033: Lambda Control
  3.1 %  Lambda Control Bank 1 Sensor 1
  1.500 V  Sensor Voltage Bank 1 Sensor 1
  3.9 %  Lambda Control Bank 2 Sensor 1
  1.480 V  Sensor Voltage Bank 2 Sensor 1

12:50:54 Group 032: Lambda Control (Mixture Adaptation)
  -2.1 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.3 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:50:54 Group 001: General
  2600 /min  Engine Speed (G28)
  102.0°C  Coolant Temperature (G62)
  -0.8 %  Lambda Control Bank 1
  7.8 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:51:03 Group 033: Lambda Control
  -10.2 %  Lambda Control Bank 1 Sensor 1
  1.620 V  Sensor Voltage Bank 1 Sensor 1
  -10.9 %  Lambda Control Bank 2 Sensor 1
  1.600 V  Sensor Voltage Bank 2 Sensor 1

12:51:03 Group 032: Lambda Control (Mixture Adaptation)
  -2.4 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.1 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:51:03 Group 001: General
  720 /min  Engine Speed (G28)
  102.0°C  Coolant Temperature (G62)
  -14.8 %  Lambda Control Bank 1
  -7.0 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:51:10 Group 033: Lambda Control
  0.0 %  Lambda Control Bank 1 Sensor 1
  1.180 V  Sensor Voltage Bank 1 Sensor 1
  0.0 %  Lambda Control Bank 2 Sensor 1
  1.460 V  Sensor Voltage Bank 2 Sensor 1

12:51:10 Group 032: Lambda Control (Mixture Adaptation)
  -2.4 %  Adaptation (Idle) Bank 1 Sensor 1
  -9.4 %  Adaptation (Partial) Bank 1 Sensor 1
  2.1 %  Adaptation (Idle) Bank 2 Sensor 1
  10.9 %  Adaptation (Partial) Bank 2 Sensor 1

12:51:10 Group 001: General
  720 /min  Engine Speed (G28)
  103.0°C  Coolant Temperature (G62)
  0.0 %  Lambda Control Bank 1
  0.0 %  Lambda Control Bank 2

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


                Address 01: Engine  (8H0 910 560 L)

12:53:13 Group 015: Ignition (Misfire Recognition - Cylinder 1-3)
  250  Misfire Counter Cylinder 1
  222  Misfire Counter Cylinder 2
  250  Misfire Counter Cylinder 3
  Enabled  Misfire Recognition

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


                Address 01: Engine  (8H0 910 560 L)

12:53:24 Group 016: Ignition (Misfire Recognition - Cylinder 4-6)
  217  Misfire Counter Cylinder 4
  0  Misfire Counter Cylinder 5
  0  Misfire Counter Cylinder 6
  Enabled  Misfire Recognition

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


                Address 01: Engine  (8H0 910 560 L)

12:53:28 Group 017: Ignition (Misfire Recognition - Cylinder 7-8)
  0  Misfire Counter Cylinder 7
  0  Misfire Counter Cylinder 8
       
  Enabled  Misfire Recognition
 
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   #9  

RichS

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Uwe, thank you for enclosing my scan in
Code:
 blocks. 
Jack@ European, I don't have access to my VAG-COM at the moment - but I will correctly post a complete auto scan tomorrow, complete with code tags. Thank you for your patience. 
More recent scans show only misfires, similar to the first scan I posted, but extending to cylinder 4 as well. None recently on cylinders 5-8. 


	
	


Code:
16684 - Random/Multiple Cylinder Misfire Detected 
P0300 - 001 - - MIL ON
16685 - Cylinder 1 
P0301 - 001 - Misfire Detected - MIL ON
16687 - Cylinder 3 
P0303 - 001 - Misfire Detected - MIL ON
16686 - Cylinder 2 
P0302 - 002 - Misfire Detected - MIL ON
I am heading out with a water mist bottle. Would RPM then drop (misfire intensifies?) with a spray? I resolved communication issues with the ECU by extending the timeout parameter in vag-com.
 
   #10  

Jack@European_Parts

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I am heading out with a water mist bottle. Would RPM then drop (misfire intensifies?) with a spray?

It should and log it with VCDS when you do this in case you cant see it.

Sounds like a intake leak , bad injector, coil pack ground being inadequate or insufficient fuel volume/PSI causing a timing chatter.
 
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   #11  

RichS

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Jack, per your suggestion, I soaked the top of the engine thoroughly with a spray bottle (of reverse osmosis water-didn't want to leave any calcium!) but saw no change in rpm or misfire. That does not mean there is not one - I did see where vacuum lines had been repaired. I can see how the vacuum leak would be worst at idle.
 
   #12  

RichS

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I will run this again with VCDS when I have my laptop available.
Do you have a feel for the location of coil pack grounds in this car? Cylinders 1-4....that does make sense.
Is it worthwhile to pull valve covers to look at timing chains, or is that even possible or useful?
I am ordering plugs at the moment, and so will check and change those. i guess I can be thankful this problem is not intermittent.
 
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RichS

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Audi S4 B6 BHF Cabriolet misfire after aborted scan

Per request - Jack, sorry for the delay - Recent auto scan, passenger seat is removed (hence airbag warning, entry assist error. Key remote is now programmed.
New: It appears I have an exhaust leak at the flex joint of the catalytic converter.
Code:
 Saturday,13,August,2016,19:26:45:29481
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 15.7.1.0 (x64)
Data version: 20150904
www.Ross-Tech.com


VIN: WUARL48H95K90xxxx   License Plate: 
Mileage: 170370km-105863mi   Repair Order: 


Chassis Type: 8H (8H - Audi Cabrio B6/B7 (2003 > 2009))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 26 36 37 45 46 55 56 57
          63 65 67 73 75 76 77
 
VIN: WUARL48H95K90xxxx   Mileage: 170370km-105863miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 079-910-560-BBK.lbl
   Part No SW: 8H0 910 560 L    HW: 8E0 907 560 
   Component: 4.2L V8/5V      G   0010  
   Revision: 00000000    Serial number: AUX6Z0D0436780
   Coding: 0007774
   Shop #: WSC 00672 785 00200
   VCID: 316933DDAB5A73B6E2-5140

4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected 
            P0300 - 001 -  - MIL ON
16685 - Cylinder 1 
            P0301 - 001 - Misfire Detected - MIL ON
16686 - Cylinder 2 
            P0302 - 001 - Misfire Detected - MIL ON
16687 - Cylinder 3 
            P0303 - 001 - Misfire Detected - MIL ON
Readiness: 0010 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 8E0 910 156 R    HW: 09L 927 156 
   Component: AG6 09L 4.2L5V USA  0060  
   Revision: --H01---    Serial number:        0098085
   Coding: 0001002
   Shop #: WSC 00672 785 00200
   VCID: 356107CD5F325F96BE-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8E0-614-517.lbl
   Part No: 8E0 614 517 Q
   Component: ABS/ESP allrad      4533  
   Coding: 04597
   Shop #: WSC 00672  
   VCID: 366300C11234548EB7-5122

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
   Part No: 8E0 820 043 AM
   Component:   A4 Klimaautomat   2831  
   Coding: 00100
   Shop #: WSC 00672  
   VCID: 6CD7E2A91CF8DE5E91-517C

1 Fault Found:
01171 - Temperature Sensor; Passenger Side Heated Seat (G60) 
            30-00 - Open or Short to Plus

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 8E0-907-279-8E2.lbl
   Part No: 8E0 907 279 F
   Component: int. Lastmodul  USA 0517  
   Coding: 01013
   Shop #: WSC 00672  
   VCID: 356107CD0F325F96BE-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio        Labels: 8E0-035-593-XM.lbl
   Part No SW: 8E0 035 593 E    HW:             
   Component: SDAR XM              
   Revision:             Serial number: AUZ4Z7D2021424
   Shop #: WSC 00000 000 00000
   VCID: 2B5521B589761966D8-517C

2 Faults Found:
02633 - Antenna for Satellite Tuner 
            009 - Open or Short to Ground
02635 - Tuner Not Enabled/Activated 
            000 -  - 

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8H0-959-655-84.lbl
   Part No: 8H0 959 655 D
   Component: Airbag 8.4EC        0015  
   Coding: 0010105
   Shop #: WSC 00672 785 00200
   VCID: 3B7511F5791689E648-5140

2 Faults Found:
01218 - Side Airbag Igniter; Passenger Side (N200) 
            001 - Upper Limit Exceeded - MIL ON
00592 - Seat Belt Switch; Passenger (E25) 
            010 - Open or Short to Plus - MIL ON

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8E0-953-549.lbl
   Part No: 8E0 953 549 N
   Component: Lenksáulenmodul     0611  
   Coding: 01141
   Shop #: WSC 00672  
   VCID: 3E7318E13A049CCE6F-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8E0-920-9xx-8E2.lbl
   Part No SW: 8H0 920 980 S    HW: 8H0 920 980 S
   Component: KOMBI+WFS 3     H12 0020  
   Revision: 0020        Serial number: AUX6Z0D0436780
   Coding: 0001231
   Shop #: WSC 19346 002 1048576
   VCID: 3F8D65E56D0E95C664-5140

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 8E0-920-9xx-8E2.lbl
   Part No SW: 8H0 920 980 S    HW: 8H0 920 980 S
   Component: KOMBI+WFS 3     H12 0020  
   Revision: 0020        Serial number: AUX6Z0D0436780
   Coding: 0001231
   Shop #: WSC 19346 002 1048576
   VCID: 3F8D65E56D0E95C664-5140

No fault code found.

-------------------------------------------------------------------------------
Address 26: Auto Roof        Labels: 8H0-959-255.lbl
   Part No: 8H0 959 255 
   Component:  VSG  B6 CABRIO     6389  
   Shop #: WSC 00672 785 00200
   VCID: 73E5F9D511C601A650-5140

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No: 8H0 959 760 
   Component: Sitzmemory EE H06   0010  
   Coding: 00002
   Shop #: WSC 00065  
   VCID: 74E7FAC944C8069E49-4B00

2 Faults Found:
02011 - Right Entry Assistance Control Module (J573) 
            49-00 - No Communications
02010 - Left Entry Assistance Control Module (J572) 
            79-00 - Please Check Fault Codes

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: None
   Part No SW: 8H0 035 192 B    HW: 8H0 035 192 B
   Component: RNS-E US3       H53 0110  
   Revision:      03S    Serial number: AUZBZ7E1700297
   Coding: 0419133
   Shop #: WSC 03751 444 57240
   VCID: 2643D0819294240E07-517C

1 Fault Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
            007 - Short to Ground
             Freeze Frame:
                    Fault Status: 01110111
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 79
                    Time Indication: 0
                    Date: 2004.06.22
                    Time: 00:28:27

             Freeze Frame:
                    Mileage: 655350 km
                    Count: 2206
                    Clock: 00:28


-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 8E0-959-433-MAX.lbl
   Part No: 8H0 959 433 E
   Component: Komfortgerát T7B    3320  
   Coding: 11788
   Shop #: WSC 00672  
   VCID: 366300C11234548EB7-4B1A

   Subsystem 1 - Part No: 8H1959801B
   Component: Tõrsteuer.FS BRM 3020  

   Subsystem 2 - Part No: 8H1959802B
   Component: Tõrsteuer.BF BRM 3020  

   Subsystem 3 - Part No: 8H0959801A
   Component: Tõrsteuer.HL BRM 0002  

   Subsystem 4 - Part No: 8H0959802A
   Component: Tõrsteuer.HR BRM 0002  

1 Fault Found:
00955 - Key 1 
            35-10 -  -  - Intermittent

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
   Part No: 4Z7 907 357 
   Component: dynamische LWR       D09  
   Coding: 00070
   Shop #: WSC 00672  
   VCID: 0407AA091468361E79-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: None
   Part No SW: 8H0 035 192 B    HW: 8H0 035 192 B
   Component: RNS-E US3       H53 0110  
   Revision:      03S    Serial number: AUZBZ7E1700297
   Coding: 0419133
   Shop #: WSC 03751 444 57240
   VCID: 2643D0819294240E07-5198

1 Fault Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
            007 - Short to Ground
             Freeze Frame:
                    Fault Status: 01110111
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 79
                    Time Indication: 0
                    Date: 2004.06.22
                    Time: 00:28:27

             Freeze Frame:
                    Mileage: 655350 km
                    Count: 2206
                    Clock: 00:28


-------------------------------------------------------------------------------
Address 63: Entry Assist,D        Labels: None
   Part No: 8H0 959 760 A
   Component: EasyEntry F M H13   0010  
   Coding: 00006
   Shop #: WSC 00065  
   VCID: 356107CD0F325F96BE-4B00

1 Fault Found:
02011 - Right Entry Assistance Control Module (J573) 
            49-00 - No Communications

End-------------------------(Elapsed Time: 06:02)--------------------------
 
   #14  

Jack@European_Parts

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Yup that leak can cause a balance issue..............fix it.

Address 01: Engine Labels: 079-910-560-BBK.lbl
Part No SW: 8H0 910 560 L HW: 8E0 907 560
Component: 4.2L V8/5V G 0010 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Firmware update required! 0020 or higher!
Revision: 00000000 Serial number: AUX6Z0D0436780
Coding: 0007774
Shop #: WSC 00672 785 00200
VCID: 316933DDAB5A73B6E2-5140


We can help with updates if needed...........please let us know via contact form.
 
   #15  

RichS

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Update - It appears that I may not have an exhaust leak, at least I cannot detect flow out of the flex joint at higher RPMs. The flex joint is visibly ripped at the end, but it does not appear that it was ever intended to be a seal, it looks like it is not a gas-tight mesh.

Any insight on how this flex joint works, if the mesh is a seal?

I also checked for the ECM firmware code G 0010 - it's status, though outdated, is no different than the code revision present during a scan 7 months ago. From the forum, there is a TSB 240850. It states that the ECM needs reprogramming because of the improper operation of the intake Camshaft Adjuster Valves. Not sure what would trigger this sudden change in idle roughness.
 
   #17  

ivagp

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post a pic of the flex joint. while the engine is running have someone block the exhaust and inspect flex joint
 
   #18  

RichS

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Vacuum leak on one side? Audi S4 BHF B6 8H Cabriolet 4.2 V8 2005

Is it possible to have a vacuum leak on one side, such that it makes one bank have large negative fuel additive numbers, while the other bank has large positive numbers? See the blocks 32- 33 scan posted previously...

I have not found the vacuum leak yet. There are vacuum leaks that have obviously been repaired. I have ordered new plugs, and will do a coil swap when they arrive. I like the idea as well of plugging the exhaust to see if the broken mesh leaks. Can one or two bad injectors, or plugs, or coils, make the whole bank go lean?

I will start another thread, but I noticed an old unrelated (?) intermittent problem that I can now reproduce: The red light in the passenger door malfunctions, when the passenger door lock malfunctions, when the window does not drop 2% on opening the door, when the door contact switch does not show the correct status in vag-com..all at once. Methinks perhaps the passenger door harness is worn at the door hinge, just like the driver's door was.
 
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RichS

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Divots in a piston...but hey, they are small divots.

Well, I am open to more optimistic viewpoints...

Here are pictures taken inside cylinder #1 with a 5mm camera. I see two shallow divots in the top of that piston. Coincidentally, that cylinder misfires first...After a while, all the cylinders in bank 1 misfire at idle. I also have a picture of the plugs here, 1,2,3 as numbered. No other pistons have divots. I have never heard the chain rattle, and I have been listening.

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I have not yet done a compression test. The engine ran smooth, no misfires, above 1400 rpm, no smoke.

Anyone know any good sources for timing chain kits...valves...valve bushings...complete S4 BHF 4.2 liter V8 engines...people that want to buy S4 cabriolets...
On the bright side, the car no longer has canbus errors. And it's pretty. And my wife likes it.

RichS
 
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