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

  1. #11
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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.

  2. #12
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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.

  3. #13
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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: Tőrsteuer.FS BRM 3020  
    
       Subsystem 2 - Part No: 8H1959802B
       Component: Tőrsteuer.BF BRM 3020  
    
       Subsystem 3 - Part No: 8H0959801A
       Component: Tőrsteuer.HL BRM 0002  
    
       Subsystem 4 - Part No: 8H0959802A
       Component: Tőrsteuer.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)--------------------------

  4. #14
    NostraJackAss Jack@European_Parts's Avatar
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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.
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    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
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  5. #15
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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.

  6. #16
    NostraJackAss Jack@European_Parts's Avatar
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    A vacuum leak......... fuel delivery issue or timing problem would...........
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  7. #17
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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

  8. #18
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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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  10. #19
    NostraJackAss Jack@European_Parts's Avatar
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    It is possible to have a leak on one side while also having pump deviations too.
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  11. #20
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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.





    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
    Last edited by RichS; 08-18-2016 at 06:22 PM. Reason: photo technique

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