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

  1. #1
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    Misfire after aborted scan, ECU comm problems, 2005 S4 Cabriolet b6 8H BHF 4.2 V8

    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.

    [IMG]C:\Ross-Tech\VCDS\Logs\error codes 8-12-2016.png[/IMG]
    [IMG]C:\Ross-Tech\VCDS\Logs\8-12-2016 lambda and no response.docx[/IMG]

    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

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    Benevolent Dictator Uwe's Avatar
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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-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  4. #3
    NostraJackAss Jack@European_Parts's Avatar
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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.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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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)
    99.0C Coolant Temperature (G62)
    0.0 % Lambda Control Bank 1
    0.0 % Lambda Control Bank 2

  6. #5
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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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    Benevolent Dictator Uwe's Avatar
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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-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  9. #7
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    Quote Originally Posted by Uwe View Post
    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)
      102.0C  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)
      102.0C  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)
      102.0C  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)
      102.0C  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)
      102.0C  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)
      103.0C  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
    Last edited by Uwe; 08-14-2016 at 09:40 PM. Reason: CODE tags

  10. #8
    NostraJackAss Jack@European_Parts's Avatar
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    Still no auto-scan and one big "Additive" vacuum leak.............
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

  11. #9
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    Misfire after aborted scan, ECU comm problems, 2005 S4 Cabriolet b6 8H BHF 4.2 V8

    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.

  12. #10
    NostraJackAss Jack@European_Parts's Avatar
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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.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

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