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Thread: 2006 Audi A4 2.0 - P0301 Cyl 1 misfire / P0300 Random misfire / RUNS BETTER ONCE WARM

  1. #1
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    Question 2006 Audi A4 2.0 - P0301 Cyl 1 misfire / P0300 Random misfire / RUNS BETTER ONCE WARM

    Hello, I have a 2006 Audi A4 2.0T FWD with the CVT transmission. It has 131,000 miles.

    I have VCDS and it is pulling two codes

    16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
    16685/P0301/000769 - Cylinder 1 Misfire Detected


    Symtoms:

    The car starts without too much hesitation, but when cold the whole car shakes pretty hard. I believe it is definitely running on 3 cylinders when cold. But once the car warms up, it doesn't shake anywhere near as bad and drives okay. There is still hesitation but the vibration is reduced greatly, and I was able to drive it 30 miles home without much of an issue. I've drove a Toyota Camry before with only 3 of 4 cylinders running and it barely had enough power to do the speed limit.

    The CEL flashes when the car is first started and the engine is cold, but once it warms up the CEL becomes solid and stays lit.



    Things I have done trying to solve the problem:

    I switched cylinder 1 and 4 coils, cleared the codes, and started the engine again. Eventually the same codes came back on. To me this rules out the coil, but I might change them all just to be safe. At least one of them has been changed before as it does not have numbers written on the top like the other 3 do. I pulled all the spark plugs and they all look rather similar. Light brown color on all of them. They are Autolite plugs (im not a fan) and will be changing those too, but I don't believe they are the problem.



    The previous owner took it to a mechanic and he said it was carbon buildup on the valves. I haven't looked into this much yet but I do know that carbon buildup is a common problem on cars with direct injection, but I am unsure if that could cause this misfire. I will look more into that and how hard it is to clean them. I don't want to pull the whole head off if I don't have to.

    Looking at Ross-Tech Wiki, it could be a lot of things causing this but I was hoping someone would have some input.

    Thanks for your help!

    -Derek

  2. #2
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    You may put up a full auto scan or Jack will chew your ass!!

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  4. #3
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    Sorry, I wrote that from my desktop and I have to use my crappy old laptop for the VCDS.

    Autoscan with car off. Plugs and coils are currently removed from motor.


    Code:
    Sunday,12,November,2017,14:53:54:02058
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 17.8.0.1 (x64)  HEX-V2 CB: 0.4401.4
    Data version: 20170721 DS276.2
    www.Ross-Tech.com
    
    
    VIN: WAUBF78E96A049522   License Plate: AUDISPARKPLUGREMOVED
    Mileage: 210860km-131022mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
              67 69 75 76 77
     
    VIN: WAUBF78E96A049522   Mileage: 210860km-131022miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels:. 06F-907-115-AXX.clb
       Part No SW: 8E0 910 115 M    HW: 8E0 907 115 D
       Component: 2.0l R4/4V TFSI     0070  
       Revision: --H10---    Serial number:               
       Coding: 0104010A02070120
       Shop #: WSC 25169 444 57715
       VCID: 2B000F0B9F05B0FFDE8-807E
    
    2 Faults Found:
    000768 - Random/Multiple Cylinder Misfire Detected 
                   P0300 - 001 - 
                 Freeze Frame:
                        Fault Status: 01100001
                        Fault Priority: 0
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 210864 km
                        Time Indication: 0
    
                 Freeze Frame:
                        RPM: 1242 /min
                        Load: 54.9 %
                        Speed: 0.0 km/h
                        Temperature: 24.0°C
                        Temperature: 8.0°C
                        Absolute Pres.: 990.0 mbar
                        Voltage: 13.589 V
    
    000769 - Cylinder 1 
                   P0301 - 001 - Misfire Detected
                 Freeze Frame:
                        Fault Status: 01100001
                        Fault Priority: 0
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 210864 km
                        Time Indication: 0
    
                 Freeze Frame:
                        RPM: 1303 /min
                        Load: 47.8 %
                        Speed: 0.0 km/h
                        Temperature: 24.0°C
                        Temperature: 8.0°C
                        Absolute Pres.: 990.0 mbar
                        Voltage: 13.716 V
    
    Readiness: 0110 0101
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01J-927-156.lbl
       Part No SW: 8E3 910 155 C    HW: 01J 927 156 HT
       Component: V30 01J 2.0TFSI USA 0010  
       Revision: 00000011    Serial number: 00000001230498
       Coding: 0000001
       Shop #: WSC 04940 001 00001
       VCID: 280AF0078EF39BE733A-807C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8E0-910-517.clb
       Part No SW: 8E0 910 517 D    HW: 8E0 614 517 AK
       Component: ESP8 front      H04 0120  
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0004525
       Shop #: WSC 06335 000 00000
       VCID: 280AF0078EF39BE733A-807C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
       Part No: 8E0 820 043 AM
       Component:   A4 Klimaautomat   2831  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 6C82CC175F9B77C7972-50D0
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl
       Part No: 8E0 907 279 L
       Component: int. Lastmodul  USA 0504  
       Coding: 01023
       Shop #: WSC 65536  
       VCID: 3B203F4B6A75207F4E8-4AC2
    
    1 Fault Found:
    02745 - Bulb for Daytime Running Light; Left 
                30-00 - Open or Short to Plus
    
    -------------------------------------------------------------------------------
    Address 0F: Digital Radio        Labels: 8E0-035-593-XM.lbl
       Part No SW: 8E0 035 593 E    HW:             
       Component: SDAR XM              
       Revision:             Serial number: AUZ4Z7E2027995
       Shop #: WSC 00000 000 00000
       VCID: 2B000F0B9F25B0FFDE8-5160
    
    1 Fault Found:
    02635 - Tuner Not Enabled/Activated 
                000 -  - 
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 8E0-959-655-94.lbl
       Part No SW: 8E0 959 655 H    HW: 8E0 959 655 H
       Component:    Airbag 9.41  H11 3540  
       Revision: 91H1135    Serial number: 0036N000RJTL  
       Coding: 0032607
       Shop #: WSC 06335 000 00000
       VCID: 3C223C576A6B2747472-8068
    
       Subsystem 1 - Part No: 8E0 910 339 B
       Component: BF-Gewichtsens. 002 0070
    
       Subsystem 2 - Serial number: 33SDE         
    
       Subsystem 3 - Serial number: 0001.01.000000200000000000˙†63
    
       Subsystem 4 - Serial number: 000000˙†6332DRB401CD0D1F ˙†63
    
       Subsystem 5 - Serial number: D0D1F ˙†6342DRB401C046A5M˙†63
    
       Subsystem 6 - Serial number: 046A5M˙†6352ARB40086D69BZ˙†63
    
       Subsystem 7 - Serial number: 6D69BZ˙†6362ARB400863E41J˙†63
    
       Subsystem 8 - Serial number: 63E41J˙†63729RB4008CF9B0 ˙†63
    
       Subsystem 9 - Serial number: CF9B0 ˙†63829RB4008CFA06Z˙
    
       Subsystem 10 - Serial number: CFA06Z˙
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 8E0-953-549.lbl
       Part No: 8E0 953 549 Q
       Component: Lenksáulenmodul     0601  
       Coding: 04141
       Shop #: WSC 06335  
       VCID: 41DC4DA308994AAF144-4AC2
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8E0 920 982 F    HW: 8E0 920 982 F
       Component: KOMBI+WFS 4     H12 0110  
       Revision: 0110        Serial number: 00000000000000
       Coding: 0022261
       Shop #: WSC 02101 444 999999
       VCID: 313C1D63BD39DA2FE44-50F4
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8E0 920 982 F    HW: 8E0 920 982 F
       Component: KOMBI+WFS 4     H12 0110  
       Revision: 0110        Serial number: 00000000000000
       Coding: 0022261
       Shop #: WSC 02101 444 999999
       VCID: 313C1D63BD39DA2FE44-50F4
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb
       Part No: 8E0 959 433 BT
       Component: Komfortgerát T7B    3332  
       Coding: 11836
       Shop #: WSC 06335  
       VCID: 045284B7570B9F877F2-4AC2
    
       Subsystem 1 - Part No: 8E1959801G
       Component: Tőrsteuer.FS BRM 0406  
    
       Subsystem 2 - Part No: 8E1959802E
       Component: Tőrsteuer.BF BRM 0205  
    
       Subsystem 3 - Part No: 8E0959801A
       Component: Tőrsteuer.HL BRM 0205  
    
       Subsystem 4 - Part No: 8E0959802A
       Component: Tőrsteuer.HR BRM 0205  
    
    3 Faults Found:
    00962 - Alarm via. Tilt Sensor 
                35-00 -  - 
    01374 - Alarm triggered by Terminal 15 
                35-00 -  - 
    01572 - Alarm triggered by Door Contact Switch; Passenger Side 
                35-00 -  - 
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4F0-910-357.lbl
       Part No SW: 4F0 910 357 C    HW: 4F0 907 357 C
       Component: AFS 1           H01 0030  
       Revision: 00000001    Serial number:               
       Coding: 0000019
       Shop #: WSC 22130 444 64374
       VCID: 2616FE3F84E78D97016-8072
    
       Subsystem 1 - Part No: NOSUBSYSTEM 
       Component: AFS-Modul links         
    
       Subsystem 2 - Part No: NOSUBSYSTEM 
       Component: AFS-Modul rechts        
    
    1 Fault Found:
    02071 - Local Databus 
                004 - No Signal/Communication - MIL ON
                 Freeze Frame:
                        Fault Status: 11100100
                        Fault Priority: 2
                        Fault Frequency: 254
                        Reset counter: 40
                        Time Indication: 0
    
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 8E0-035-192-RNSE.clb
       Part No SW: 8E0 035 192 F    HW: 8E0 035 192 F
       Component: RNS-E US        H70 0260  
       Revision:      01S    Serial number: AUZBZ7E2001534
       Coding: 0301637
       Shop #: WSC 06335 000 00000
       VCID: 2708F33B83CD949F3A0-5160
    
    2 Faults Found:
    00446 - Function Limitation due to Under-Voltage 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 147
                        Time Indication: 0
                        Date: 2014.09.02
                        Time: 07:40:45
    
                 Freeze Frame:
                        Voltage: 11.50 V
                        Mileage: 655350 km
                        Count: 65535
                        Clock: 255:255
    
    00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
                011 - Open Circuit - Intermittent
                 Freeze Frame:
                        Fault Status: 00101011
                        Fault Priority: 5
                        Fault Frequency: 254
                        Reset counter: 145
                        Time Indication: 0
                        Date: 2012.09.14
                        Time: 08:26:07
    
                 Freeze Frame:
                        Mileage: 655350 km
                        Count: 1111
                        Clock: 17:30
    
    
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: 8P0-862-335.lbl
       Part No SW: 8P0 862 335 J    HW: 8P0 862 335 J
       Component: FSE_255x BT     H26 0290  
       Revision: 00000000    Serial number: 00000005016937
       Coding: 0001677
       Shop #: WSC 22130 444 84210
       VCID: 3D24315371612E4F70C-50D0
    
    No fault code found.
    
    End----(Elapsed Time: 04:26, VBatt start/end: 11.4V/11.4V. VIgn 11.4V)-----

  5. #4
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    Quote Originally Posted by derek18105 View Post
    Hello, I have a 2006 Audi A4 2.0T FWD with the CVT transmission. It has 131,000 miles.

    I have VCDS and it is pulling two codes

    16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
    16685/P0301/000769 - Cylinder 1 Misfire Detected


    Symtoms:

    The car starts without too much hesitation, but when cold the whole car shakes pretty hard. I believe it is definitely running on 3 cylinders when cold. But once the car warms up, it doesn't shake anywhere near as bad and drives okay. There is still hesitation but the vibration is reduced greatly, and I was able to drive it 30 miles home without much of an issue. I've drove a Toyota Camry before with only 3 of 4 cylinders running and it barely had enough power to do the speed limit.

    The CEL flashes when the car is first started and the engine is cold, but once it warms up the CEL becomes solid and stays lit.



    Things I have done trying to solve the problem:

    I switched cylinder 1 and 4 coils, cleared the codes, and started the engine again. Eventually the same codes came back on. To me this rules out the coil, but I might change them all just to be safe. At least one of them has been changed before as it does not have numbers written on the top like the other 3 do. I pulled all the spark plugs and they all look rather similar. Light brown color on all of them. They are Autolite plugs (im not a fan) and will be changing those too, but I don't believe they are the problem.



    The previous owner took it to a mechanic and he said it was carbon buildup on the valves. I haven't looked into this much yet but I do know that carbon buildup is a common problem on cars with direct injection, but I am unsure if that could cause this misfire. I will look more into that and how hard it is to clean them. I don't want to pull the whole head off if I don't have to.

    Looking at Ross-Tech Wiki, it could be a lot of things causing this but I was hoping someone would have some input.

    Thanks for your help!

    -Derek
    Don't know what Jack recommends, most people use walnut shell blaster for doing valves, in many cases head stays on, about the only way I know to do it, but i don't own one of the problematic GDI motors.

    I would do this right out of the gate, as sounds like it needs to be done, then go from there. You might get in and find the rumor was false, is so good.

    I have buddies with mini coopers, they do it routinely, about every 20,000 miles.

  6. #5
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    Part No SW: 8E0 910 115 M HW: 8E0 907 115 D
    Component: 2.0l R4/4V TFSI 0070 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Firmware Update required 0080 or higher!


    JPPSG........
    http://forums.ross-tech.com/showthre...uot-JPPSG-quot


    Compression check compare across entire engine bank?

    Check grounds and wire harness to coil packs.

    Swap or change spark plugs as part of isolation strategy



    Report............?

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  7. #6
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    Do cylinder leakdown test and compare cold engine/warm engine, also if leakage is high you must find where is leaking. I had same symptoms and issue, cold engine with misfires, warm engine with no misfires. Warm cylinder was leaking about 20 %, and cold was leaking about 60%. Exhaust valve on 3. cylinder was worn. This is just example.

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  9. #7
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    Okay, I have switched the spark plug location to rule out both the spark plugs and the ignition coils.

    Compression test looked good. It was preformed on a slightly warm engine.

    Cylinder 1: 180 PSI
    Cylinder 2: 175 PSI
    Cylinder 3: 185 PSI
    Cylinder 4: 190 PSI

    They look pretty good to me but I will check again when the engine is completely cold to see if it makes a difference.



    I still need to look into the coil wiring and ground. I will have to do some research to figure out how to check that. That will be my next step.

    I also was running the advanced measuring value mode on VCDS and noticed that the engine consistently misfired when cold and at idle. It still misfired at idle when it was warm but not as often. It would also misfire at higher RPM here and there but it was sporadic. This was all done in Park so there was no load on the engine. But it was always and only Cylinder 1 with the misfire.


    As of now I will look into the coil wiring, then do a cold compression test, and then maybe pull the intake manifold to check out the injectors and carbon buildup on valves.


    Thanks for your help

  10. #8
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    It's better to do leakdown test with cold engine. With compression test on warm engine you don't know where it's leaking. And try to do compression test when engine is cold (after 10 hours).
    Also check power and ground of ECU and all sensors.
    Have you checked injectors? Maybe there is some issue.
    Last edited by Davor Sule; 11-14-2017 at 02:37 PM.

  11. #9
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    Also try to measure vacuum of engine before taking engine head off. Neddle of vacuum gauge should be stabile if valves are good, if not neddle twitches.
    You have to consider that valve lifters can cause this if they don't work in good order.
    Last edited by Davor Sule; 11-14-2017 at 03:00 PM.

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