2013 Audi A4, Intermittent misfire that has occurred since I bought the car, info?

[Popperoni]

Hello All,

I was finally able to get my hands on a VCDS cable, after recently replacing a leaking fuel injector on cylinder 3 I figured I would run some tests to make sure I did it right and everything was good. After doing some logging, I noticed that every 3-5 minutes at idle, the car will misfire. It is typically cylinder 1 or 2 when it happens at idle. It never happens enough to trigger a CEL or anything, the only way I am able to tell is by the slight vibration the car makes. This has been ongoing since the night I bought the car. I never knew what that slight half-second vibration was until now, being that the data shows it. When the engine is cold and in low gears, cylinder 4 will once in a great while misfire, I can't even feel it, the logging software captured it.

For some reason, I cannot upload my text documents so I will just paste the text in here. I cut down most of the unimportant stuff, I know I have a brake malfunction and radio malfunction (just a Sirius XM controller), but I find it hard to believe that those could be an issue regarding this, I'll save that for a different post.

Sunday,18,April,2021,12:43:44:46821
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.3.0.0 (x64)  HEX-V2 CB: 0.4543.4
Data version: 20210226 DS325.0
www.Ross-Tech.com


VIN: WAUFFAFL3DN039297   License Plate: 
Mileage: 129450km-80436mi   Repair Order: 



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Chassis Type: FL-AU48 (8R0)
Scan: 01 02 03 05 08 09 15 16 17 19 2E 36 42 44 46 47 52 53 56 62
          72 77

VIN: WAUFFAFL3DN039297   Mileage: 129450km-80436miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: Malfunction 0010
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (DET-CPMA)       Labels:. 06H-907-115-CDN.clb
   Part No SW: 8K5 907 115 F    HW: 8K2 907 115 L
   Component: 2.0l R4/4V TF H09 0008  
   Revision: ECH09---    
   Coding: 4A2A0013242600062000
   Shop #: WSC 29043 001 1048576
   ASAM Dataset: EV_ECM20TFS0118K5907115F 001009
   ROD: EV_ECM20TFS0118K5907115F.rod
   VCID: 35372B00C5CA18F36C5-8060

No fault code found.
Readiness: 0000 0000

And here is a snippet of the engine misfires.

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                Address 01: Engine  (8K5 907 115 F)

11:47:23
  IDE00021   Engine RPM 759 /min
  IDE00075   Vehicle speed 0 km/h
  IDE00090-ENG57549   selected gear-Bits 0-7 0 
  IDE00100   Engine torque 26.5 Nm
  IDE01975   Numb.of misfir.: cylinder 1 5111 
  IDE01976   Numb.of misfir.: cylinder 2 5913 
  IDE01977   Numb.of misfir.: cylinder 3 3518 
  IDE01978   Numb.of misfir.: cylinder 4 1457

I am also attaching the log file, via google docs. I highlighted the misfire points.

https://drive.google.com/file/d/1ail...ew?usp=sharing

So, I have two questions.

1, Is it common to have this many misfires on an engine with 80k miles? Am I being overzealous?

2, This has been ongoing since I bought the car when I am driving the car at highway speeds, up to 6k RPM, not a peep from the cylinders. It seems only apparent when the engine is either cold or at low RPM. (see google sheets to see what I mean), do you have any idea what could be causing this?

I always figured that if an engine is misfiring, do not drive it. So the number of misfires from the log kinda scare me, as I have owned this car for 6 months and have been driving it regularly. I am ruling out fuel injectors and spark plugs, as I just changed all of that 250-300 miles ago, and the power and fuel economy is perfectly within spec. The car literally drives fine, had I not logged on VCDS I would have had no idea that the engine was misfiring.

Thank you, I really appreciate it.

[imthecleanup]

Have you tried changing the coil packs when you did the spark plugs?

[Popperoni]

Have you tried changing the coil packs when you did the spark plugs?

I have not tried changing the coil packs yet, I replaced them last sunday, 8 days ago.

[flowhigh]

If that's during or after cold startup like I think you mentioned it's completely normal. It gets more frequent in colder weather and if you have a lot of carbon buildup.