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Audi A6 2005 and later (C6) 2005 Audi A6 4.2 suddenly running very rough. Where to start?


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ProtoFly

Posts: 2
Registered: 04/03/13
2005 Audi A6 4.2 suddenly running very rough. Where to start?
Posted: Apr 3, 2013 8:19 AM
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2005 4.2, while driving to church on Sunday, I felt what could be described as a 'bump' - almost like a bump in the road, but the road was smooth. Immediately, I knew the engine was not running properly, and a few moments later, flashing engine light. Nursed it to church and home, running very rough, shaking badly at idle.

I don't see/hear any vacuum leaks, and the 'bump' and with the small rattle on startup that it has had (plus mileage), and I'm thinking that perhaps a tensioner just went and threw a bit of plastic into the chain, and now one bank is out of whack.

I cross posted this to the 4.2 engine forum, hoping for some other ideas, but if anyone has suggestions on where to start, I'd be very thankful.

Here's a partial scan from VCDS with the tasty bits:

VIN: WAUDL74F15NXXXXXX Mileage: 265760km/165135miles

Address 01: Engine Labels: None
Part No SW: 4F0 910 560 A HW: 4F0 907 559
Component: 4.2L V8/5V G 0010
Revision:
Serial number:
Coding: 0007772
Shop #: WSC 02335 785 00200
VCID: 2045F75CF3C6B41801C

9 Faults Found:
18061 - Please check DTC Memory of ABS Controller
P1653 - 008 - - Intermittent
18061 - Please check DTC Memory of ABS Controller
P1653 - 008 - - Intermittent
17538 - Fuel Trim; Bank 2 (Mult)
P1130 - 001 - System too Lean
16558 - Fuel Trim; Bank 2
P0174 - 001 - System Too Lean
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 - 001 - Misfire Detected - MIL ON
16688 - Cylinder 4
P0304 - 001 - Misfire Detected - MIL ON
Readiness: 0000 0000

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