A4/A6 Docs: Idle Vibration Issues (Solution)

The engine vibrates/shakes when idling. The engine vibrations are noticeable throughout the vehicle.

Cause:
One or more injector units are out of specification and running "rich." The idle speed control system attempts to compensate for the overly rich mixture by reducing the injection quantity to its minimum value (-3.01 mg/H). The significant differences in injection quantities cause the rough idle. Typically, no error code is stored. (Only applies to AWX/AVF engines with 96 kW in the A4 and A6 models).


Changes:
Type 8E20N4, starting from serial number 8E52A-132795 (AWX - engine).
Type 8E50NC, starting from serial number 8E92A-136686 (AVF engine).
Type 4B2064, starting from serial number 4B52N-055723.


Solution:
Analyze measurement block 13 with the engine running at operating temperature and idling. If a value is significantly negative or at the limit (-3.01), all four injectors must be replaced to avoid repeated repairs. Part number: 038 198 073 (set of 4 injectors).

Sure, here is the translation of the text from German to English:

"Note: "
Do not use part numbers with the index Q or AN. For vehicles of model year 01 (without WIV), an additional 4 other rocker arms, part number 038 109 451 B, must be ordered. To prevent damage to the rocker arm shaft after only a few kilometers, it is essential to adjust the rocker arms using a dial indicator.