15 Rattle/knocking noise from camshaft adjuster at engine start
15 08 16 2010294/5 November 21, 2008. Supersedes Technical Service Bulletin Group 15 number 07-03 dated July 7, 2007 for reasons listed below.
| Model(s) | Year | VIN Range | Vehicle-Specific Equipment |
|---|---|---|---|
| TT | 2000 – 2006 | All | 1.8T Engine |
| A4 | 1997 – 2005 | All | |
| A4 | 1998 – 2001 | All | 2.8 V6 Engine |
| A4 | 2000 – 2002 | All | 2.7T V6 Engine |
| A4 | 2002 – 2006 | All | 3.0 V6 Engine |
| A4 Cabriolet | 2002 – 2006 | All | |
| A4 Cabriolet | 2003 – 2006 | All | 1.8T Engine |
| A6 | 1998 – 2001 | All | 2.8 V6 Engine |
| A6 | 2000 – 2004 | All | 2.7T V6 Engine |
| A6 | 2002 – 2004 | All | 3.0 V6 Engine |
| A6 | 2000 – 2004 | All | 4.2 V8 Engine |
| allroad | 2001 – 2005 | All | 2.7T V6 Engine |
| A8 | 2001 – 2003 | All | 4.2 V8 Engine |
| A8 | 1997 – 1999 | All | 3.7 V8 Engine |
| A8 | 1997 – 1999 | All | 4.2 V8 Engine |
| A8 | 2006 | All |
Condition
| REVISION HISTORY | ||
|---|---|---|
| Revision | Date | Purpose |
| 5 | – | Revised Title to include Repair Group |
Rattle or knocking noise from camshaft chain tensioner(s) or camshaft adjuster(s) for 1-2 seconds after engine start.
Technical Background
The camshaft adjustment is hydraulically actuated and controlled by the engine oil pressure. If the engine has been turned off for a long time, the oil pressure drops down and the oil partially flows back into the oil sump.
To ensure an efficient camshaft adjustment right after an engine cold start, the oil pressure inside the camshaft adjusters must be built up as fast as possible. During this time, a rattle or knocking noise may be noticeable.
This noise is normal at engine start and will last until the oil pressure is fully built up, which takes about 1-2 seconds.
Service
Do not replace the Camshaft Tensioner(s) or Camshaft Adjuster(s) for a noise concern as described above.
Replacing the Camshaft Tensioner(s) or Camshaft Adjuster(s) will not eliminate this noise.
Warranty
This TSB is informational only and not applicable to any Audi
warranty.
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.
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