Compression pressures, checking
WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Special tools, testers and auxiliary items required
- Compression tester V.A.G 1763
- Spark plug removal tool 3122 B
- Ignition Coil Puller T40039
- Spring-type clip pliers VAS 5024 A
Test sequence
NOTE:
- Engine oil temperature min. 30 °C
- Battery voltage at least 12.7 V
- Remove engine cover - arrows -.
- Remove bolts - 1 -.
- Disconnect connector - 2 - from ignition coils and free up cable.
- Remove ignition coils with power output stages - 2 - using Ignition Coil Puller T40039.
- Remove spark plugs, using spark plug removal tool 3122 B.
- Disconnect 8-pin connector from fuel injectors. Refer to 8-pin harness connector for fuel injectors under Component locations beneath intake manifold
- Check compression using compression tester V.A.G 1763 and adapter V.A.G 1763/6.
NOTE:
- Using tester: Operating instructions
- Operate starter until tester shows no further pressure increase.
Compression pressure:
| New bar positive pressure | Wear limit bar positive pressure | Difference between cylinders bar positive pressure |
|---|---|---|
| 11.0 to 14.0 | 7.0 | max. 3.0 |
- Install spark plugs and ignition coils.
- Read out ECM DTC memory Vehicle Diagnostic, Testing and Information System VAS 5051 in "Guided Fault Finding" function
NOTE:
- By separating the connections, DTCs are stored to memory. After the test, check fault memory and erase, if necessary.
Torque specifications
| Component | Nm |
|---|---|
| Spark plugs in cylinder head | 30 |