COMPRESSION PRESSURE, CHECKING
Special tools and workshop equipment required
- Spark Plug Removal Tool 3122 B
- Ignition Coil Puller T40039
- Compression Tester V.A.G 1763
- Adapter V.A.G 1763/6
Test Sequence
Note. Engine oil temperature min. 30 °C (86 °F) Battery voltage at least 12.7 V
Remove the engine cover -arrows-.
Scheme 129
Disconnect the electrical connectors -arrows- on ignition coils.
Scheme 130
Remove the ignition coils with the T40039.
Scheme 131
Remove the spark plugs using a 3122 B.
Check compression using 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. Refer to SPARK PLUGS, REMOVING AND INSTALLING .
Install the ignition coils with output stages. Refer to IGNITION COILS WITH POWER OUTPUT STAGES .
Note. By separating the connections, DTCs are stored to memory. After the test, check the DTC memory and erase, if necessary.
Check the engine control module DTC memory Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding".