COMPRESSION, CHECKING
Special tools and workshop equipment required
- Spark Plug Removal Tool 3122 B
- Ignition Coil Puller T40039
- Compression Tester V.A.G 1763
Test Sequence
Note. Engine oil temperature min. 30 °C (86 °F) Battery voltage at least 12.7 V
Disconnect the electrical connector on the mass airflow (MAF) sensor -G70- -3-.
Scheme 518
Open clips -1 and 2- and remove air guide hose from MAF sensor.
Remove front air intake connector on lock carrier -4-.
Remove engine cover.
Remove the ignition coils with power output stage. Refer to Removal and Installation .
Remove spark plugs, using the 3122 B.
Disconnect 8-pin connector from fuel injectors. Refer to Removal and Installation
Check compression using the 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 sparks plugs.
Install ignition coils with power output stage. Refer to Removal and Installation .
Note. By separating the connections, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the fault memory and erase, if necessary.
Read out ECM DTC memory. Vehicle diagnostic, testing and information system VAS 5051 in "Guided Fault Finding" function.