Compression Check: Testing and Inspection

Compression, checking





Special tools and equipment required

^ Spark plug socket 3122 B
^ Compression tester V.A.G. 1763
^ Puller T10095 A
^ Assembly tool T10118

Conditions

^ Engine oil temperature at least 30 degrees C
^ Battery voltage at least 12.7 V

Work sequence

- Switch off ignition.





- Remove fuel pump fuse from slot No. 28.





- Disconnect electrical connectors at ignition coils by releasing tab (arrow) with assembly tool T10118 and carefully pulling connector.





- Attach puller T10095 A to ignition coils as shown in illustration (arrow) and remove ignition coils one at a time.
- Remove spark plugs with spark plug wrench 3122 B.
- Check compression pressure with compression tester V.A.G. 1763.

Note:
For use of compression tester Go to tester operating instructions.

- Have a second technician press down accelerator pedal completely and simultaneously operate starter until pressure no longer increases on tester display.

Compression pressure





Installation is performed in the reverse order. Note the following:

- Upon completion of compression test, interrogate and erase engine control module fault memory. Faults will have been stored during fuse removal and connector separation. Use vehicle diagnostic, testing and information system VAS 5051 A.

Tightening torque