Compression Check: Testing and Inspection

Compression pressure, checking





Special tools, equipment, test and inspection devices; required accessories
- 3122 B Spark plug removal tool
- T10029 Spark plug connector tool
- VAG 1331 Torque wrench (5-50 Nm)
- VAG 1763 Compression tester

Test condition
- Engine oil temperature must be at least 30°C.
- Battery voltage must be at least 11.5 V.

Test procedure
- Disconnect connector from heating resistor (N79) and remove intake hose between upper half of air filter and throttle control unit (J338) together with crankcase purge valve.
- Use assembly tool T10029 to remove spark plug connector and ignition lines.
- Remove engine cover.
- Remove spark plugs with spark plug tool 3122 B.





- Disconnect 5-pin connector from ignition coil (N152).





- Disconnect fuse no. 32 from fuse block.

Note: By removing fuse 32, the voltage feed to the injector valves is interrupted.

- Completely depress accelerator pedal for wide open throttle.
- Check compression pressure with compression pressure tester VAG 1763.

- Crank engine until tester no longer shows an increase in pressure.

Compression pressure readings:
New: 10 - 13 bar
Max. wear: 7.5 bar
Permissible variation between all cylinders: 3 bar