Compression Check: Testing and Inspection

Compression pressures, checking





Special tools and equipment
^ 3122B Spark plug removal tool
^ VAG1331 Torque wrench (5-50 Nm)
^ VAG1763 Compression tester





- Remove fuse 32.

Note: Removing fuse 32 interrupts the voltage supply to the injectors.

Test conditions
^ Engine oil temperature must be at least 30°C.

Work sequence
- Remove engine cover.
- Pull connector(s) off ignition coils.
- Remove ignition coils.
- Remove spark plugs with spark plug removal tool 31 22B.
- Fully open throttle valve.

Note: Using the compression tester Operating instructions.

- Check compressions with compression tester VAG1381 / VAG1763.
- Operate starter until tester shows no further pressure increase.

Compression pressure:
^ New: 10-14 bar
^ Wear limit: 7.0 bar
^ Permissible difference between all cylinders: 3 bar

- Thread in spark plugs with spark plug socket and extension 3122B and tighten to 30 Nm.

Vehicles with engine code: APH
- Install ignition coils and tighten to 10 Nm.

Vehicles with engine codes: AWP, AWV
- Install ignition coils. During this, make sure ignition coils are securely seated.

Continued for all vehicles
- Check DTC memory.
- Read readiness code.
If the DTC memory has been erased or the Engine Control Module separated from permanent (battery) positive, the readiness code must be generated again.