Compression Check: Testing and Inspection

Compression pressure, checking





Special tools, workshop equipment, test and measuring appliances and aux. items required
^ 3122 B Spark plug spanner
^ V.A.G 1331 Torque wrench (5 to 50 Nm)
^ V.A.G 1763 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 spanner 3122B.
- Use a second mechanic to fully depress accelerator pedal.
- Check compressions with compression tester V.A.G 1381N.A.G 1763.

Note: Using the compression tester = Operating instructions.

- Operate starter until tester shows no further pressure increase.

Compression pressure:
New: 10 to 14 bar
Wear limit: 7.0 bar
Permissible difference between all cylinders: 3 bar
- Install spark plugs with spark plug socket and extension 3122B and tighten to 30 Nm.

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

Vehicles with engine codes AWP, AWW
- Install ignition coils. During this, make sure secure seating of the ignition coils.

Continued for all vehicles
- Check DTC memory.
- Read out readiness code.
- If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated again.