Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark Plug Removal Tool (3122 B)

• Ignition Coil Puller (T40039)

• Torque Wrench (5-50 Nm) (V.A.G 1331)

• Compression Tester (V.A.G 1763)

• Adapter (V.A.G 1381/5A)

Test Conditions:

• Engine oil temperature must be at least 30 °C (86 °F).

• Voltage supply is OK.

Procedure

- Remove the engine cover/upper air filter housing. Refer to => [ Engine Cover/Upper Air Filter Housing ] Engine Cover/Upper Air Filter Housing.

- Remove the ignition coils with power output stage. Refer to => [ Ignition Coil with Power Output Stage ] Service and Repair.

- Remove the spark plugs using the spark plug removal tool (3122 B).

- Check the compression using the compression tester (V.A.G 1763) and the adapter (V.A.G 1381/5A).

• Using the compression tester, refer to the operating instructions.

- Have a second technician operate the starter.

- Operate the starter until the tester shows no further pressure increase.

Compression Pressure:






- To conclude work, check the Diagnostic Trouble Code (DTC) memory of the Engine Control Module (ECM), erase all DTC entries which may have occurred during the tests and repairs.

• Generate a readiness code if the DTC memory was erased. Refer to "Guided Function" in the vehicle diagnosis, testing and information system VAS 5051.