Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122B)

• Ignition coil puller (T40039)

• Torque wrench 5-50 Nm (VAG 1331)

• Compression tester (VAG 1763) with Adapter (VAG 1763/6)

Test Conditions

• Engine oil temperature must be at least 30 °C.

• Battery voltage at least 12.7 V

Test Sequence

• Observe the safety precautions. Refer to --> [ Safety Precautions ] Safety Precautions.

- Remove the ignition coils with the power output stages. Refer to --> [ Ignition Coils with Power Output Stages ] Service and Repair.

- Remove the spark plugs using the (3122B).

- Check compression using the (VAG 1763) and the (VAG 1763/6).

• Using tester, refer to --> operating instructions.

- Activate the starter until no further pressure increases are indicated by the (VAG 1763).

Compression Pressure

• New: 11.0 to 14.0 bar pressure.

• Wear limit: 7.0 bar pressure.

• Permissible difference between all cylinders: Max. 3 bar.

- Install the spark plugs. Refer to --> [ Ignition Assembly Overview ] Service and Repair.

- Install the ignition coils With power output stages. Refer to --> [ Ignition Coils with Power Output Stages ] Service and Repair.

• By disconnecting the connectors, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the fault memory and erase, if necessary.

- Check the Engine Control Module (ECM) DTC memory and erase all DTC entries which may have occurred during assembly.

• If the DTC memory was erased, generate a readiness code.