Compression Check: Testing and Inspection

Compression Pressure, 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)

• Adapter (V.A.G 1381/1)

Sequence

• Follow all safety precautions. Refer to => [ Safety Precautions ] Safety Precautions.

• Engine oil temperature is a minimum of 30 °C (86 °F).

• Battery voltage is at least 12.7 volts

Procedure

- Remove the engine cover. Refer to => [ Engine Cover ] Engine Cover.

- Remover the ignition coils with the power output stages. 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 adapters (V.A.G 1381/1) and (V.A.G 1381/5A).






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

- Operate the starter until the tester no longer indicates that the pressure is increasing.

Compression Pressure






- Install the sparks plugs, tightening specification, refer to => [ Ignition System Component Overview ] Service and Repair.

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

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

- Read the Engine Control Module (ECM) DTC memory. Refer to the vehicle diagnostic tester.