Compression Check: Testing and Inspection

Compression Test

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)

Requirements

• 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.

- Disconnect the electrical connectors - arrows - from the ignition coils.






- Remove the ignition coils using the ignition coil puller (T40039).






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

- Check compression using the compression tester (V.A.G 1763) and the adapter (V.A.G 1763/6).

• Using the 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, for the tightening specification, refer to => [ Ignition System Component Overview ] Service and Repair.

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

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

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