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)

Test Sequence:

• Observe the safety precautions, refer to => [ Safety Precautions ] Safety Precautions.

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

• Battery voltage at least 12.7 volts.

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

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





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





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

- Check the compression using compression tester (V.A.G 1763) and 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, 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 separating the connections, 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 using the vehicle diagnostic tester.