Compression Check: Testing and Inspection

Compression, Checking





Special tools, testers and auxiliary items required

• Spark plug removal tool (3122 B)

• Puller (T40039)

• Torque Wrench (V.A.G 1331)

• Compression tester (V.A.G 1763)

Test Sequence

• Observe safety precautions => [ Safety Precautions ] Service Precautions.

• Engine oil temperature min. 30 °C (86 °F)

• Battery voltage at least 12.7 V

Proceed as follows:

- Remove the engine cover => [ Engine Cover, Removing and Installing ] Engine Cover, Removing and Installing.

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





- Remove the ignition coils with the puller (T40039).





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

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

• Using tester: => Operating Instructions.

- Operate starter until tester shows no further pressure increase.

Compression pressure:





- Install the sparks plugs, tightening specification => [ Ignition, Assembly Overview ] Removal and Replacement.

- Install ignition coils with power output stage => [ Ignition Coils with Power Output Stages, Removing and Installing ] Service and Repair.

• By separating the connections, DTCs are stored to memory. After the test, check the fault memory and erase, if necessary.

- Read the engine control module DTC memory => vehicle diagnostic tester.