Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark Plug Removal Tool (3122 B)

• Ignition Coil Puller (T40039)

• Compression Tester (V.A.G 1763)

Test Sequence

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

• Battery voltage at least 12.7 V

- Remove the engine cover - arrows -.






- Release and disconnect the electrical connectors on all the ignition coils.

- Remove the ignition coils with the (T40039).






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

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

• Using tester, see Operating Instructions.

- Operate starter until tester shows no further pressure increase.

Compression Pressure:






- Install spark plugs.

- Install the ignition coils with output stages.

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

- Check the Engine Control Module (ECM) DTC memory. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding".