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

- Disconnect the electrical connector on the mass airflow (MAF) sensor (G70) - 3 -.






- Open clips - 1 and 2 - and remove air guide hose from MAF sensor.

- Remove front air intake connector on lock carrier - 4 -.

- Remove engine cover.

- Remove the ignition coils with power output stage.

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

- Disconnect 8-pin connector from fuel injectors.

- Check compression using the (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 sparks plugs.

- Install ignition coils with power output stage.

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

- Read out ECM DTC memory. Vehicle diagnostic, testing and information system VAS 5051 in "Guided Fault Finding" function.