Compression Check: Testing and Inspection

Compression, Checking

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)

• Adapter (V.A.G 1381/5A)

When doing any repair work, especially in the engine compartment, pay attention to the following due to clearance issues:

• Route lines of all types (for example, fuel, hydraulic, Evaporative Emission (EVAP), coolant, refrigerant, brake fluid and vacuum) and electrical wiring so that the original path is followed.

• To prevent damage to the lines, make sure there is sufficient clearance to all moving or hot components.

Test Conditions:

• The engine oil temperature must be at least 30 °C (86 °F).

• The voltage supply is OK.

- Remove the air filter (engine cover). Refer to => [ Air Filter and Engine Cover ] Air Filter and Engine Cover.

- Disconnect the connectors from all the fuel injectors.

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

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

- Check the compression using the compression tester (V.A.G 1763) and the adapter (V.A.G 1381/5A).

• Using the tester, refer to the operating instructions.

- Have a second technician operate the starter.

- Operate the starter until the tester shows no further pressure increase.

Compression Pressure:






- Erase the Engine Control Module (ECM) Diagnostic Trouble Code (DTC) memory after the procedure is finished, otherwise a fault will be stored when the connector was disconnected.