Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122 B)

• Compression tester (V.A.G 1763)

Procedure

• Engine oil temperature at least 30° C.

• Battery voltage at least 12.5 V.

- Switch off ignition.

- Disconnect electrical connector - arrow - for Engine Speed (RPM) sensor (G28).





- Remove ignition coils.

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

- Check compression pressure with compression tester (V.A.G 1763); => Operating instructions.

- Have a second person completely depress gas pedal and operate starter long enough until tester no longer indicates increase in pressure.

- Repeat procedure on each cylinder.






Assembly is in reverse order of removal, note the following:

- Install spark plugs.

- Install ignition coils.

If connectors and fuse were removed, malfunctions are saved in Engine Control Module (ECM).

- Connect vehicle diagnosis, testing and information system (VAS 5051B).

- Start "Guided Functions" operating mode.

- Generate readiness code in ECM.