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)

• Puller (T10166)

Test Conditions

• Engine oil temperature min. 30° C.

• Battery voltage at least 12.5 V.

Test Sequence

- Switch off ignition.

- Pry off right cover on the instrument panel, using a screwdriver - arrow -.





- Remove fuse 29 (on fuse panel C) (SC29) in the right instrument panel fuse panel, position - 29 -.





- Remove intake manifold side sections => [ Left Intake Manifold Side-Section ] Left Intake Manifold Side-Section and => [ Right Intake Manifold Side-Section ] Right Intake Manifold Side-Section.

- Disconnect electrical connections - 1 - at ignition coils - 2 -.





- Remove ignition coils from spark plugs using Ignition Coil Puller (W8 & W12 Eng.) (T10166).





- Using spark plug removal tool (3122 B), remove spark plugs.

- Check compression using compression tester (V.A.G 1763).

• Using tester => operating instructions.

- Have a second technician press accelerator pedal completely and at the same time operate starter long enough until pressure increase no longer appears on tester.





- Install spark plugs and ignition coils.

- Install intake manifold side parts => [ Left Intake Manifold Side-Section ] Left Intake Manifold Side-Section and => [ Right Intake Manifold Side-Section ] Right Intake Manifold Side-Section.

- As a final step, check DTC memory of Engine Control Module (ECM) and erase it, since malfunctions were stored by removing the fuse and disconnecting the electrical harness connectors.