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)

• Ignition Coil Puller (T40039)

Procedure

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

• Battery voltage min. 12.5 V.

- Switch off ignition.

- Open the quick-release fasteners - 1 - and remove the front noise insulation.





- Disconnect electrical connector on engine speed sensor (G28) - arrow - at bottom of transmission.





- Remove front engine cover - 1 - and rear - 2 - - arrows -.





- Remove the left air duct hose - arrows -.





- Remove oil dipstick - 2 - from guide tube.





- Remove the bolts - 1 - and - 3 -.

- Disconnect electrical connectors to ignition coils and press wiring harness to side.

- Disconnect vacuum hose - 2 - from air guide hose.

- Loosen hose clamps - arrows - and lay aside air guide hose.

CAUTION!
Hose connectors - 1 - must not be opened.

All:

- Remove the bolts - 1 - and - 2 -.





- Disconnect electrical connectors to ignition coils and press wiring harness to side.

- Remove all ignition coils using (T40039).





- Using (3122 B), remove spark plugs.

- Check compression using (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.

- Repeat procedure on each cylinder.





Assembling

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

- Install spark plugs.

- Faults have been stored in the engine control modules because the connectors were disconnected: perform a generate readiness code under guided functions.

Tightening Specifications