Compression Check: Testing and Inspection

Compression pressures, checking

Special tools, testers and auxiliary items required:

^ Spark plug removal tool 3122 B
^ Compression tester V.A.G 1763
^ Puller T40039

Test conditions
^ Engine oil temperature min. 30°C.
^ Battery voltage at least 12.5 V.

Test sequence
- Switch off ignition.





- Remove rear engine cover - arrows -.





- Remove front engine cover - arrows -.





- Remove coolant expansion tank - arrow -.
- Disconnect electrical connection from Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir and set aside coolant reservoir with coolant hoses - 1 - and - 2 - connected.





- Disconnect check valve - 1 - from connection at air duct hose.
- Remove air duct hose, thereby loosening hose clamp - 2 - and opening clips - arrows -.





- Remove the bolts - arrows -.
- Remove air duct - 1 - and - 2 -.





- Remove bolts - arrows - and disconnect electrical connections at ignition coils of left cylinder head.

Note: Ignore - Pos. 1 to 4 -.





- Remove bolts - arrows - and separate electrical connections at ignition coils of right cylinder head.

Note: Ignore - Pos. 1 to 5 -.





- Remove ignition coils using ignition coil puller T40039.





- On rear of left cylinder head, disconnect electrical harness connector - 3 - for fuel injectors.

Note: Ignore - Pos. 1 -, - Pos. 2 - and - arrow -.





- On rear of right cylinder head, disconnect electrical harness connector - 1 - for fuel injectors.

Note: Disregard - arrow -.

- Using spark plug removal tool 3122 B, remove spark plugs.
- Check compression using compression tester V.A.G 1763.

Note: 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.





Assembly is in reverse order of removal, note the following:
- Install spark plugs.
- Finally, check DTC memory and, if necessary, erase it. After DTC memory is erased, a readiness code must be generated for engine control module using operating mode Guided Fault-finding.

Torque specifications