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 (86 °F).

• Battery voltage at least 12.5 V.

- Remove all ignition coils.

- Disconnect the electrical connector - 1 - to the fuel injectors on the rear of the left cylinder head.






• Ignore items - 2, 3 - and - arrows -.

- Disconnect the electrical connector - 2 - to the fuel injectors on the rear of the right cylinder head.






• Ignore item - 1 - and - arrow -.

- Remove spark plugs with (3122 B).

- Check compression pressure with (V.A.G 1763) ; see operating instructions.

- Have a second technician press the accelerator pedal down all the way while operating the starter until the pressure increase is no longer displayed on the tester.

- Repeat procedure on each cylinder.






Assembling

Assemble in reverse order of disassembling. Note the following:

- Install spark plugs.

- Install ignition coils.

- If electrical connectors were disconnected and the engine was started, then malfunctions have been stored in the engine control module. Perform "generate readiness code" in Guided Functions .