Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122 B)

• Puller (T10095 A)

• Assembly tool (T10118)

• Torque wrench (VAG 1331)

• Compression tester (VAG 1763)

Test Conditions

• Engine oil temperature at least 30 °C

• The battery voltage must be at least 11.5 V.

• All electrical components such as, for example, lights and rear window defroster must be switched off.

• If vehicle is equipped with an Air Conditioning (A/C), it must be switched off.

• Selector lever must be in the "P" or "N" position.

Test Sequence

- Remove fuel pump fastener from fuse holder.

Voltage supply to fuel pump activation is interrupted when fuse is removed.

- Place assembly tool (T10118) on locking button - arrow - and carefully pull down harness connector.





- Slide on puller for ignition coil (T10095 A) from straight connector side in direction of arrow and pull out ignition coil with power output stage.





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

- Check compression pressure using the compression tester (VAG 1763).

• Using tester --> operating instructions.

- Let a second mechanic operate the starter just as long until a pressure increase is no longer indicated on the tester.

Compression Pressure





- Install the spark plugs using the spark plug removal tool (3122 B) and tighten to 20 Nm.

- Now install ignition coils with power output stage.

- To install, insert ignition coil with power output stage into corresponding spark plug shaft so that straight connector sides fit with each other - arrows -.





After test is completed:

- Connect vehicle diagnosis and service system (VAS 5052).

- Perform vehicle system test. Refer to " Guided Fault Finding".

- End vehicle system test, this will automatically erase Diagnostic Trouble Code (DTC) entries which occurred during the assembly.

- Generate readiness code in connection with road test.

Observe safety precautions that apply to road tests.

- Then perform vehicle system test anew and repair any occurring malfunctions if necessary.