Compression, Checking

Special Tools And Workshop Equipment Required

Spark Plug Removal Tool 3122 B
Puller T40039
Torque Wrench (5-50 Nm) V.A.G 1331
Compression Tester V.A.G 1763
Adapter V.A.G 1763/6

Test Conditions:

Engine oil temperature must be at least 30 °C (86 °F).
Battery voltage at least 12.7 volts.

Test Sequence:

NOTE:

Follow all safety precautions. Refer to SAFETY PRECAUTIONS .

-- Remove the ignition coils with the power output stages. Refer to IGNITION COIL WITH POWER OUTPUT STAGE .

-- Remove the spark plugs using the spark plug removal tool 3122 B.

-- Check the compression pressure using the compression tester V.A.G 1763 and the adapter V.A.G 1763/6.

NOTE:

Using the tester, refer to the operating instructions.

-- Activate the starter until no further pressure increases are indicated by the tester.

Compression Pressure:

New: 11.0 to 14.0 bar pressure
Wear limit: 7.0 bar pressure
Permissible difference between all cylinders: Max. 3 bar

-- Install the spark plugs. Refer to IGNITION SYSTEM COMPONENT OVERVIEW .

-- Install the ignition coils with power output stages. Refer to IGNITION COIL WITH POWER OUTPUT STAGE .

NOTE:

By disconnecting the connectors, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the fault memory and erase, if necessary.

-- Check the Engine Control Module (ECM) DTC memory and erase any entries. Refer to "Guided Function" in the vehicle diagnostic tester.

NOTE:

If the DTC memory was erased, the readiness code must be generated again. Refer to "Guided Fault Finding" in the vehicle diagnostic tester.