Compression, Checking

WARNING: This page is about a different car, the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2009 Volkswagen GLI, 2008 Volkswagen Jetta, and 2008 Volkswagen GLI. However, it is still accessible from the selected car via links, so may be relevant.

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.