Compression, Checking

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2008 Volkswagen Jetta, 2007 Volkswagen Jetta, and 2006 Volkswagen Jetta. 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
Ignition Coil Puller T40039
Torque Wrench (5-50 Nm) V.A.G 1331
Compression Tester V.A.G 1763
Adapter V.A.G 1381/5A

Test Conditions:

The engine oil temperature must be at least 30 °C (86 °F).
The voltage supply is OK.

-- Remove the engine cover with air filter. Refer to ENGINE COVER WITH AIR FILTER .

-- Disconnect the connectors from all the fuel injectors.

-- Remove the ignition coils with power output stage. Refer to IGNITION COILS WITH POWER OUTPUT STAGES .

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

-- Check the compression using the compression tester V.A.G 1763 and the adapter V.A.G 1381/5A.

NOTE:

Using the tester, refer to the operating instructions.

-- Have a second technician operate the starter.

-- Operate starter until the tester shows no further pressure increase.

Compression Pressure:

New Bar Positive Pressure	Wear Limit Bar Positive Pressure	Difference Between Cylinders Bar Positive Pressure
9.0•••13.0	8.0	Max. 3.0

-- To conclude work, erase the Diagnostic Trouble Code (DTC) memory of the Engine Control Module (ECM) since malfunctions were stored by disconnecting the connectors. Refer to ENGINE CONTROL MODULE DTC MEMORY, CHECKING AND ERASING .