Compression, Checking

WARNING: This page is about a different car, the 2008 Volkswagen R32. 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 3122B
Puller for ignition coil T10095A
Assembly tool T10118
Torque wrench (5-50 Nm) VAG 1331
Compression tester VAG 1763

Test Conditions

Engine oil temperature at least 30 °C (86 °F).
The battery voltage must be at least 11.5 volts.

Test Sequence

-- Install the T10118 on the release button -arrow-, release the electrical connector retainers, and carefully remove the connectors from the ignition coils 1 through 6.

Fig 1: Identifying Assembly Tool -T10118- To Disconnect Connector From Ignition Coils 1 To 6

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- From the straight side of the electrical connector, push the T10095 A on in the -direction of the arrow-, and remove the ignition coil with power output stage.

Fig 2: Identifying Ignition Coil Removal

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove fuse SC 27 from the fuse holder.

By removing the SC 27 fuse, the voltage supply to the fuel pump relay is interrupted.

-- Remove the spark plugs using the 3122B.

-- Check the compression using the VAG 1763.

NOTE:

Using the tester → Operating instructions.

-- Operate the starter until the VAG 1763 shows no further pressure increase.

Compression Pressure

Engine code	new bar positive pressure	Wear limit bar positive pressure	Difference between cylinders bar positive pressure
CBRA	10.0 to 13.0	7.5	<ax. 3.0

-- Thereafter, reinstall the spark plugs and the ignition coils with power output stages. Refer to IGNITION COILS WITH POWER OUTPUT STAGES .

After the test is completed:

-- Perform a vehicle system test.

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

-- Generate a readiness code in connection with a road test.

Observe the safety precautions that apply to road tests.

-- Perform a test drive.

-- After that perform the vehicle system test again and repair any occurring malfunctions.