Compression, Checking

Special tools and workshop equipment required

Test Sequence

NOTE:

Engine oil temperature min. 30 °C (86 °F)

Battery voltage at least 12.7 V

-- Remove the engine cover -arrows-.

Fig 1: Removing Engine Cover

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-- Release and disconnect the electrical connectors on all the ignition coils.

-- Remove the ignition coils with the T40039.

Fig 2: Identifying Ignition Coil Puller T40039 To Remove Ignition Coils

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-- Remove the spark plugs using a 3122 B.

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

NOTE:

Using tester, see Operating Instructions.

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

Compression Pressure:

New Bar Positive Pressure	Wear Limit Bar Positive Pressure	Difference Between Cylinders Bar Positive Pressure
11.0 to 14.0	7.0	Max. 3.0

-- Install spark plugs.

-- Install the ignition coils with output stages. Refer to Removal and Installation .

NOTE:

By separating the connections, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the DTC memory and erase, if necessary.

-- Check the Engine Control Module (ECM) DTC memory. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding"..