Compression, Checking

Special tools and workshop equipment required 

• Spark Plug Removal Tool: 3122B 
• Compression Tester Kit: VAG1763 
• Compression Tester Kit - Adapter 5A: VAG1381/5A 
• Fuel Injection Gauge Kit - Adapter VAG1381/1: VAG1381/1 
• Vehicle Diagnostic Tester

Procedure 

• Engine oil temperature at least 30 °C (86 °F).
• Battery voltage minimum 12.5 V.

-- Remove the noise insulation. Refer to OVERVIEW - NOISE INSULATION .

-- Disconnect the connector -arrow- for the FSI fuel injectors in the cylinder head.

Fig 1: Locating Fuel Injector Connector

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-- Remove the ignition coils. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .

-- Remove the spark plugs with the : 3122B  .

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-- Disconnect the connector -arrow- for the MPI fuel injectors.

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-- Check the compression using the : VAG1763  , : VAG1381/1  and : VAG1381/5A  . (Information on using the tester. Refer to the Operating Instructions).

Fig 2: Identifying Compression Tester And Adapter

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• The help of a second technician is required for the following step.

-- Completely depress the gas pedal and operate starter long enough until the tester no longer indicates increase in pressure.

-- Repeat the procedure on each cylinder.

Assembling 

Assemble in the reverse order of removal. Note the following:

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

-- Install the ignition coils. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .

-- Delete the DTC memory entries in the engine control module that have occurred during the test. Refer to Vehicle Diagnostic Tester.

Tightening Specifications 

• Refer to OVERVIEW - NOISE INSULATION .