Compression, Checking

Special tools and workshop equipment required 

• Spark Plug Removal Tool: 3122B 
• Compression Tester Kit: VAG1763 
• : VAG1381/1 
• : VAG1381/5A 
• Compression Tester Kit - Adapter: VAG1763/13 

Test Sequence

• Engine oil temperature at least 30 °C (86 °F).
• Battery voltage at least 12.7 V.

Preliminary work may be required depending on the model. Refer to COMPRESSION, CHECKING .

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

-- Disconnect the connectors:

1. For the FSI Fuel Injectors in the Cylinder Head
2. For MPI Fuel Injectors in the Intake Manifold, If Installed

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

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

Courtesy of AUDI OF AMERICA, LLC

-- Install the : VAG1763/13  as shown in the respective spark plug hole and connect the : VAG1763  .

Courtesy of AUDI OF AMERICA, LLC

-- Check the compression using the : VAG1763  . Refer to the Operating Manual.

-- Press the accelerator pedal down all the way and operate the starter long enough until the tester no longer indicates an increase in pressure.

-- Repeat the procedure on each cylinder.

Compression Pressure	Pressure
New	11.0 to 14.0 bar (159.54 to 203.05 psi)
Wear limit	7.0 bar (101.52 psi)
Maximum difference between cylinders	3.0 bar (43.5 psi)

Assembling 

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

-- Install the ignition coils with power output stages. 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 using the Vehicle Diagnostic Tester.

There are additional procedures depending on the model. Refer to COMPRESSION, CHECKING .