Compression, checking: Procedure

Remove bolts -arrows- and remove engine cover panels A To C.

Fig 1: Removing Engine Cover Panels
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Remove air duct -arrows-.

Fig 2: Removing Air Duct
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Remove coolant reservoir -arrows- and move it clear to side.

NOTE: Leave coolant hoses connected.

Disconnect connector from coolant level monitor.
Remove cover panel from cylinder head cover (cylinder bank 4-6).

Fig 3: Removing Coolant Reservoir
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Release hose clamp -arrow-. See Fig 4.
Remove intake line -1-.
Disconnect hose -2-.
Detach water line -3-.

NOTE: Plug lower section of intake line.

Fig 4: Removing Hose Clamp And Intake Line

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Disconnect hose -1-.

WARNING: Fuel system is under pressure. Before opening the system, place a cloth around the connection. Then release pressure by carefully loosening the connection.

Fig 5: Disconnecting Hose

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Disconnect fuel supply line and fuel return line -1- and -2-, and move fuel lines clear.
Disconnect hose from EVAP valve -3-.

Fig 6: Disconnecting Fuel Supply/Return Lines And EVAP Valve
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Disconnect connector -1- from mass air flow (MAF) sensor.
Disconnect connectors -2- from ignition output stages, and move wiring clear.
Remove air cleaner.

Fig 7: Disconnecting Connectors From MAF Sensor And Ignition Coil Output Stages
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Remover cover panel from right-hand cylinder head cover -arrows-.

Fig 8: Removing Cover Panel From Right-Hand Cylinder Head Cover
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Disconnect hose -1-. See Fig 9.
Disconnect hose -2-.
Detach upper section of pressure line -3-.

Fig 9: Disconnecting Hose And Detaching Upper Section Of Pressure Line

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NOTE: Plug lower section of pressure line.

Disconnect crankcase breathers from cylinder head covers.
Disconnect plug connectors from ignition coils.
Remove ignition coils.
Remove spark plugs.
Disconnect connectors from all 6 injectors.
Remove fuse No. 28 (for fuel pump).
Disconnect 5-pin connector at power output stage of ignition coils.
Use compression tester VAG 1381 or VAG 1763.
Open throttle fully.
Operate starter until pressure reading on tester no longer rises.