Compression Pressure, Checking: Procedure: Notes

Fig 1: Engine Covers -1- & -2-

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• Engine oil temperature: minimum 30 °C
• Battery voltage minimum 12.5 V.

-- Remove the rear engine cover -top arrows-.

-- Remove the bolts -arrows-.

Fig 2: Identifying Coolant Hose And Coolant Reservoir

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-- Disconnect the connector from the Engine Coolant Level Warning Switch -F66- and move the coolant reservoir to the side with the coolant hoses -1, 2 and 3- still connected.

-- Remove the bolts -arrows- and disconnect the electrical connectors to the ignition coils on the left cylinder head.

Fig 3: Identifying Ignition Coil Connectors Wiring Harness And Screws

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-- Press the electrical wiring harness down slightly.

-- Disconnect the connector -3- to the fuel injectors on the rear of the left cylinder head.

Fig 4: Cylinder Bank 2 Oxygen Sensor Electrical Connectors

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-- Remove the air duct -arrows-.

Fig 5: Identifying Air Duct

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-- Free up the fuel line -1- and the wire -2- to the EVAP canister at the air guide pipe.

Fig 6: Free Up Air Guide Pipe And Fuel Hose

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-- Remove the vacuum hose -3- from the connection on the air guide pipe.

-- Remove the air guide pipe by loosening the hose clamp -4- and opening the clips -arrows-.

-- Disconnect the vacuum line -1-.

Fig 7: Disconnect Vacuum Line

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-- Remove the air filter housing and, if applicable, disconnect the electrical connector -2- on the rear side at the Intake Air Switch-Over Valve -N335-.

-- Remove the bolts -arrows- and disconnect the electrical connectors to the ignition coils on the right cylinder head.

Fig 8: Identifying Bolts On Right Cylinder Head

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-- Press the electrical wiring harness to the side.

-- Disconnect the connector -3- to the fuel injectors on the rear of the right cylinder head.

Fig 9: Identifying Bolts -Arrows- And Right Connector Bracket

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-- Remove all the ignition coils using the Puller - Ignition Coil:T40039  .

Fig 10: Identifying Ignition Coil Puller T40039 Removing Ignition Coils

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-- Remove the spark plugs with Spark Plug Removal Tool:3122B  .

-- Check the compression using the Compression Tester Kit:VAG1763  .

-- Have a second mechanic press the accelerator pedal down all the way while operating the starter until the pressure increase is no longer displayed on the tester.