Compression Pressure, Checking

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Special tools and workshop equipment required

Spark Plug Removal Tool 3122B
Compression Tester Kit VAG1763

Procedure

Fig 1: Identifying Ignition Coil Puller T40039 Removing Ignition Coils

Courtesy of AUDI OF AMERICA, LLC

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

-- Remove all ignition coils. Refer to IGNITION COILS, REMOVING AND INSTALLING .

-- Disconnect the connector -2- to the fuel injectors on the rear of the left cylinder head.

Fig 2: Disconnecting Connector To Fuel Injectors

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore items -1 and 3-.

-- Disconnect the connector -2- to the fuel injectors on the rear of the right cylinder head.

Fig 3: Disconnecting Connector From Oxygen Sensor

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore items -1 and 3-.

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

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

NOTE:

Information on using the tester. Refer to the Operating Instructions.

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

-- Repeat procedure on each cylinder.

Compression Pressure	Bar Pressure
New	11 to 14 bar (160 to 203 psi)
Wear limit	10 bar (145 psi)
Difference between cylinders	Maximum 3.0 (43 psi)

Assembling

Assemble in reverse order of disassembling. Note the following:

-- Install the spark plugs.

-- If there are any faults stored in the Diagnostic Trouble Code (DTC) memory that occurring during testing, erase them on the Vehicle Diagnostic Tester, Guided Functions , Check DTC Memory , then Generate Readiness Code .