Compression, Checking: Procedure

WARNING: This page is about a different car, the 2012 Audi S5, 2011 Audi S5, and 2010 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

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 Removal and Installation .

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

Fig 2: Disconnecting Connector To Fuel Injectors (Left Cylinder Head)

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore -1 and 3-

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

Fig 3: Disconnecting Connector To Fuel Injectors (Right Cylinder Head)

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore -1 and 3-.

-- Remove the spark plugs with 3122 B.

-- Check compression pressure using the V.A.G 1763.

NOTE:

Using tester see 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	11.0 to 14.0
Wear limit	10.0
Difference between cylinders	Max. 3.0