Compression, Checking

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required

Spark Plug Removal Tool 3122 B
Compression Tester V.A.G 1763

Procedure

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

-- Disconnect the injector valve connector -2-.

Fig 1: Identifying Crankcase Ventilation Hose, Removal

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore -1, 3, 4 and 5-.

-- Remove ignition coils. Refer to Removal and Installation .

-- Remove spark plugs with 3122 B.

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

-- 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	10.0 to 14.0
Wear limit	7.0
Maximum difference between cylinders	3.0

Assembling

Assemble in reverse order of disassembling. Note the following:

-- Install spark plugs. Refer to SPARK PLUGS, REMOVING AND INSTALLING

-- Install ignition coils. Refer to Removal and Installation .

Faults are saved in Engine Control Module (ECM) when electrical connectors are disconnected:

-- Connect vehicle diagnosis, testing and information systemVAS 5051B.

-- Start "Guided Functions" operating mode.

-- Generate readiness code in ECM.