Audi Workshop Service and Repair Manuals

Checking compression Special tools and workshop equipment required

t  Spark plug socket and extension -3122 B-

t  Puller -T40039-

t  Compression tester -V.A.G 1763- Test sequence   Note t  Engine oil temperature at least 30 °C t  Battery voltage at least 12.7 V

–  Remove engine cover panel -arrows-.

–  Unplug electrical connectors -arrows- at ignition coils.

–  Remove ignition coils using puller -T40039-. –  Remove spark plugs with spark plug spanner -3122 B-. –  Check compression pressure with compression tester -V.A.G 1763- and adapter -V.A.G 1763/6-.   Note Using the compression tester: → Operating instructions. –  Operate starter until pressure reading on tester no longer rises. Compression pressure:

New pressure in bar	Wear limit in bar	Permissible difference between cylinders in bar
11.0 ... 14.0	7.0	3.0 (maximum)

–  Install spark plugs → Booklet808. –  Install ignition coils with output stages → Rep. Gr.28.   Note Faults will have been stored in the memory because connectors have been unplugged. Interrogate and, if necessary, erase fault memory after completing the check. –  Read out fault memory of engine control unit → vehicle diagnostic, testing and information system VAS 5051 in "Guided Fault Finding" function.