Audi Workshop Service and Repair Manuals

Checking compression Special tools and workshop equipment required

t  U/J extension and socket, 10 mm -3220-

t  Compression tester -V.A.G 1763-

t  Puller -T10094 A-

Procedure l  Engine oil temperature min. 30 °C l  Battery voltage at least 12.5 V. –  Switch off ignition. –  Detach cover from 9-position relay carrier / fuse holder on left side of dash panel. –  Remove fuse 18 in fuse holder B -SB18- for fuel system pressurisation pump -G6- on left side of dash panel. –  Detach bonnet → Chapter.

–  Apply puller -T10094 A- to all ignition coils -arrow-, pull out ignition coils and at the same time unplug electrical connectors at ignition coils for cylinders 1 ... 4. –  Remove spark plugs with spark plug socket and extension -3122 B-. –  Check compression pressure with compression tester -V.A.G 1763- (see → operating instructions for details of how to use tester). –  Have a second mechanic press down the accelerator pedal completely and at the same time operate the starter until the pressure on the tester display no longer increases. –  Repeat procedure on each cylinder.

Compression pressure	bar
When new	10.0 … 15.0
Wear limit	7.0
Maximum difference between cylinders	3.0

Installation is carried out in the reverse order; note the following: –  Install spark plugs → Booklet809. Faults are stored in engine control unit because electrical connectors have been unplugged. –  Connect vehicle diagnostic, testing and information system -VAS 5051B-. –  Start „Guided Functions“ mode. –  Generate readiness code in engine control unit.