Audi Workshop Service and Repair Manuals

Checking compression Special tools and workshop equipment required

t  Spark plug socket and extension -3122 B-

t  Compression tester -V.A.G 1763-

Procedure l  Engine oil temperature min. 30 °C. l  Battery voltage at least 12.5 V. –  Remove all ignition coils → Rep. gr.28.

–  Unplug electrical connector -2- for injectors at rear of cylinder head (left-side).   Note Disregard -items 1, 3-.

–  Unplug electrical connector -2- for injectors at rear of cylinder head (right-side).   Note Disregard -items 1, 3-. –  Remove spark plugs with spark plug socket and extension -3122 B-. –  Check compression pressure with compression tester -V.A.G 1763-.   Note Using the compression tester → Operating instructions. –  Have a 2nd 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	11.0 … 14.0
Wear limit	10.0
Difference between cylinders	3.0 (maximum)

Assembling Installation is carried out in the reverse order; note the following: –  Install spark plugs → Booklet811, → Booklet812 or → Booklet818. –  Entries are stored in the event memory of the engine control unit because electrical connectors have been unplugged and the engine started: Generate readiness code in Guided Functions → Vehicle diagnostic tester.