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-

t	Puller -T40039-

Test conditions l  Engine oil temperature at least 30 °C l  Battery voltage at least 12.5 V

Test sequence –  Pull off engine cover panel -arrows-.

–  Remove bolts -1-. –  Unplug electrical connectors on ignition coils -2-. –  Remove ignition coils.   Note

Use puller -T40039- to remove ignition coils. –  Remove spark plugs with spark plug socket -3122 B-.

–  Unplug 8-pin connector -3- going to injectors.   Note Ignore items marked -1-, -2- and -4 ... 7-. –  Test the compression pressure with the compression tester -V.A.G 1763-.   Note Using the compression tester → operating instructions. –  Have a 2nd mechanic press down the accelerator pedal completely and simultaneously operate the starter until the pressure no longer increases on the tester display.

Compression pressure	bar
When new	10.0 … 13.0
Wear limit	7.0
Difference between cylinders	3.0 (maximum)

–  Install spark plugs and ignition coils → Rep. Gr.28. –  Interrogate and erase the fault memory for engine control unit, as faults are stored when the electrical connectors are unplugged → Vehicle diagnosis, testing and information system VAS 5051.