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Servicing valve gear > < Removing and installing intake manifold (bottom section)

A3 Mk1

Checking compression
   
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 -T10112-

Test conditions
l  Engine oil temperature at least 30 °C.
l  Battery voltage at least 12.5 V
   
Test sequence
–  Switch off ignition.
–  Remove the fuses from sockets -29- and -32- for ignition coils and injectors.
  N24-0588
–  Take off engine cover panel -arrows-.
  A10-0885
–  Detach electrical connectors at outer injectors.
–  Detach spark plug connectors using puller -T10112-.
–  Remove spark plugs with spark plug socket -3122 B-.
–  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.
  A15-0908
Compression pressureNewWear limitDifference between cylinders
bar10.0 … 13.07.03.0 (maximum)

Installation is carried out in the reverse order; note the following:
–  Install spark plugs → Rep. Gr.28.
–  When finished, interrogate and erase the engine control unit fault memory, as faults are stored when fuses are removed and connectors are detached → Vehicle diagnosis, testing and information system VAS 5051.
   

Servicing valve gear > < Removing and installing intake manifold (bottom section)