Compression Check: Testing and Inspection

Compression pressures, checking
Special tools and equipment





^ 3122 B Spark plug spanner
^ T10094 Puller
^ VAG 1331 Torque wrench (5...50 Nm)
^ VAG 1763 Compression tester

Test conditions
Engine oil temperature 20...30°C.
Battery voltage must be at least 11.5 V.
All electrical consumers, e.g. lights and rear window defroster must be switched off.

If the vehicle is equipped with an air conditioning system, this must be switched off.
On vehicles with an automatic transmission the selector lever must be in "P" or "N" position





Test sequence
^ Remove fuse No. 32 from fuse holder.

Note: Removing fuse No. 32 interrupts the voltage supply to the injectors.

^ Remove engine cover.
^ Loosen coolant expansion tank and place to one side.
^ Remove air cleaner upper part.
^ Remove intake manifold side parts.
^ Disconnect all 4-pin connectors from ignition coils.

Note: Before disconnecting the connector, mark the component to which it belongs.

^ Remove ignition coils with output stages using puller T10094.

CAUTION: Use of tool T10094 is required to avoid damaging these sensitive components.

^ Remove spark plugs with spark plug socket and extension 3122B.
^ Check compression pressure with compression tester VAG 1763.

Note: Using the compression tester, Refer to Operating instructions.

^ Operate starter until tester shows no further pressure Increase.

Compression pressure:
New: 10... 13 bar
Wear limit: 9 bar
Permissible difference between all cylinders: 3 bar
^ Check fault memory, if necessary, repair any malfunctions and then erase fault memory.