Checking compression

Special tools and workshop equipment required

• Spark plug socket - 3122 B-
• Torque wrench - V.A.G 1331-
• Compression tester - V.A.G 1763-
• Puller - T10094 A-

Prerequisites for check

• The engine oil temperature must be at least 30 °C.

Procedure

• Remove engine cover panel.
• Remove ignition coils. Use puller - T10094 A- for this purpose.
• Unscrew spark plugs with spark plug socket and extension - 3122 B- ⇒ 1.2 Removing and installing ignition coils with output stage.
• Remove fuse for fuel pump control unit voltage supply from fuse holder beneath left dash panel ⇒ Current flow diagrams, Electrical fault finding and Fitting locations.

• Check compression using compression tester - V.A.G 1763-, adapter - V.A.G 1381/1- and adapter - V.A.G 1381/5A-.

• Operate starter until tester shows no further pressure increase.

• Insert spark plugs using spark plug socket - 3122 B- and tighten to 25 Nm.

Further assembly is basically a reverse of the dismantling sequence.

• Read event memory, rectify any faults and then clear event memory: ⇒ Vehicle diagnostic tester “Guided Fault Finding”.

The readiness code must be generated if the event memory has been cleared.