Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark Plug Removal Tool (3122 B)

• Compression Tester (V.A.G 1763)

• Hose Clamps Up to 25 mm Dia. (3094)

• Pry Lever - Remove Outside Mirror (80-200)

• Puller for Ignition Coil (T10094)

Conditions

• Engine oil temperature min. 30 °C (86 °F).

• Battery voltage at least 12.5 V.

Sequence

- Turn off ignition.

- Remove fuse for Fuel Pump (FP) from socket "28".






- Remove rear engine cover - arrows -.






- Remove front engine cover - arrow 1 and arrows 2 -.






- Clamp off coolant hose - 2 - using (3094) and disconnect from coolant expansion tank.






- Remove coolant expansion tank - arrow -.

- Disconnect electrical connection from Engine Coolant Level (ECL) Warning Switch (F66) at bottom of the coolant reservoir and set aside coolant reservoir with coolant hoses - 1 and 3 - connected.

- If necessary, seal the connection using an appropriate plug.

- Remove bolt - arrow - at oil dipstick guide tube.






• Guide tube remains inserted in upper oil pan.

- Remove air filter cover - 2 -.






- Remove the air duct - 1 -.

• To pull out the clips - arrows -, use (80-200).

• If necessary, use silicon-free spray lubricant to facilitate removal.

- Unclip the fuel hose - 1 -.






- Separate electrical connector - 2 - from Mass Airflow (MAF) sensor.

- Disconnect MAF sensor from the intake air duct - 3 -.

- Remove upper section of the air filter housing with MAF sensor - arrows -.

- Remove bolts - 5 and 6 - on left cylinder head.






- Disconnect electrical harness connectors - 1 to 4 -.

- Remove ignition coils - arrows -.

• (T10094) can be used for removal.

- Remove bolts - 5 and 6 - on the right cylinder head.






- Disconnect electrical harness connectors - 1 to 4 -.

- Remove ignition coils - arrows -.

• (T10094) can be used for removal.

- Remove the spark plugs with the (3122 B).

- Open throttle valve completely.

- Check compression pressure using the (V.A.G 1763).

• Using tester see operating instructions.

- Operate starter until tester shows no further pressure increase.

Compression Pressure:






Assembly is performed in the reverse order of removal, noting the following:

- Install sparks plugs.

The following work step must be performed after the engine compression test.

- As a final step, check DTC memory of Engine Control Module (ECM) and erase it see vehicle diagnostic tester, since malfunctions were stored by removing the fuse.

Tightening Specifications






* Insert using locking compound.