Compression Check: Testing and Inspection

Compression pressure, checking

Special tools and equipment

3122B Spark plug removal tool:

VAG1381 or VAG1763 Compression tester:

Requirements
^ Minimum engine oil temperature: 30°C
^ Battery voltage at least 12.7 V

Work sequence





- Remove rear engine cover (arrows).





- Remove cover -1- in engine compartment (left side).





- Remove coolant reservoir (arrow)
- Disconnect electrical wiring to Engine Coolant Level (ECL) warning switch -F66- at bottom of expansion tank.
- Tie coolant expansion tank with connected coolant hoses -1 to 3- to side.





- Remove cover -1- in engine compartment (right side).





- Remove bolts (arrows).
- Detach Evaporative Emission (EVAP) canister purge regulator valve -N80- -1- at air guide.
- Remove air guide -2-.





- Remove air filter housing (arrows).
- Disconnect electrical harness connector -1- at Mass Air Flow (MAF) sensor.
- Remove air guide hose -2- together with Mass Air Flow (MAF) sensor.





- Remove bolts -4- and -5- at left cylinder head cover.
- Disconnect electrical harness connectors -1- to -3- and -6-.
- Remove ignition coils (arrows).





- Remove bolts -5- and -6- at right cylinder head cover.
- Disconnect electrical harness connectors -1- to -4-.
- Remove ignition coils (arrows).
- Using 3122B spark plug removal tool, remove spark plugs.
- Remove all harness connectors to injectors.
- Open throttle fully.
- Test engine compression using VAG1381 or VAG1763 compression tester.

Note: Using VAG1381 or VAG1763 Compression Tester:

Go to Operating instructions
- Activate starter until no further pressure increases are indicated by VAG1381 or VAG1763 compression tester.

Compression values





- Install spark plugs and ignition coils.

The following work step must be performed after the engine compression test.
^ Check DTC and erasing if necessary.

Use VAS5051 tester.

Tightening torque