Compression Check: Testing and Inspection

Compression pressure, checking
Special Tools and Equipment





^ 3122B spark plug removal tool





^ VAG 1381 or VAG 1763 compression tester

Test requirements:
^ Engine oil temperature at least 30°C
^ Battery voltage at least 12.7 V

Test sequence





- Remove rear engine cover (arrows).





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





- Remove coolant reservoir (arrows).
- 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).
- Remove air guide -1-.





- Detach Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-1- at air filter housing.
- Disconnect electrical harness connector-2- at Mass Air Flow (MAP)sensor.
- Remove air guide hose -3- together with Mass Air Flow (MAF)sensor.
- Remove air filter housing (arrows).





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





- Remove bolts -5- and -6- from right cylinder head.
- 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.
- Using VAG1381 or VAG1763 compression tester, test engine compression.

Note: Using VAG1381 or VAG1763 Compression Tester:

Refer 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.
^ Checking DTC and erasing if necessary.

Use VAS5051 tester to do so.





Tightening torque