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Home >> Audi >> 2000 >> A4 Sedan (8D2) L4-1.8L Turbo (ATW) >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Compression Check >> Testing and Inspection
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Compression Check: Testing and Inspection


Compression, checking

Special tools and equipment
- VAG1381 or VAG1763 compression tester
- 3122B spark plug removal tool

Test condition
- Minimum engine oil temperature: 30°C (86° F)

Test procedure
- Remove engine covers.
- Switch ignition off and remove harness connectors to ignition coils.





- Unbolt ignition coils (arrows).
- Remove all harness connectors to fuel injectors.
- Using 3122B spark plug removal tool, remove all spark plugs.
- Open throttle to Wide Open Throttle (WOT) position.
- Using VAG1381 or VAG1763 compression tester, test engine compression.

Note: Use VAG1381 or VAG1763 compression tester = user manual.

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





Compression pressure

Permissible difference between all cylinders: 3 bar (43 psi)
- Install spark plugs and ignition coils.
- Check DTC memory.

Note: Diagnostic Trouble Codes (DTCs) are stored when harness connectors are disconnected. After testing, check DTC memory and erase.





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