A4 Sedan L4-1.8L Turbo (AEB) (1997)
Compression Check: Testing and Inspection
Compression, checking
Special tools and equipment
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VAG1381 or VAG1763 compression tester
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3122B spark plug removal tool
Test condition
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Minimum engine oil temperature: 30°C (86° F)
Test procedure
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Remove engine covers.
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Switch ignition off and remove harness connectors to ignition coils.
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Unbolt ignition coils (arrows).
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Remove all harness connectors to fuel injectors.
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Using 3122B spark plug removal tool, remove all spark plugs.
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Open throttle to Wide Open Throttle (WOT) position.
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Using VAG1381 or VAG1763 compression tester, test engine compression.
Note: Use VAG1381 or VAG1763 compression tester = user manual.
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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)
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Install spark plugs and ignition coils.
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Check DTC memory.
Note: Diagnostic Trouble Codes (DTCs) are stored when harness connectors are disconnected. After testing, check DTC memory and erase.