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HOMESERVICE MANUALSSAAB19999-3 BASE, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGPRELIMINARY INSPECTION & ADJUSTMENTSMECHANICAL INSPECTIONCOMPRESSION
1999 Saab 9-3 Base, 2D Hatchback, Automatic

Mechanical Inspection: Compression

1999 Saab 9-3 Base, 2D Hatchback, AutomaticSECTION Compression

Check engine mechanical condition with compression gauge, vacuum gauge, or engine analyzer. See engine analyzer instruction manual for specific instructions.

CAUTION: Use a remote starter to crank engine during compression test. DO NOT use ignition switch. Fuel injectors on many fuel-injected models are triggered during cranking mode. This could cause a fire hazard, flooding, crankcase contamination, hydrostatic lock, or lubrication to be washed off cylinder walls.

Measure engine compression at normal operating temperature with all spark plugs removed. To prevent damage to catalytic converter, test quickly and only if necessary.

NOTE: Compression pressures are not specified by manufacturer. However, maximum variation between cylinders should not exceed 29 psi.
COMPRESSION RATIO

Application Specification
9-3 Series
2.0L 9.2:1
2.3L 9.35:1
9-5 Series
2.3L 9.35:1
3.0L 9.5:1
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.