Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer instruction manual for specific instructions.
CAUTION:
Use a remote starter to crank engine during compression test, NOT the ignition switch. The fuel injectors on many fuel injected models are triggered during the cranking mode. This could cause a fire hazard, flooding, crankcase contamination, hydrostatic lock, or lubrication to be washed off of cylinder walls.
Check engine compression at normal operating temperature with all spark plugs removed. To prevent damage to catalytic converter, make tests quickly and only when necessary.
ENGINE COMPRESSION (1)
| Application | Specification | |||
|---|---|---|---|---|
| Compression Ratio | ||||
| 900 Non-Turbo | 10.1:1 | |||
| 900 Turbo | 9.0:1 | |||
| 9000 Non-Turbo | 10.1:1 | |||
| 9000 Turbo | 8.5:1 | |||
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