G37x Sedan AWD V6-3.7L (VQ37VHR) (2010)
Compression Check: Testing and Inspection
COMPRESSION PRESSURE
Inspection
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to See: Tune-up and Engine Performance Checks/Fuel Pressure/Testing and Inspection.
3. Disconnect fuel pump fuse (1) from IPDM E/R (2) to avoid fuel injection during measurement.
4. Remove engine cover with power tool. Refer to See: Access Cover/Service and Repair/Exploded View.
5. Remove ignition coil and spark plug from each cylinder. Refer to See: Powertrain Management/Ignition System/Ignition Coil/Service and
Repair/Exploded View.
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install compression gauge with an adapter (commercial service tool) onto spark plug hole.
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Use the adapter whose picking up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it may be caught by
cylinder head during removal.
a : 20 mm (0.79 in)
8. With accelerator pedal fully depressed, turn ignition switch to "START" for cranking. When the gauge pointer stabilizes, read the compression
pressure and the engine rpm. Perform these steps to check each cylinder.
Compression pressure : Refer to EM-148, "General Specification". See: Specifications
CAUTION:
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Measure a six-cylinder under the same conditions since a measurement depends on measurement conditions (engine water temperature,
etc.).
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Always use a fully changed battery to obtain the specified engine speed.