M35x AWD V6-3.5L (VQ35HR) (2010)
Compression Check: Testing and Inspection
CYLINDER HEAD
On-Vehicle Service
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. See: 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. See: Engine, Cooling and Exhaust/Engine/Intake Manifold/Service and Repair/Intake Manifold
Collector/Removal and Installation.
5. Remove ignition coil and spark plug from each cylinder. See: Powertrain Management/Ignition System/Ignition Coil/Service and
Repair/Component See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Removal and Installation and See: Spark
Plug/Service and Repair/Component See: Spark Plug/Service and Repair/Removal and Installation.
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install compression tester (commercial service tool) with adapter 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 engine rpm. Perform these steps to check each cylinder.