Compression Pressure Inspection
WARNING: This page is about a different variant/trim than selected.
NOTE:
- If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
- Warm up the engine to the normal operating temperature [80 to - 95°C (176 to - 203°F)].
- Disconnect the injector extension connector (A).
- Remove the LH/RH ignition coils.
(Refer to Engine Electrical System - "IGNITION COIL ")
- Remove the LH/RH spark plugs.
(Refer to Engine Electrical System - "SPARK PLUG ")
- Check the cylinder compression pressure.
- Insert a compression gauge into the spark plug hole (A).NOTE:
- Always use a fully charged battery to obtain engine speed of 250 rpm or more.
- Crank the engine over 7 times to measure compression pressure.
- Repeat steps 1 to 2 for each cylinder.NOTE:
- This measurement should be taken as promptly as possible.
Compression pressure:
1, 029 kPa (10.5 kgf/cm2 , 149 psi) (250 - 400 rpm)
Minimum pressure: 882 kPa (9.0 kgf/cm2 , 128 psi)
Difference between each cylinder: 98 kPa (1.0 kg/cm2 , 14 psi) or less
- If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps 1 to 3 for cylinders with low compression.
- If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
- If pressure stays low, there may be a sticking valve, an improper seating or leakage past the gasket.
- If the compression pressure is measured low from 2 adjacent cylinders, the cylinder head gasket damage may be suspected.
- Insert a compression gauge into the spark plug hole (A).
- Reinstall the LH/RH spark plugs.
(Refer to Engine Electrical System - "SPARK PLUG ")
- Install the LH/RH ignition coils.
(Refer to Engine Electrical System - "IGNITION COIL ")
- Install the injector extension connector (A).