Compression Check: Testing and Inspection

INSPECT COMPRESSION
a. Warm up and stop the engine.
b. Disconnect the injector connectors.
c. Remove the intake air surge tank.
d. Remove the 6 ignition coils.
e. Remove the 6 spark plugs.





f. Check the cylinder compression pressure.
1. Insert a compression gauge into the spark plug hole.
2. While cranking the engine, measure the compression pressure.
Compression pressure: 1.4 MPa (14 kgf/cm2, 199 psi)
Minimum pressure: 0.98 MPa (10 kgf/cm2, 142 psi)
Difference between each cylinder: 0.1 MPa (1.0 kgf/cm2, 15 psi)

NOTICE:
- Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
- Check the other cylinders' compression pressure in the same way.
- This measurement must be done as quickly as possible.

3. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.

HINT:
- If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
- If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.