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) Fully open the throttle.
3) While cranking the engine, measure the compression pressure.
Compression pressure: 1.5 MPa (15.3 kgf/cm2, 218 psi)
Minimum pressure: 1.0 MPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 100 kPa (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.

4) 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.