Compression Check: Testing and Inspection

COMPRESSION
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.

(g) Install the 6 spark plugs.
Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf)
(h) Install the 6 ignition coils.
Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
(i) Install the intake air surge tank.