Compression Check: Testing and Inspection

INSPECT COMPRESSION
a. Warm up and stop the engine.

NOTICE: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.

b. Remove the cool air intake duct seal.
c. Remove engine room side cover LH.
d. Remove engine room side cover RH.
e. Remove the V-bank cover.
f. Remove the air cleaner inlet No. 1.
g. Remove the air cleaner cap with the air cleaner hose.
h. Remove the intake air surge tank.
i. Disconnect the 6 injector connectors.
j. Remove the 6 ignition coils.
k. Remove the 6 spark plugs.





l. Disconnect the 2 injector driver connectors as shown in the illustration.





m. Insert a compression gauge into the spark plug hole.
n. While cranking the engine, measure the compression pressure.

HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more.

NOTICE: The measurement must be done as quickly as possible.

Standard compression pressure: 1.4 MPa (14 kgf/cm2, 199 psi) or more
Minimum pressure: 0.98 MPa (10.0 kgf/cm2, 142 psi)
o. Perform the inspection above for each cylinder.
Difference between each cylinder: 0.1 MPa (1.0 kgf/cm2, 15 psi) or less
p. If the cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole. Then perform the first 3 steps under inspect the cylinder compression pressure for the cylinders with low compression.

HINT:
^ If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.





q. Connect the 2 injector driver connectors as shown in the illustration.
r. Install the 6 spark plugs.
Torque: 25 Nm (254 kgf-cm, 18 ft. lbs.)
s. Install the 6 ignition coils.
Torque: 10 Nm (102 kgf-cm, 7 ft. lbs.)
t. Connect the 6 injector connectors.
u. Install the intake air surge tank.
v. Install the air cleaner cap with the air cleaner hose.
w. Install the air cleaner inlet No. 1.
Torque: 5.0 Nm (51 kgf-cm, 44 inch lbs.)
x. Install the V-bank cover.
y. Remove the engine room side cover LH.
z. Remove the engine room side cover RH.
aa. Install the cool air intake duct seal.