Compression Check: Testing and Inspection
INSPECT COMPRESSIONa) Remove the V-bank cover.
b) Remove the air cleaner assembly.
c) Remove the intake air surge tank.
d) Remove the 6 ignition coils.
e) Remove the 6 spark plugs.
f) Disconnect the 6 injector connectors.
g) Inspect the cylinder compression pressure.
1) Insert a compression gauge into the spark plug hole.
2) Fully open the throttle by hand.
3) While cranking the engine, measure the compression pressure.
HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more.
4) Repeat steps through 1) to 3) for each cylinder.
NOTICE: This measurement must be done as quickly as possible.
Compression pressure: 1.3 MPa (13.3 kgf/cm2, 189 psi) or more
Minimum pressure: 1.0 MPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 0.1 MPa (1.0 kgf/cm2, 15 psi) or less
5) If the cylinder compression in one or more cylinders is low, pour small amount of engine oil into the cylinder through the spark plug hole and repeat steps through 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, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
h) Connect the 6 injector connectors.
i) Install the 6 spark plugs.
j) Install the 6 ignition coils.
k) Install the intake air surge tank.
l) Install the air cleaner assembly.
m) Install the V-bank cover.