Compression Check: Testing and Inspection
INSPECT COMPRESSIONa. Remove the V-bank cover sub-assembly.
b. Remove the air cleaner hose assembly.
c. Disconnect the throttle control motor connector.
d. Remove the 8 ignition coils.
e. Remove the 8 spark plugs.
f. Disconnect the 8 injector connectors.
g. Inspect the cylinder compression pressure.
1 Insert a compression gauge into the spark plug hole.
2 Fully open the throttle forcibly by hand.
3 While cranking the engine, measure the compression pressure.
HINT: Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
4 Repeat steps (1) through (3) for each cylinder.
NOTICE: This measurement must be done as quickly as possible.
Compression pressure: 1,373 kPa (14.0 kgf/cm2, 199 psi) or more
Minimum pressure: 1,030 kPa (10.5 kgf/cm2, 149 psi)
Difference between each cylinder: 98 kPa (1.0 kgf/cm2, 14 psi) or less
5 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 and repeat steps through (1) to (3) for the cylinders with low compression.
^ If adding oil helps the compression, the piston rings and/or cylinder bore may be worn or damaged.
^ If pressure stays low, a valve may be sticking, seating is improper, or there may be leakage past the gasket.
h. Connect the 8 injector connectors.
i. Install the 8 spark plugs.
j. Install the 8 ignition coils.
k. Connect the throttle control motor connector.
l. Install the air cleaner hose assembly.
m. Install the V-bank cover sub-assembly.