Compression Check: Testing and Inspection

COMPRESSION
INSPECT COMPRESSION
(a) 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 (Procedure "A").
(2) Fully open the throttle forcibly by hand.
(3) While cranking the engine, measure the compression pressure (Procedure "B").

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

(4) Repeat procedures "A" to "B" 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 procedures "A" to "B" 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.