Compression Check: Testing and Inspection

INSPECT COMPRESSION
(a) Warm up and stop the engine.
(1) Allow the engine to warm up to a normal operating temperature.
(b) Remove the V-bank cover.
(c) Remove the air cleaner hose assembly.
(d) Remove the air cleaner cap.





(e) Disconnect the 2 injector connectors and 8 ignition coil connectors.
(f) Remove the 8 bolts and 8 ignition coils.
(g) Remove the 8 spark plugs.





(h) Check the cylinder compression pressure.

NOTICE: Check each cylinder's compression pressure in the same way.

(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle.
(3) While cranking the engine, measure the compression pressure.
Standard compression pressure: 1300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure: 1000 kPa (10.2 kgf/cm2, 145 psi) or more
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi) or less

NOTICE:
^ Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
^ This measurement must be done as quickly as possible.

(4) If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again.

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.

(i) Install the 8 spark plugs.
(j) Install the 8 ignition coils with the 8 bolts.
(k) Connect the 2 injector connectors and 8 ignition coil connectors.
(l) Install the air cleaner cap.
(m) Install the air cleaner hose.
(n) Install the V-bank cover.