Compression Check: Testing and Inspection

INSPECT COMPRESSION
(a) Warm up and stop the engine.
(b) Remove the V-bank cover.
(c) Remove the air cleaner assembly.
(d) Remove the intake air surge tank.
(e) Remove the 6 ignition coils.
(f) Remove the 6 spark plugs.
(g) Disconnect the 6 injector connectors.





(h) Inspect the cylinder compression pressure.
(1) Insert a compression gage into the spark plug hole (Procedure "A").
SST 09992-00500
(2) Fully open the throttle (Procedure "B").
(3) While cranking the engine, measure the compression pressure (Procedure "C").
Compression pressure: 1,300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure: 1,000 kPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi)

NOTICE:
^ Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.
^ Inspect the other cylinders in the same way.
^ Measure the compression in as short a time as possible.

(4) Repeat procedures "A" through "C" for each cylinder.
(5) If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat procedures "A" through "C" for cylinders with low compression.
^ If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
^ If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage from the gasket.
(i) Connect the 6 injector connectors.
(j) Install the 6 spark plugs.
(k) Install the 6 ignition coils.
(l) Install the intake air surge tank.
(m) Install the air cleaner assembly.
(n) Install the V-bank cover.