Compression Check: Testing and Inspection

ON-VEHICLE INSPECTION

INSPECT COMPRESSION
a. Warm up and stop the engine.
b. Remove the No. 1 engine under cover.
c. Remove the 4 ignition coils.
d. Remove the 4 spark plugs.
e. Disconnect the 4 fuel injector connectors.





f. Set SST and a compression gauge.
SST 09992-00500
g. Insert the compression gauge into the spark plug hole.
h. While cranking the engine, measure the compression pressure.
Standard compression pressure: 1,300 kPa (113.8 kgf-cm2, 196 psi)
Minimum pressure: 1,000 kPa (110 kgf-cm2, 142 psi)
Standard difference between each cylinder: 100 kPa (1.0 kgf-cm2, 14 psi)

NOTICE:
^ Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
^ Check the other cylinders' compression pressures in the same way.
^ This measurement must be done as quickly as possible.

If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.

HINT:
^ 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 in the gasket.

i. Connect the 4 fuel injector connectors.
j. Install the 4 spark plugs.
Torque: 25 Nm (255 kgf-cm, 18 ft. lbs.)
k. Install the 4 ignition coils.
l. Install the No. 1 engine under cover.