Compression Check: Testing and Inspection

1. Verify that the battery is fully charged. Recharge it if necessary, refer to Starting and Charging
2. Warm up the engine to the normal operating temperature.
3. Turn the engine off.
4. Remove all spark plugs.
5. Disconnect the ignition coil connector.
6. Install a compression gauge to the No.1 spark plug hole.
7. Fully depress the accelerator pedal and crank the engine.
8. Record the maximum gauge reading.
9. Check each cylinder as above and note maximum gauge reading.

Compression
^ Standard: 1,255 kPa (182 psi) @ 300 rpm.
^ Minimum: 883 kPa (128 psi) @ 300 rpm.
^ Maximum difference between cylinders: 196 kPa (28 psi).

10. If the compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder and recheck the compression.
a. If the compression increases, the piston, piston rings, or cylinder wall may be worn.
b. If the compression stays low, the valve may be stuck or improperly seated.
c. If the compression in adjacent cylinders stays low, the cylinder head gasket may be defective or the cylinder head distorted.
11. Connect the ignition coil connector.
12. Install the spark plugs then tighten to 15-22 Nm (11-16 ft. lbs.).