Repair Procedures

Compression Pressure Test

1. 1
   Make sure that the engine oil has the correct viscosity and level and that the battery is fully charged. Run the engine until it reaches normal operating temperature. Turn the ignition switch to OFF.
2. 2
   Remove the engine cover.
3. 3
   Disconnect the injector extension connector (A) and the ignition coil connectors (B).

   

4. 4
   Remove the ignition coils (A).

   

5. 5
   Remove the spark plugs. Using a 16 mm spark plug socket, remove the 4 spark plugs.
6. 6
   Inspect the compression pressure in the cylinder.

   1. Insert the compression gauge into the spark plug hole.

      

   2. Set the throttle valve to the fully open position.
   3. While cranking the engine, measure the compression pressure.
   4. Repeat steps 1) through 3) for each cylinder.Compression Pressure Standard: 1225.83 kPa (12.5 kgf/cm², 177.79 psi) (200–250 rpm) Minimum: 1078.73 kPa (11.0 kgf/cm², 156.46 psi) Difference between each cylinder: 98 kPa (1.0 kgf/cm², 14 psi) or less
   5. If the compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole, then repeat steps 1) through 3) for the cylinders with low compression.
      • If adding oil improves compression, the piston rings and/or cylinder bore are likely worn or damaged.
      • If the pressure remains low, a valve may be stuck or improperly seated, or there may be a leak past the cylinder head gasket.
7. 7
   Install the spark plugs.

   Tightening torque: 7.8 ~ 9.8 N·m

8. 8
   Install the ignition coil.

   Tightening torque: 9.8 ~ 11.8 N·m

9. 9
   Connect the injector extension connector and the ignition coil connectors.
10. 10
    Install the engine cover.