Compression Check: Testing and Inspection

Compression Check

1) Warm up engine to normal operating temperature.
2) Stop engine after warm-up.
3) For CVT model, place select lever in "P" and apply parking brake.

For M/T model, place gear shift lever in "Neutral" and apply parking brake.
4) Remove engine cover.
5) Remove all ignition coils and spark plugs. Spark Plug Removal and Installation
6) Disconnect all fuel injector connectors.
7) Connect special tools together and install then into spark plug hole.
Special Tool

(A): 09915-64512

(B): 09915-64530

(C): 09915-67010





8) Depress accelerator pedal all the way to fully open throttle.

NOTE:
For M/T model, disengage clutch to lighten starting load on engine, and depress accelerator pedal all the way to fully open throttle.

9) Crank engine with fully charged battery, and read the highest pressure on compression gauge.

NOTE:
- For measuring compression pressure, crank engine up to at least 200 rpm with fully charged battery.
- Check resting position of special tool if measured compression pressure is lower than the limit.
- If the measured compression pressure of particular cylinder is lower than the limit, add a bit of engine oil into the cylinder through the spark plug hole, and then repeat the compression check.
- If the compression pressure increases after adding engine oil, the following may be the cause:
- Pressure leakage due to worn piston rings or worn cylinder
- If the compression pressure does not increase, one of the following may be the causes:
- Incorrect valve timing
- Pressure leakage from the valve or valve seats
- Pressure leakage from the cylinder head gasket

Compression pressure
Standard: 1,400 kPa (14.3 kgf/cm2, 203 psi)
Limit: 1,100 kPa (11.2 kgf/cm2, 160 psi)
Max. difference between any two cylinders: 100 kPa (1.0 kgf/cm2, 14.5 psi)

10) Carry out Steps 7) through 9) on each cylinder.
11) Install spark plugs and ignition coil assemblies. Spark Plug Removal and Installation
12) Connect fuel injector connectors.
13) Install engine cover.