Compression Check: Testing and Inspection

INSPECT COMPRESSION
a. Warm up and stop engine.
b. Disconnect the injector connectors.
c. Remove ignition coil.
d. Remove spark plugs.
e. Inspect cylinder compression pressure.
1 Insert a compression gauge into the spark plug hole.
2 Fully open the throttle.
3 While cranking the engine, measure the compression pressure.
Compression pressure: 1.360 MPa (13.9 kgf/cm2, 198 psi)
Minimum pressure: 0.98 MPa (10 kgf/cm2, 142 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 14 psi)

NOTICE:
- Always use a fully charged battery to obtain engine speed of 250 rpm or more.
- Check other cylinder's compression pressure in the same way.
- This measurement must be done in as short a time as possible.

4 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, it is likely that the piston rings and/or cylinder bore are worn or damaged.
- If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past the gasket.