Compression Check: Testing and Inspection
INSPECT COMPRESSIONa. Warm up and stop engine.
b. Disconnect the injector connectors.
c. Remove ignition coils.
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 (110 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.