Compression Pressure Inspection
caution

If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.

1.

Start the engine and allow to warm up to operating temperature (for about five minutes).

Stop the engine.

2.

Remove the ignition coils.

(Refer to Engine Electical System - "Ignition Coil")

3.

Remove the three spark plugs.

(Refer to Engine Electical System - "Spark Plug")

4.

Check the cylinder compression pressure.

(1)

Insert a compression gauge into the spark plug hole.

(2)

Fully open throttle.

(3)

While cranking the engine, measure the compression pressure.

caution

Always use a fully charged battery to obtain engine speed of 200 rpm or above.

(4)

Repeat steps (1) through (3) for each cylinder.

caution

This measurement must be taken as quickly as possible.

Compression pressure :

1,667 kPa (17.0 kg/cm², 241 psi)

Minimum pressure :

1,470 kPa (15.0 kg/cm², 213 psi)

Difference between each cylinder :

98 kPa (1.0 kg/cm², 14 psi) or less

(5)

If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps 1) through 3) for cylinders with low compression.

A.

If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.

B.

If pressure stays low, a valve may be sticking, seating is improper, or there may be leakage past the gasket.

5.

Reinstall the spark plugs.

(Refer to Engine Electical System - "Spark Plug")

6.

Install the ignition coil.

(Refer to Engine Electical System - "Ignition Coil")

7.

Connect the injector connectors and ignition coil connectors.

8.

Some DTCs may exist after the inspection test and may need to be manually cleared with GDS.

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