COMPRESSION INSPECTION [L3]

Warning

• Hot engines and oil can cause severe burns. Be careful not to burn yourself during removal/installation of each component.

1. Verify that the battery is fully charged.

• Recharge it if necessary. (See BATTERY INSPECTION [L3, AJ (3.0L Duratec)].)

2. Warm up the engine to the normal operating temperature.

3. Stop the engine and allow it to cool down for about 10 min.

4. Perform "Fuel Line Safety Procedures". Leave the fuel pump relay removed. (See BEFORE SERVICE PRECAUTION [L3].)

Warning

• Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure". (See BEFORE SERVICE PRECAUTION [L3].)

5. Remove the ignitoin coil (L.H.D. model).

6. Remove the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [L3].)

7. Remove the fuel pump relay. (See BEFORE SERVICE PRECAUTION [L3].)

8. Remove the ignition coil connector (R.H.D.model).

9. Connect a compression gauge into the spark plug hole.

10. Fully depress the accelerator pedal and crank the engine.

11. Note down the maximum gauge reading.

12. Inspect each cylinder as above.

• If the measured value is less than the limited value, or there is a cylinder whose compression value varies from that of other cylinders by 196.1 kPa {2,000 kgf/cm², 28.44 psi} or more, add a small amount of engine oil through the spark plug hole. Then measure the compression pressure and perform the respective operations for the following cases.

- If the compression increases, the piston, the piston rings, or cylinder wall may be worn and overhaul is required.

- If the compression stays low, a valve may be stuck or improperly seated and overhaul is required.

- If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the cylinder head distorted and overhaul is required.

Compression

kPa {kgf/cm², psi} [rpm]

Item	Engine type
	L3
Standard	1,530 {15.6, 221.8} [300]
Minimum	1,070 {10.9, 155.0} [300]
Maximum difference between cylinders	196.1 {2.000, 28.44}

13. Disconnect the compression gauge.

14. Connect the ignition coil connector (R.H.D.model).

15. Install the fuel pump relay. (See BEFORE SERVICE PRECAUTION [L3].)

16. Install the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [L3].)

17. Install the igntion coil (L.H.D.model)

18. Install the high-tension code.