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COMPRESSION INSPECTION [L3 Turbo]

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  Warning

  • Hot engines can cause severe burns. Be careful not to burn yourself during removal/installation of each component.
  • Fuel vapor is hazardous. It can very easily ignite, causing death, serious injury, or damage. Always keep sparks and flames away from fuel.

1. Verify that the battery is completely charged. (See BATTERY INSPECTION [L8, LF, L3, L3 Turbo].)

2. Warm up the engine.

  Warning

  • Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can easily ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always perform the Fuel Line Safety Procedure. (See BEFORE SERVICE PRECAUTION [L3 Turbo].)

3. Remove the charge air cooler.

4. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [L8, LF, L3, L3 Turbo].)

5. Remove all the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [L8, LF, L3, L3 Turbo].)

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

7. Disconnect the injector driver module connectors. (See INJECTOR DRIVER MODULE REMOVAL/INSTALLATION [L3 Turbo].)

8. Measure the compression pressure using the following procedure.

  (1) Press the compression gauge into the spark plug hole.
  (2) Fully open the throttle valve.
  (3) Crank the engine and measure the compression pressure.

Compression
  Standard:1,280 kPa {13.1 kgf/cm2, 185.65 psi} [250rpm]
  Minimum:896 kPa {9.14 kgf/cm2, 129.96 psi} [250rpm]
  Maximum difference between cylinders:196.1 kPa {2.0 kgf/cm2, 28.5 psi}

  (4) Perform Steps (1) to (3) for all cylinders.
  (5) If it is less than the minimum specification, or there is a cylinder with a compression value that differs from that of other cylinders by 196.1 kPa or more {2.0 kgf/cm 2, 28.5 psi}, add a small quantity of engine oil through the spark plug hole and perform Steps (1) to (3).

  • If the pressure increases by adding the engine oil, the piston ring or the the cylinder surface is worn, or they are damaged. Perform overhaul servicing.
  • If the pressure does not increase, valve seizure, valve attachment failure, or pressure leakage from the cylinder head gasket might be occurring. Perform overhaul servicing.

9. connect the injector driver module connectors. (See INJECTOR DRIVER MODULE REMOVAL/INSTALLATION [L3 Turbo].)

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

11. Install the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [L8, LF, L3, L3 Turbo].)

12. Install the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [L8, LF, L3, L3 Turbo].)

13. Install the charge air cooler.