Cruze

Engine Compression Test

Special Tools

For equivalent regional tools, refer to Special Tools .

1. Remove the engine sight shield. Refer to Engine Sight Shield Replacement .
2. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
3. Remove the 4 fuel injection fuel feed pipes . Refer to Fuel Injection Fuel Feed Pipe Removal .
4. Remove the 4 fuel injectors . Refer to Fuel Injector Removal .



5. Clean the injector sealing surfaces in the cylinder head using the EN-47632 cleaning tool (1) in following procedure:

5.1.	Use the brush side to loosen the dirt.

5.2.	Use the sponge side to remove the dirt.




6. Remove the front compartment fuse block cover (1).
7. Remove the fuel pump relay.

1. Install EN-50453 adaptor (1) to cylinder 1.
2. Install the fuel injector bracket (2).

Caution: Refer to Fastener Caution in the Preface section.

3. Install fuel injector bracket bolt (3) and tighten to 14 N·m+110° (124 lb in) +110°.




Note: Use a gauge with a measuring range of 10-40 bar (145-580 PSI).

4. Install the EN-50454 gauge (1) to the EN-50453 adaptor (3).
5. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
6. Check the compression of cylinder 1.

Note: A second technician is required.

7. Start engine for approximately 4 seconds.

Note: Engine speed at least 200 RPM.

8. Note the compression value.
9. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
10. Release pressure from the EN-50454 gauge (1) by pushing the release button (2).
11. Remove the EN-50454 gauge (1) from the EN-50453 adaptor .



12. Remove the fuel injector bracket bolt (3).
13. Remove the fuel injector bracket (2).
14. Remove the EN-46791 adaptor (1) from cylinder 1.
15. Repeat steps 1 to 13 to determine the compression of cylinders 2, 3, 4.

1. Install the 4 fuel injectors . Refer to Fuel Injector Installation .
2. Install the 4 fuel injection fuel feed pipes. Refer to Fuel Injection Fuel Feed Pipe Installation .



3. Install the fuel pump relay.
4. Install the front compartment fuse block cover (1).
5. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
6. Install the engine sight shield. Refer to Engine Sight Shield Replacement .