Replacing elements of the central fuel injection (CFI) system

Fuel burner

Note: When replacing the fuel injector, it is not necessary to remove the throttle from the intake manifold. If there is a need to replace the main gasket or the intermediate gasket between the throttle body and the main body, or the idle speed control throttle actuator (ISC), you will have to remove the throttle body from the intake manifold. We do not recommend disassembling the fuel injection unit other than removing the items mentioned above.

1. Disconnect the negative battery cable.

2. Pull out the fuel injector electrical connector, unscrew the screw and remove the retainer (see picture).



3. Using a screwdriver, carefully lift and remove the injectors from the fuel recharging unit (see picture).






4. There are 2 sealing rings in the nozzle - the larger one is located at the top, the smaller one is at the bottom. The bottom ring may stick to the wall of the nozzle opening (see picture) Be sure to remove and discard it.



5. When replacing or installing an old nozzle, do not reuse the O-rings. Carefully remove the O-rings from the old injector (see picture). Install new rings as shown (see picture) and lubricate them with clean engine oil.





6. Installation of a nozzle is made upside-down.

Main gasket

7. Relieve pressure in the fuel system (see section 2).

8. Disconnect the negative battery cable.

9. Remove the connecting pipe from the air filter (see section 8).

10. Carefully mark the wires and terminals on the throttle body. then disconnect and set aside all wires (see picture).



11. Disconnect the PCV hose from the throttle body.

12. Disconnect the pressure and fuel return lines from the fuel injection unit (V section 3 a detailed description of the process of removing connectors of pipelines).

13. Disconnect the throttle cable and (in the presence of) throttle link cruise control cable (see section 9).

14. If the car has an automatic transmission. remove the C-clamp (see picture) and disconnect the downshift link from the throttle shaft. Push the rod down so it disengages from the shaft (see picture).





15. Unscrew nuts of fastening of the case of a throttle and disconnect those knot and a lining from an inlet collector.


16. If the gasket is leaking, install a new one, install the throttle body and tighten the fixing nuts to the required torque.

17. The rest of the assembly is carried out in the reverse order of disassembly.

Idle control engine (ISC)

Note: To prevent damage to the throttle bodies, when working on the throttle body, carefully hold it on a workbench.

18. Remove the throttle body (see paragraph 7 in paragraph 9).

19. Remove the three mounting screws of the ISC bracket (see pictures) and disconnect the ISC and bracket from the throttle body.





20. Remove the three fixing screws of the ISC bracket (see picture), separate the ISC from the support bracket.



21. Installation is carried out in the reverse order.

Fuel charger housing gasket

22. Remove the throttle body and idle speed control system (ISC) (paragraphs 7 to 15 and paragraph 19).

23. Unscrew the fuel charger and unscrew the four screws securing the throttle body to the main body of the fuel injection device, then separate both parts (see picture).



24. Remove the old gasket. If you have to use a scraper, do not damage the work surface.

25. Lay the main body on the workbench, upside down, put in place a new gasket, connect the throttle body, start the four screws and tighten them.

26. Install the idle speed control system and throttle assembly.