Bosch L3 Jetronic Fuel Injection System Components — Removal and Installation (Opel Omega A)

Note: If damaged, major components of the fuel injection system should be diagnosed by a GM dealer or other qualified service technician with the necessary testing equipment. If a defective component is found, it can be replaced following the instructions given in this Chapter.

Throttle switch

1. Disconnect the wire from the switch (photo).



2. Loosen the two mounting screws and disconnect the switch from the throttle shaft.

3. Installation is carried out in the reverse order, adjust the switch as described in Chapter 24.

Fuel injectors

4. Disconnect the negative battery cable.

5. Disconnect the wires from the injectors.

6. Remove the four bolts securing the fuel distribution line to the intake manifold (photo).



7. Use a screwdriver to remove the clamps securing the injectors to the distributor line.



8. Unscrew the union nut, disconnect the brake servo motor vacuum pipe from the intake manifold (photo).



9. Remove the fuel supply pipe hanger.

10. Loosen the injectors on the distributor line and remove them from the intake manifold.

11. Connect the ohmmeter to the injector terminals, the resistance should be 16.0 ±1.0 Ohm (photo).



12. Installation is carried out in the reverse order; if necessary, replace the injector O-rings.

Air flow sensor and control unit

13. Loosen the clamp, disconnect the air duct from the air flow sensor (photo). Disconnect the multi-pin plug of the electrical wiring.



14. Release the spring clips and lift the air flow sensor and cover off the air cleaner housing.



15. Wipe the sensor air valve and check that it moves freely.

16. The control unit is located inside the sensor cover, which can be removed by unscrewing four screws.

Material was taken from a resource [www.opelbook.ru]

17. Installation is carried out in reverse order.

Temperature sensor

18. The temperature sensor is located near the generator on the side of the block (photo).



19. Drain the cooling system (Section 2).

20. Disconnect the wires and unscrew the sensor.

21. To test the sensor, connect an ohmmeter to the two terminals and compare the resistance with the specifications.

22. Installation is carried out in the reverse order. Fill the cooling system as described in Section 2.

Auxiliary pneumatic valve

23. The auxiliary pneumatic valve is bolted to the side of the camshaft housing.

24. Disconnect the wires from the valve.

25. Loosen the hose clamps and disconnect the air hoses (photo).





26. Unscrew and remove the valve (photo).





27. The valve can be checked by looking through the connecting rod of the hose. When cold, the valve should be slightly open. When the valve is heated, (apply 12 volts to the terminals) the regulator disk should move and block the hole.

28. Installation is carried out in reverse order.

29. The control relay is located in the left rear corner of the engine compartment. Disabling the relay disables the fuel pump.

30. Lift the cover, remove the relay from the socket.

31. Installation is carried out in the reverse order of removal.

Fuel pressure regulator

32. The fuel pressure regulator is located between injectors No.3 and No.4 (photo).



33. Wrap a rag around the regulator to absorb any spilled fuel.

34. Disconnect the fuel and vacuum hoses and remove the regulator.



35. Installation is carried out in reverse order.

Throttle body housing

36. Disconnect the negative battery cable.

37. Loosen the clamps, disconnect the air intake duct and the auxiliary pneumatic valve hose (photo).





38. Install the clamp on the cooling hoses, then disconnect them from the casing (photo).





39. Disconnect the gas pedal cable, and the automatic transmission downshift (kickdown) cable and the mid-speed control cable.



40. Disconnect the wiring from the throttle switch.

41. Disconnect the throttle return spring.

42. Disconnect the crankcase ventilation hose.

43. Unscrew the nuts and remove the throttle body housing from the intake manifold. Remove the gasket.

44. Installation is carried out in the reverse order, install a new gasket and adjust the cables as necessary. Top up the coolant level.