The injectors are secured to the fuel rail by retainers.
Fuel constantly circulates around the injector body, which prevents the formation of petrol vapour bubbles and facilitates hot engine starting.
If an injector becomes clogged or fails, the following symptoms may occur:
- rough engine running;
- difficult engine starting;
- increased engine idle speed;
- engine stalling at idle;
- poor engine response;
- increased CO and CH content in the exhaust gases;
- pre-ignition.
To perform this work, you will need the following tools: 10 mm sockets, TORX-E12, screwdrivers.
Prepare the vehicle for the procedure.
Relieve the pressure in the fuel system.
Disconnect the negative battery terminal.
Fig. 1. Compress the clip of the fuel rail hose connector
Fig. 2. Disconnect the hose from the fuel rail
Fig. 3. Release the wiring harness connector clip of the fuel injectors
Fig. 4. Separate the connectors and disconnect connector «A» from the bracket
Remove the intake manifold – Renault Megane 2 Intake and exhaust system.
Fig. 5. Unscrew the two retaining bolts
Fig. 6. Remove the fuel rail
Removing and checking the injectors
Remove the fuel rail as described above.
Fig. 7. Release the injector wiring connector clip
Fig. 8. Disconnect the connector from the injector
Fig. 9. Prise out the injector retainer with a screwdriver
Fig. 10. Remove the retainer
Fig. 11. Remove the injector from the rail
Fig. 12. Remove the O-ring using a flat-blade screwdriver
When replacing an injector, replace the O-rings.
Fig. 13. Using an ohmmeter, check the resistance of the injector coil. The resistance should be 12 Ω
Check the spray pattern and flow rate of the injectors off the vehicle.
Reassemble all components in the reverse order.
Before installing the fuel rail on the engine, fit new O-rings to the injectors, lubricating them with engine oil beforehand.
Install the fuel rail on the engine.
Install the fuel rail retaining bolts.
Tighten the fuel rail retaining bolts to 9 N·m (0.9 kgf·m).
Connect the wiring harness connectors to the injectors.
Connect the fuel pipe to the fuel rail until the spring clip of the connector clicks.
Connect the negative battery terminal. Check the connections for leaks.
