Remove the fuel rail and injectors for flushing or replacement
We prepare the car and relieve the fuel pressure in the fuel supply system, as indicated in the previous article
Disconnect the negative battery terminal
Remove the decorative engine cover
Remove the air filter cover assembly with the air supply sleeve
Remove the plastic safety cover of the fuel line coupling
Insert the tool into the gap between the fuel line coupling and the pipe of the fuel pressure pulsation compensator
After that, disconnect the fuel line from the fuel rail
To disconnect the fuel line, the tool must compress the four spring clips inside the coupling
Disconnect the hose of the large branch of the crankcase ventilation system from the non-return valve by squeezing the bent ears of the clamp with your fingers
Remove the two fuel injector harness holders from the fuel rail mounting bolts
Disconnect the wire blocks from the fuel injectors and take the harness away from the fuel rail
We unscrew the two bolts securing the fuel rail to the cylinder head
And remove the fuel rail
Remove the spacers installed under the ramp
If, when removing the ramp, the nozzles remained in the intake pipe, take them out
Install the fuel rail and all removed parts in reverse order, replacing the O-rings
Removing, checking and installing injectors
Possible signs of injector failure:
- - unstable engine operation;
- - difficulty starting the engine;
- - stop the engine at idle;
- - the engine does not develop full power;
- - jerks and dips in the engine;
- - increased fuel consumption;
- - increased content of CO and CH in exhaust gases;
- - glow ignition due to leakage of injectors
Remove the fuel rail as described above
Remove the injectors from the holes of the fuel rail
Check the resistance of the injector winding by connecting the probes of the autotester to the winding terminals
The resistance of a good injector should be 11.6-12.4 ohms.
If the resistance is not correct, you need to replace the nozzle
Checking the nozzle according to the shape of the spray of the fuel jet and for tightness should be carried out at specialized service stations
Before installing the injectors, we replace the upper and lower sealing rings
If we install the old nozzles, then you need to wash their sprayers with a solvent or carburetor cleaner
Install the nozzles in reverse order.
Before installing the injectors, lubricate the O-rings with engine oil
Check the tightness of the connections and install all the parts in reverse order
