Removing the rail and fuel injectors of the Renault Sandero engine

Remove the fuel rail and injectors for inspection and replacement.

Indirect signs of injector malfunction are:

• - unstable engine operation;
• - stop the engine at idle;
• - difficulty starting the engine;
• - increased idle speed of the crankshaft;
• - the engine does not develop full power, insufficient engine acceleration;
• - jerks and dips in the engine;
• - increased content of CO and CH in exhaust gases;
• - glow ignition due to leakage of nozzles.

To complete the task, you will need a set of screwdrivers, a Torx T30 key

We prepare the car for work and relieve fuel pressure, as described in the article "Checking the fuel pressure of a Renault Sandero car"

Remove the air filter (see the article - How to replace the Renault Sandero engine air filter element)

On the K4M engine, remove the fuel rail protection, for this

With a 13 head, unscrew the two nuts securing the protection

And carefully remove the fuel rail protection from the studs (shown by arrows)

Squeeze the latch and disconnect the wire block from the nozzle

We also disconnect the pads from the remaining injectors and take the wiring harness to the side

We measure the resistance of the injector winding with an ohmmeter by connecting the injector winding to the contacts

Resistance should be at 20˚ C - 12 ohms.

If the resistance of the injector winding is not correct, the injector must be replaced.

To replace the injector, unscrew the two bolts securing the fuel rail

We remove the ramp by removing the nozzles from the holes in the intake pipe and without disconnecting the pipeline from the ramp.

If the injector remained in the intake pipe when the rail was removed, the retainer of this injector must be replaced.

Pry off the nozzle lock with a screwdriver

Remove the nozzle retainer

Remove the nozzle from the fuel rail

Each time you remove the injectors, you need to replace the rubber o-rings

To replace the O-rings of the injectors, remove them from the atomizer

Remove the O-rings from the nozzle body. After installing new rings, lubricate them with engine oil.

Install all parts in reverse order

Removing and installing the fuel rail

You will need a Torx T30 wrench, side cutters, screwdrivers

Remove the fuel rail protection as described above

Disconnect the wire blocks from the injectors

We unscrew the two bolts of the fuel rail

Remove the ramp by removing the nozzles from the holes in the intake pipe

To disconnect the fuel line, we bite the plastic safety clamp

Squeeze the fixing ring and disconnect the pipeline from the fuel rail

If necessary, press the latches with a screwdriver

When disassembling the connection, it is necessary to replace the sealing rings of the pipeline

Remove the fuel rail assembly with injectors

Pry off the nozzle lock with a screwdriver

And remove the nozzle retainer

Remove the injector from the fuel rail

Install parts in reverse order.

Fix the fuel line with a new clamp.

We start the engine and check the tightness of the connections.