How to replace an injector on Renault K4M and F4R engines

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  • OVERALL DIFFICULTY INDEX: 3/10
  • IF YOU HAVE NO TOOLS YOU SPEND $25 TO GET THEM FOR THIS JOB
  • IF YOU HAVE NO EXPERIENCE YOU SPEND 90 MINUTES TO CARRY OUT THIS JOB
  • RISK OF BURNS, SEE BELOW
BEFORE YOU START
  • Be careful not to touch any hot part of the engine. Work only on a cold engine or after stopping it by half an hour.
  • DO NOT PROCEED WITH THIS INTERVENTION UNLESS MAKING SURE THAT THE CAR KEY IS NOT IN THE CAR KEY SWITCH.
  • If your car has been left unused for a long period of time, you might experience trouble from degraded gasoline, known as stale gas.
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.

Symptoms of a failing petrol injector

The below symptoms are common to injectors and coils problems:
  1. Rough idle
  2. Increased engine noise
  3. Misfires from time to time, especially upon accelerating and re-accelerating
  4. Check engine light goes on and off from time to time
  5. Generation of a misfire code on a particular cylinder: P0301, P0302, P0303, P0304 and/or P0351, P0352, P0353, P0354. The last digit denotes the faulty cylinder number.
  6. Could generate random misfire code P0300 or misfire on unspecified Cylinder P0314.
  7. Loss of power
  8. Increased fuel consumption​
IMPORTANT: always start by diagnosing and fixing the ignition system, spark plugs and coils. Only after making sure of the ignition, you should consider an injector fault.

Reaching the injection rail on Dacia or Renault Duster and other vehicles equipped with any of the K4M and F4R engines

Take out the metal protector of the injection rail by unscrewing its two holding nuts and you will immediately have access to the injection rail as shown in the picture to the right.

Removing the injection rail from the Renault engine

Make sure that:
  • The car key is not in its switch
  • The driver's door is closed
Unscrew the two bolts that hold the injection rail to the cylinder head, and carefully take out the fuel line that connects to the rail.
Make sure not to drop the colored plastic clip that holds the fuel line connector.
Pull out the injection rail with little force on the right side so injectiors #1 and #2 get out of their seats, and check for any wires that connect to other devices than the injectors, like the sensor shown in the middle picture.
Disconnect the sensor's connector and continue pulling out the rail and gently tilting it so you can access the faulty injector.

Removing a petrol injector from the fuel rail.

Use a small flat screwdriver to take out the injector's fixing legs at both sides, then pull it out.

Refitting a new fuel injector on the injection rail

Make sure you acquired the exact same model of injector.
​Start pushing it into its seat.
Gently tilt the injector and push with force until the first leg holds to its support.
Tilt the injector while pushing hard until its other leg holds also to its support on the injection rail:

Refitting the injection rail on the Renault or Dacia Duster

Fit the nuts of the injection rail protector on their bolts along with a large and thick 8mm washer, so you can use a large slotted screwdriver as a lever for pushing the injection rail and injectors into their seats.
Proceed as follows:
  • Start on one side.
  • Make sure to push only at an injector level (opposite to where the injector connects to the rail), not between two injectors.
  • With your hand, hold the rail on the side where you already inserted an injector, while pushing with the lever on the other side.
  • Do not hesitate to spray the injector seals with little penetrating oil like WD-40 to make it easier of inserting the seals.
  • Re-assemble all connectors, fuel line, etc. by reversing previous steps
  • Start the engine and wait until it runs smooth (because the WD-40 you sprayed will impact the early combustion)
  • Check and make sure you have no fuel leaks
  • Clear the codes, drive your Renault and make sure all is fine.

See also...
And accessorize your Dacia Duster Phases 1 and 2 here: