How to clean and insulate the COPs of a Dacia (Renault) Duster |
Fixing P0300, P0301, P0302, P0303, P0304, P0351, P0352, P0353 and P0354 OBDII fault codes on Renault.

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  • OVERALL DIFFICULTY INDEX: 2/10
  • IF YOU HAVE NO TOOLS YOU SPEND $25 TO GET THEM FOR THIS JOB
  • IF YOU HAVE NO EXPERIENCE YOU SPEND 30 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 at least one hour.
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 leaking ignition coils on the Dacia Duster

The below symptoms are common to leaking ignition coils, denoting the need to clean and insulate them:
  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
  9. Blinking battery indicator on dashboard, specially when accelerating.
  10. Other electrical problems like an A/C compressor clutch abnormally uncatching / re-catching several consecutive times
IMPORTANT: in case the above symptoms are persistent, then it is necessary to replace the faulty COP.
If you find water inside the spark plugs wells, click on the below button:

How to fix the ignition misfires on the Dacia / Renault Duster

Disconnect the ignition coil (coil-on-plug, COP) connector and unscrew the bolt that holds the COP.
Make sure not to drop the ignition coil fixing bolt.
Hold the COP firmly with your hand and pull it out.
Use a contact cleaner and a soft cloth to clean the rubber insulator (boot) of the COP.
Do not spray any product inside the COP, do so only on the rubber boots.
Apply a coat of insulating dielectric silicone spray to the ignition coil boot insulator.
Allow the ignition coils to dry for 15 minutes.
In the meantime, you can remove, clean and adjust your spark plugs.
Use the contact cleaner to clean the COP connectors prior to refitting the coils on the plugs.
Start your engine and enjoy a smooth ride.

See also...

Buy your Dacia and Renault Duster coils here, also for other Renault and Nissan models:
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