how to resolve engine misfire in Renault Clio V (2019-Present) with P0301 code

Learn how to diagnose and fix P0301 cylinder 1 misfire in Renault Clio V. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before proceeding.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, dielectric grease.
• Remove the spark plug wire or coil pack from cylinder 1.
• Use the spark plug socket to carefully remove the spark plug.
• Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, cracks).
• If necessary, replace with a new spark plug, ensuring the gap is set to manufacturer specifications (typically around 0.8mm for the Clio).
• Apply a small amount of dielectric grease to the spark plug boot before reinstallation.

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter (for testing).
• Disconnect the ignition coil wiring harness.
• Remove the ignition coil from cylinder 1 using the socket set.
• Test the ignition coil with a multimeter (check for resistance according to specifications).
• If faulty, replace the ignition coil with a new one and reinstall it securely.

4. Assess and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, appropriate socket set.
• Disconnect the fuel injector connector and remove it from the rail.
• Use a fuel injector cleaner to clean the injector or replace it if needed.
• Reconnect the fuel injector and ensure it seats properly.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and insert the compression tester.
• Crank the engine several times and record the compression reading.
• Compare the reading with manufacturer specifications; if low, further engine diagnostics may be required.