why does my Renault Clio V (2019-Present) have a rough idle on cold starts

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Replace Engine Coolant Temperature Sensor

1. Locate the engine coolant temperature sensor (usually near the thermostat housing).
2. Disconnect the electrical connector from the sensor.
3. Remove the sensor using a socket or wrench.
4. Install the new sensor, ensuring it is properly seated.
5. Reconnect the electrical connector.

3. Clean Throttle Body

1. Remove the air intake duct to access the throttle body.
2. Use throttle body cleaner and a clean cloth to remove carbon buildup.
3. Operate the throttle manually to clean the interior surfaces.
4. Reinstall the air intake duct securely.

4. Replace Spark Plugs

1. Remove the ignition coil packs by unscrewing them from the engine.
2. Extract the old spark plugs using a spark plug socket.
3. Inspect the gap of the new spark plugs and adjust if necessary.
4. Install the new spark plugs and torque them to the manufacturer’s specifications (typically around 13-15 lb-ft).
5. Reinstall the ignition coil packs.

5. Check and Adjust Fuel Pressure

1. Connect a fuel pressure gauge to the fuel rail.
2. Turn the ignition on without starting the engine and check the fuel pressure.
3. If pressure is below specifications, locate and replace the fuel pump if necessary.
4. Disconnect the gauge and reconnect the fuel line securely.