my Honda Accord Eleventh Generation (2023-present) has a rough idle when I start it cold

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Clean the Throttle Body

1. Remove the air intake duct to access the throttle body.
2. Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
3. Reinstall the air intake duct securely.

3. Replace Spark Plugs (if necessary)

1. Remove the ignition coils by unscrewing the retaining bolts.
2. Disconnect the electrical connectors from the ignition coils.
3. Use a spark plug socket to remove old spark plugs.
4. Gap the new spark plugs according to manufacturer specifications and install them.
5. Reconnect the ignition coils and secure them in place.

4. Test Coolant Temperature Sensor

1. Locate the coolant temperature sensor on the engine.
2. Disconnect the electrical connector and remove the sensor using a socket.
3. Install the new coolant temperature sensor and reconnect the wiring.

5. Verify Fuel Pressure

1. Connect a fuel pressure gauge to the fuel rail’s test port.
2. Turn the ignition to the ON position without starting the engine, and check the pressure.
3. If the pressure is out of specification, replace the fuel pump or filter as necessary.