my Honda Accord Eleventh Generation (2023-present) runs rough at idle what's the issue

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Fault Codes

• If error codes are present, refer to the code definitions and repair any indicated faults.
• Clear the codes with the OBD-II scanner and restart the engine to see if the issue persists.

3. Inspect and Replace Spark Plugs

• Remove the ignition coils to access the spark plugs.
• Use a spark plug socket and ratchet to remove the spark plugs.
• Inspect for wear or fouling; replace with OEM spark plugs if necessary, ensuring proper torque (typically 13-15 ft-lbs).
• Reinstall ignition coils securely.

4. Clean the Idle Air Control Valve (IAC)

• Locate the IAC valve; disconnect the electrical connector and remove mounting screws.
• Clean the IAC with throttle body cleaner to remove carbon buildup.
• Reinstall the IAC valve and reconnect the electrical connector.

5. Check and Clean Air Intake

• Inspect the air filter for dirt or blockages and replace it if necessary.
• Clean the throttle body using a throttle body cleaner to ensure unrestricted airflow.
• Reassemble all intake components, ensuring secure connections.

6. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start) to check the pressure; it should be within the specified range (refer to service manual).
• If pressure is low, inspect the fuel pump and fuel filter for issues.