why does my Honda Accord 9th Generation (2013-2017) engine misfire at idle

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down if it has been running.

2. Replace Spark Plugs

• Remove the engine cover (if applicable).
• Use a socket set to remove spark plug wires or ignition coils.
• Remove old spark plugs using a spark plug socket.
• Inspect and replace with new spark plugs, ensuring the correct gap (refer to owner’s manual).
• Reinstall ignition coils and spark plug wires.

3. Inspect and Replace Ignition Coils (if necessary)

• Disconnect the electrical connector from each ignition coil.
• Unbolt the ignition coils using a socket set and replace with new coils.
• Reconnect the electrical connectors securely.

4. Clean or Replace Fuel Injectors

• Remove the fuel rail (ensure to relieve fuel pressure beforehand).
• Clean fuel injectors using a fuel injector cleaning kit or replace them if they are damaged.
• Reinstall the fuel rail and ensure all connections are tight.

5. Check and Repair Vacuum Leaks

• Inspect all hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses.
• Use a smoke machine to detect hard-to-find leaks if necessary.