why does my Honda Civic 9th Generation (2012-2015) have a rough idle after filling up?

Solution

1. Preparation

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

2. Inspect and Clean Throttle Body

• Remove the air intake duct connected to the throttle body.
• Use a throttle body cleaner and a soft cloth to clean the inside of the throttle body, removing carbon deposits.
• Reattach the air intake duct securely.

3. Replace Fuel Filter (if necessary)

• Locate the fuel filter (usually found along the fuel line).
• Use a wrench to disconnect the fuel lines from the filter; have a cloth handy to catch any spilled fuel.
• Replace the old filter with a new one, ensuring the flow direction matches the markings on the filter.
• Reconnect the fuel lines and check for leaks.

4. Replace Spark Plugs (if necessary)

• Remove the ignition coils by unscrewing them and lifting them out.
• Unscrew the spark plugs using a spark plug socket.
• Inspect the old spark plugs for wear and replace them with new ones, ensuring proper gap settings as per manufacturer specifications.
• Reinstall the ignition coils and ensure they are seated properly.

5. Check and Clear Error Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear any existing error codes.
• Start the engine and observe for any new error codes or check engine light reactivating.