what does it mean if my Honda Civic 9th Generation (2012-2015) has a rough idle after startup

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Clean or Replace the Throttle Body

• Tools Required: Throttle body cleaner, screwdriver set, cleaning rags.
• Sub-steps:
  1. Remove the air intake hose connected to the throttle body.
  2. Use throttle body cleaner to clean the inside of the throttle body thoroughly.
  3. Reattach the air intake hose securely.

3. Replace Spark Plugs (if necessary)

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Remove the ignition coil cover (if applicable).
  2. Disconnect the ignition coils from the spark plugs.
  3. Remove old spark plugs using a spark plug socket.
  4. Install new spark plugs, tightening to the manufacturer’s specified torque (typically around 13-15 lb-ft).
  5. Reconnect ignition coils and covers.

4. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) to check for fuel pressure; it should be within the manufacturer's specifications.
  3. If pressure is low, check the fuel filter and fuel pump.