why does my Genesis G70 have a rough idle when cold starting?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect ignition coils by unplugging the electrical connectors.
  3. Remove the ignition coils using a socket wrench.
  4. Remove the spark plugs using a spark plug socket.
  5. Inspect the old spark plugs for wear or carbon buildup.
  6. Install new spark plugs according to manufacturer specifications (usually a torque of 13-15 lb-ft).
  7. Reinstall ignition coils and reconnect electrical connectors.

3. Clean the Throttle Body

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
  3. Ensure the throttle plate moves freely and does not stick.
  4. Reattach the air intake duct securely.

4. Test and Replace Coolant Temperature Sensor (if necessary)

• Sub-steps:
  1. Locate the coolant temperature sensor on the engine.
  2. Disconnect the electrical connector.
  3. Remove the sensor using a wrench.
  4. Install a new coolant temperature sensor and reconnect the electrical connector.
  5. Ensure the coolant is properly filled after sensor replacement.