my Genesis G70 has a rough idle when cold what's going on

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down completely before beginning work.

2. Check and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if necessary to access the spark plugs.
  2. Using a socket set, remove the spark plugs.
  3. Inspect the spark plugs for signs of wear or carbon buildup.
  4. If damaged, replace with OEM spark plugs, ensuring the gap is set to manufacturer specifications.
  5. Reinstall the spark plugs and torque them to the manufacturer's specified torque value.

3. Inspect and Replace Coolant Temperature Sensor (if faulty)

• Sub-steps:
  1. Locate the coolant temperature sensor on the engine.
  2. Disconnect the electrical connector from the sensor.
  3. Unscrew the sensor using a socket wrench and remove it from the engine.
  4. Install the new coolant temperature sensor and connect the electrical connector.
  5. Ensure all connections are secure and the sensor is properly seated.

4. Clean Throttle Body

• Sub-steps:
  1. Access the throttle body by removing the air intake duct.
  2. Using throttle body cleaner, spray the inside of the throttle body to remove carbon buildup.
  3. Use a clean cloth to wipe away residue and ensure the throttle plate can move freely.
  4. Reassemble all components and secure the air intake duct.