why does my Genesis G70 have rough idle when cold starting

Solution

1. Preparation

• Gather necessary tools and components.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if necessary to access spark plugs.
  2. Use a socket wrench to remove the spark plugs.
  3. Inspect the old plugs and clean any debris from the spark plug holes.
  4. Install new spark plugs, ensuring they are gapped to manufacturer specifications.
  5. Torque the spark plugs to the manufacturer's recommended value (typically around 13-15 ft-lbs).

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct using a screwdriver.
  3. Clean the sensor with MAF sensor cleaner or replace it if damaged.
  4. Reinstall the MAF sensor, ensuring a secure fit and reconnecting the electrical connector.

4. Inspect and Clean IAC Valve

• Sub-steps:
  1. Locate the IAC valve, typically mounted on the throttle body.
  2. Remove the valve using a socket wrench.
  3. Clean the valve with throttle body cleaner, removing any carbon buildup.
  4. Reinstall the IAC valve securely.

5. Check Coolant Temperature Sensor

• Sub-steps:
  1. Locate the coolant temperature sensor on the engine block.
  2. Disconnect the electrical connector and remove the sensor using a socket wrench.
  3. Test the sensor with a multimeter to ensure it is within specifications.
  4. Replace the sensor if it fails the test, and torque it to the specified value upon installation.