why does my Genesis G70 have a rough start when cold

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cold.
• Gather all necessary tools and parts.

2. Fuel System Inspection

• Sub-steps:
  1. Remove the fuel pump relay from the fuse box.
  2. Connect a fuel pressure gauge to the fuel rail service port.
  3. Reinstall the fuel pump relay and turn the ignition key to the "ON" position without starting the engine to check fuel pressure.
  4. If pressure is below specifications (typically 40-60 psi), consider replacing the fuel filter or fuel pump.

3. Ignition System Replacement

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the engine cover (if applicable) to access the ignition coils.
  3. Disconnect the electrical connectors from the ignition coils and remove the bolts securing them.
  4. Replace any faulty ignition coils and spark plugs with manufacturer-approved components.
  5. Reinstall the ignition coils and reconnect the electrical connectors.

4. Coolant Temperature Sensor Replacement

• Sub-steps:
  1. Locate the coolant temperature sensor on the engine.
  2. Disconnect the electrical connector and remove the sensor using a socket set.
  3. Install the new coolant temperature sensor, ensuring it is tightened to manufacturer specifications.
  4. Reconnect the electrical connector.

5. Final Assembly

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and allow it to reach operating temperature.
  3. Check for any leaks or unusual noises.