why does my Genesis G70 have a check engine light and rough acceleration

Solution

1. Preparation

• Gather tools: OBD-II scanner, fuel pressure gauge, socket set, torque wrench, and cleaning supplies.
• Disconnect the battery to ensure safety while working on electrical components.

2. Addressing Error Codes

• Using the OBD-II scanner, retrieve and note any error codes.
• Clear the codes and perform a test drive to see if they return.

3. Fuel System Inspection

• Fuel Pressure Measurement:
  • Connect the fuel pressure gauge to the fuel rail Schrader valve.
  • Turn the ignition to the "On" position without starting the engine and note the pressure reading. It should typically be between 40-60 psi (check manufacturer specifications).
  • If pressure is low, check the fuel pump and filter for issues.

4. Ignition System Maintenance

• Spark Plug Replacement:
  • Remove the ignition coils using a socket wrench.
  • Carefully extract the spark plugs using a spark plug socket.
  • Inspect for wear; replace with new plugs if necessary (typically, torque to specification of 12-15 lb-ft).

5. Throttle Body Cleaning

• Remove the air intake duct leading to the throttle body.
• Inspect the throttle body for carbon deposits.
• Use throttle body cleaner and a soft cloth to clean the interior surfaces, including the throttle plate.

6. Reassembly and Testing

• Reconnect all components removed during inspection and cleaning.
• Reconnect the battery.
• Start the engine and ensure smooth operation; monitor for any returning check engine codes.