my Porsche Cayenne E3 (2018-Present) has a rough start when it’s warm what could be wrong

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover using a socket set.
  2. Disconnect the ignition coils from the spark plugs.
  3. Remove the spark plugs using a spark plug socket.
  4. Inspect the condition of the spark plugs for signs of wear or fouling; replace if necessary.
  5. Install new spark plugs to the manufacturer's torque specification (typically 15-20 Nm).
  6. Reconnect the ignition coils and reinstall the engine cover.

3. Fuel System Inspection

• Sub-steps:
  1. Reconnect the battery terminal.
  2. Remove the fuel pump relay to relieve fuel pressure.
  3. Connect the fuel pressure gauge to the fuel rail.
  4. Turn the ignition to the "ON" position (without starting) to check fuel pressure.
  5. Compare the reading to manufacturer specifications (usually around 50-60 psi); replace the fuel pump if pressure is low.
  6. Reinstall the relay after testing.

4. Throttle Body Cleaning

• Sub-steps:
  1. Disconnect the throttle body electrical connector.
  2. Remove the throttle body from the intake manifold by unscrewing the mounting bolts.
  3. Clean the throttle body using throttle body cleaner and a soft brush to remove carbon deposits.
  4. Reinstall the throttle body, ensuring to torque bolts to manufacturer specifications.
  5. Reconnect the electrical connector.

5. Engine Coolant Temperature Sensor Replacement

• Sub-steps:
  1. Locate the coolant temperature sensor (typically near the thermostat housing).
  2. Disconnect the electrical connector.
  3. Remove the sensor using a socket set.
  4. Install the new sensor and reconnect the electrical connector.
  5. Monitor coolant levels and top off if necessary.