why does my Porsche Cayenne E3 (2018-Present) have a rough idle when warm

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool if previously running.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coils from the spark plugs.
  3. Use a spark plug socket to remove the old spark plugs.
  4. Inspect the spark plugs for wear; replace if necessary (typically every 30,000 miles).
  5. Install new spark plugs and torque to manufacturer specifications (usually around 20 Nm).
  6. Reconnect the ignition coils.

3. Clean the Throttle Body

• Sub-steps:
  1. Remove the air intake duct to gain access to the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding area.
  3. Reinstall the air intake duct securely.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without cranking the engine and check the fuel pressure (should be around 50-60 psi).
  3. If pressure is low, inspect the fuel pump and filter for issues.
  4. Replace the fuel filter if it's clogged; follow the manufacturer's service manual for replacement instructions.

5. Inspect Engine Mounts

• Sub-steps:
  1. Visually inspect the engine mounts for cracks or signs of wear.
  2. If damaged, remove the old mounts (usually requires lifting the engine slightly).
  3. Install new engine mounts and torque to specification.