Porsche Cayenne E3 (2018-Present) rough idle when I start the car what’s wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Air Filter

• Sub-steps:
  • Open the hood and locate the air filter housing.
  • Remove the air filter housing cover by unscrewing any fasteners.
  • Take out the old air filter and inspect it for dirt and blockages.
  • Install a new air filter that meets OEM specifications.
  • Reattach the air filter housing cover securely.

3. Inspect Ignition System

• Sub-steps:
  • Remove the ignition coil cover to access the spark plugs and coils.
  • Disconnect the electrical connectors from the ignition coils.
  • Remove the ignition coils and inspect them for cracks or wear.
  • Remove the spark plugs using a spark plug socket and inspect for wear or fouling.
  • Replace faulty ignition coils and worn spark plugs with new OEM parts.
  • Reassemble the ignition components and reconnect electrical connectors.

4. Clean Throttle Body

• Sub-steps:
  • Locate the throttle body and remove the intake duct.
  • Use throttle body cleaner and a soft brush to clean the throttle plate and surrounding areas.
  • Ensure the throttle plate moves freely without obstruction.
  • Reattach the intake duct securely.

5. Check Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the ON position (do not start the engine) and check the fuel pressure reading.
  • If the pressure is below specifications, inspect the fuel pump and filter for issues.
  • Replace any faulty components as needed.