my Porsche Cayenne E3 (2018-Present) has a rough idle when I start it in the morning, what’s wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plugs

• Remove the engine cover (if applicable) using a socket set.
• Disconnect ignition coil connectors and remove coils from the spark plugs.
• Use a spark plug socket to remove old spark plugs.
• Inspect spark plugs for wear or fouling; replace with OEM specifications if needed.
• Reinstall new spark plugs and ignition coils, ensuring proper torque as per manufacturer specifications.

3. Check and Replace Fuel Filter (if necessary)

• Locate the fuel filter; refer to the service manual for specific location.
• Relieve fuel system pressure by removing the fuel pump relay and running the engine until it stalls.
• Disconnect fuel lines from the filter using appropriate tools, ensuring to catch any spilled fuel.
• Install the new fuel filter, ensuring the flow direction is correct, and reconnect fuel lines securely.

4. Inspect and Clean Mass Air Flow Sensor (MAF)

• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake using a Torx bit.
• Clean the MAF sensor with MAF cleaner spray; do not touch the sensor elements.
• Reinstall the cleaned MAF sensor and reconnect the electrical connector.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Replace any damaged hoses with OEM parts.
• After repairs, clear any error codes using the OBD-II scanner.