why does my Volvo XC60 536 (2017-Present) have a rough idle when stopped

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Clean the Throttle Body

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Clean the throttle body using throttle body cleaner and a soft cloth.
  3. Ensure the throttle plate opens and closes smoothly.
• Tools Required: Throttle body cleaner, soft cloth, screwdriver set.

3. Replace Spark Plugs and Ignition Coils (if necessary)

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the spark plugs.
  2. Disconnect the ignition coil connectors and remove the coils.
  3. Remove the old spark plugs using a spark plug socket.
  4. Install new spark plugs, ensuring they are gapped correctly.
  5. Reinstall ignition coils and connectors.
• Tools Required: Spark plug socket, torque wrench, gap tool.
• Torque Values: Spark plugs should be torqued to manufacturer's specifications (usually around 15-20 lb-ft).

4. Check and Replace the Idle Air Control Valve (if necessary)

• Sub-steps:
  1. Locate the IAC valve (usually near the throttle body).
  2. Disconnect the electrical connector and remove the mounting screws.
  3. Install the new IAC valve and reconnect the electrical connector.
• Tools Required: Socket set.

5. Reconnect Battery and Clear Codes

• Reconnect the battery and use the OBD-II scanner to clear any stored trouble codes.