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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge, torque wrench.
• Disconnect the battery to ensure safety while working on the electrical system.

2. Address Air Intake Issues

• Remove the air intake duct and inspect for blockages or damage.
• Clean or replace the air filter if it is dirty.
• Reinstall the air intake duct securely.

3. Replace Engine Coolant Temperature Sensor

• Locate the coolant temperature sensor on the engine.
• Disconnect the electrical connector and remove the sensor using a socket.
• Install the new sensor and reconnect the electrical connector.
• Torque the sensor to the manufacturer’s specification.

4. Test and Replace Fuel Pump if Necessary

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and monitor the pressure; it should match manufacturer specifications.
• If the pressure is low, replace the fuel pump following these steps:
  • Relieve fuel system pressure.
  • Disconnect the battery.
  • Remove the fuel tank and drain fuel.
  • Replace the fuel pump assembly.
  • Reinstall the tank and reconnect the battery.

5. Inspect and Replace Spark Plugs

• Remove the ignition coil cover and disconnect the coils.
• Remove the spark plugs using a socket and inspect for wear.
• Replace old spark plugs with new ones, ensuring the gap is set to specifications.
• Reinstall the ignition coils securely.

6. Clean or Replace Idle Air Control Valve

• Locate the IAC valve on the throttle body.
• Remove the valve and inspect for carbon buildup.
• Clean the valve with throttle body cleaner or replace it if heavily damaged.
• Reinstall the IAC valve and reconnect any electrical connectors.