how to fix exhaust smoke issue in my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to ensure safety.

2. Inspect and Replace PCV System

• Tools Required: Socket set, pliers, vacuum gauge
• Sub-steps:
  1. Locate the PCV valve and hoses.
  2. Remove the PCV valve from its housing by twisting and pulling it out.
  3. Inspect the valve for clogs or damage; replace if necessary.
  4. Check the hoses for cracks or blockages; replace any damaged hoses.
  5. Reinstall the new or cleaned PCV valve and hoses securely.

3. Check and Replace Engine Oil

• Tools Required: Oil filter wrench, drain pan, funnel, socket set
• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Place a drain pan under the oil pan and remove the oil drain plug to drain old oil.
  3. Replace the oil filter using an oil filter wrench.
  4. Reinstall the drain plug and torque it to the manufacturer’s specifications.
  5. Add the recommended engine oil through the oil fill cap.

4. Address Coolant Leaks

• Tools Required: Coolant pressure tester, funnel
• Sub-steps:
  1. Inspect the radiator, hoses, and engine for signs of coolant leaks; check for puddles or stains.
  2. If leaks are found, replace damaged hoses or the radiator as needed.
  3. Use a coolant pressure tester to ensure there are no leaks in the system.
  4. Refill the cooling system with the appropriate coolant mixture.

5. Compression Test

• Tools Required: Compression tester
• Sub-steps:
  1. Remove the spark plugs to allow easy access to the cylinders.
  2. Insert the compression tester into the first cylinder and crank the engine for several seconds.
  3. Record the compression reading; repeat for each cylinder.
  4. Compare the readings to manufacturer specifications; if any cylinder is below spec, further investigation is needed.