why does my BMW 5 Series G30/G31 (2017-2024) emit white smoke from the exhaust

Solution

1. Preparation

• Tools Required: OBD-II scanner, coolant system pressure tester, compression tester, leak-down tester, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Address Coolant Leaks

• Step 1: Remove the engine cover (if applicable) using a socket set.
• Step 2: Use a coolant system pressure tester to pressurize the cooling system; inspect for leaks.
• Step 3: Replace any leaking hoses, gaskets, or seals identified during inspection.

3. Repair or Replace Head Gasket

• Step 1: Remove the intake manifold and exhaust manifold, taking care to label all connections.
• Step 2: Remove the cylinder head bolts in the correct sequence and lift the cylinder head off.
• Step 3: Inspect the head and engine block for cracks or warping using a straightedge.
• Step 4: Clean the mating surfaces thoroughly and replace the head gasket with a new OEM part.
• Step 5: Reassemble the cylinder head and manifolds using a torque wrench, adhering to BMW torque specifications.

4. Refill and Bleed Cooling System

• Step 1: Refill the cooling system with the manufacturer-recommended coolant.
• Step 2: Bleed the cooling system to remove any air pockets by running the engine with the radiator cap off until the thermostat opens.

5. Final Assembly and Testing

• Step 1: Reconnect the battery and ensure all electrical connections are secure.
• Step 2: Start the engine and allow it to reach operating temperature while monitoring for smoke and leaks.