why does my BMW 3 Series F30/F31 (2012-2019) engine shake when idling

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety during electrical component handling.

2. Inspect Engine Mounts

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Lift the vehicle using a jack and secure it on jack stands.
  2. Visually inspect the engine mounts for cracks, tears, or signs of deterioration.
  3. Using a torque wrench, check the mounting bolts for proper torque and retighten if necessary.
  4. Replace any damaged engine mounts with OEM or equivalent parts.

3. Address Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner, basic hand tools.
• Sub-steps:
  1. Use a smoke machine to detect any vacuum leaks in the intake system.
  2. If a leak is found, replace the affected hoses or gaskets.
  3. If using carburetor cleaner, spray along the intake manifold and hoses while monitoring for RPM changes.

4. Inspect and Replace Ignition Components

• Tools Required: Socket set, spark plug socket, multimeter.
• Sub-steps:
  1. Remove the ignition coil packs and inspect for cracks or carbon tracking.
  2. Check spark plugs for wear; replace if needed with OEM specifications.
  3. Test the ignition coils with a multimeter to ensure proper resistance; replace any faulty coils.

5. Check Fuel Delivery System

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start) and check the pressure reading against the spec.
  3. If low, inspect the fuel pump and filter; replace if necessary.

6. Inspect Exhaust System

• Tools Required: Basic hand tools.
• Sub-steps:
  1. Visually inspect the exhaust system for any physical damage or rust.
  2. Check for blockages in the catalytic converter or muffler.
  3. Replace any damaged sections of the exhaust system.