my BMW 3 Series E90/E91 (2005-2012) is jerking when I shift gears, what's wrong?

Solution

1. Preparation

• Gather necessary tools and components.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.
• Disconnect the battery for safety.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission fluid dipstick or fill plug.
  2. Remove the dipstick or fill plug and check fluid level using a clean cloth.
  3. If low, add the recommended transmission fluid until proper level is reached (refer to owner’s manual for specific fluid type).
  4. If fluid is burnt or dirty, drain the transmission fluid completely using a drain pan.
  5. Replace with fresh transmission fluid as specified in the owner’s manual.

3. Inspect and Replace Clutch (if applicable)

• Sub-steps:
  1. Remove the transmission from the vehicle (refer to service manual for detailed instructions).
  2. Inspect the clutch disc and pressure plate for wear.
  3. Replace the clutch kit if any damage or excessive wear is observed.
  4. Reinstall the transmission following the correct torque specifications for the bolts.

4. Check Engine Mounts

• Sub-steps:
  1. Visually inspect engine mounts for cracks or excessive wear.
  2. If damage is found, remove the old engine mounts using the appropriate socket set.
  3. Install new engine mounts, ensuring they are torqued to manufacturer specifications.