how to fix my Volkswagen Passat B8 (2015-2022) if the engine shakes during idle?

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 negative terminal to ensure safety.

2. Inspect and Replace Engine Mounts

• Sub-steps:
  • Use a socket set to remove the bolts securing the engine mount brackets.
  • Lift the engine slightly using a jack and a block of wood to relieve tension on the mounts.
  • Remove the old engine mounts and install new ones, ensuring they are properly aligned.
  • Torque the mounting bolts to the manufacturer’s specifications (typically around 25-35 Nm, check specific values for your model).
• Tools Required: Socket set, engine hoist or jack, torque wrench.

3. Address Vacuum Leaks

• Sub-steps:
  • Inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
  • Use a smoke machine or carburetor cleaner to locate leaks by spraying around the intake area while the engine is running.
  • Seal any leaks found or replace gaskets as necessary.
• Tools Required: Smoke machine (optional), carburetor cleaner, hose clamp pliers.

4. Test and Replace Idle Air Control Valve

• Sub-steps:
  • Disconnect the IAC valve connector and remove it from the throttle body.
  • Test the valve with a multimeter to ensure it operates within specifications (check the service manual for exact values).
  • If faulty, install a new IAC valve and reconnect the electrical connector.
• Tools Required: Multimeter, socket set.

5. Inspect and Replace Spark Plugs

• Sub-steps:
  • Remove the ignition coil covers if applicable and unscrew the ignition coils.
  • Use a spark plug socket to remove the spark plugs. Inspect for wear or carbon buildup.
  • Install new spark plugs, ensuring to gap them according to manufacturer specifications (typically 0.7-0.8 mm for the Passat B8).
  • Reinstall ignition coils and covers.
• Tools Required: Spark plug socket, torque wrench, gap gauge.