why does my Volkswagen Tiguan First Generation (2007-2018) idle rough when in gear

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before starting any work.

2. Check and Replace Engine Mounts

• Sub-steps:
  • Remove any components obstructing access to the engine mounts.
  • Use a jack to support the engine slightly while removing the old mounts.
  • Remove the bolts securing the engine mounts to the frame and engine.
  • Install new engine mounts and torque the bolts to the manufacturer’s specifications (typically around 25-30 ft-lbs).
  • Reinstall any components that were removed for access.

3. Inspect and Clean the Air Intake System

• Sub-steps:
  • Remove the air intake duct and inspect for obstructions.
  • Clean the throttle body using throttle body cleaner and a soft cloth.
  • Reinstall the air intake components securely.

4. Fuel System Inspection

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail and start the engine.
  • Verify that the fuel pressure is within specifications (usually around 50-60 psi).
  • If pressure is low, inspect the fuel pump and filter for clogs.
  • Clean or replace fuel injectors as needed.

5. Inspect the Ignition System

• Sub-steps:
  • Remove spark plugs and inspect for wear or fouling.
  • Replace spark plugs with the correct specifications (typically NGK or Bosch).
  • Test ignition coils for proper operation with a multimeter.
  • Replace any faulty ignition coils.