what causes my Volkswagen Tiguan to stall while driving

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Fuel System Inspection

• Tools Required: Fuel pressure gauge, basic hand tools.
• Sub-steps:
  1. Remove the fuel pump relay from the fuse box.
  2. Attach the fuel pressure gauge to the fuel rail service port.
  3. Reconnect the battery and turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
  4. Compare the reading with manufacturer specifications (typically 50-60 psi for Tiguan).
  5. If the pressure is low, check for clogs in the fuel filter or a faulty fuel pump.
  6. Replace the fuel filter or fuel pump if necessary.

3. Ignition System Repair

• Tools Required: Socket set, torque wrench, and spark plug socket.
• Sub-steps:
  1. Remove the engine cover to access the ignition coils and spark plugs.
  2. Inspect each spark plug for wear or carbon buildup; replace if necessary.
  3. Test ignition coils with a multimeter, ensuring they meet manufacturer specifications.
  4. Replace any faulty coils or plugs.
  5. Reassemble the engine cover and reconnect the battery.

4. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, soft cloth, and screwdriver.
• Sub-steps:
  1. Locate and remove the throttle body from the intake manifold.
  2. Spray throttle body cleaner onto the throttle plate and inside the body.
  3. Use a soft cloth to wipe clean any carbon deposits.
  4. Reinstall the throttle body and reconnect any electrical connectors.