what causes my Volkswagen Passat B8 (2015-2022) to have poor acceleration?

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Gather necessary tools and parts before starting the repair.

2. Clean or Replace Air Filter

• Sub-steps:
  • Locate the air filter housing and remove it by unscrewing or unclipping fasteners.
  • Take out the old air filter and inspect it for dirt and damage.
  • If dirty, clean the filter if reusable or replace it with a new one.
  • Reinstall the air filter and housing securely.

3. Inspect and Clean Throttle Body

• Sub-steps:
  • Remove the air intake duct connected to the throttle body.
  • Use throttle body cleaner and a soft cloth to clean the internal surfaces of the throttle body.
  • Ensure the throttle plate moves freely without sticking.
  • Reattach the air intake duct securely.

4. Replace Spark Plugs and Ignition Coils

• Sub-steps:
  • Remove the ignition coil cover if applicable.
  • Unscrew and pull out the ignition coils from the spark plugs.
  • Replace spark plugs with new ones, ensuring proper gap settings as per manufacturer specifications.
  • Reinstall the ignition coils and cover, ensuring a secure connection.

5. Fuel System Inspection

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition on (without starting the engine) to check fuel pressure; it should meet manufacturer specifications.
  • If pressure is low, inspect and replace the fuel filter or fuel pump as necessary.