why does my BMW 3 Series F30/F31 (2012-2019) have poor acceleration?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to ensure safety.

2. Air Intake System Inspection

• Remove the air intake duct and inspect the air filter; replace if dirty.
• Clean the throttle body using throttle body cleaner and a soft brush.
• Reinstall the air intake duct securely.

3. Fuel System Check

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check that the fuel pressure is within specifications (typically 50-60 psi for BMW).
• If pressure is low, check the fuel pump and fuel filter; replace as necessary.

4. Ignition Component Replacement

• Remove the engine cover to access the ignition coils and spark plugs.
• Replace the spark plugs with OEM specifications, ensuring proper gap.
• If necessary, replace faulty ignition coils.

5. Exhaust System Examination

• Visually inspect the exhaust for any signs of damage or blockage.
• If a clogged catalytic converter is suspected, perform a backpressure test.
• Replace the catalytic converter if backpressure exceeds specifications.

6. Sensor Assessment

• Use a multimeter to test the MAF and O2 sensors for proper voltage and resistance.
• Replace any faulty sensors with OEM parts.