FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/why does my BMW 3 Series F30/F31 (2012-2019) use so much gas?

why does my BMW 3 Series F30/F31 (2012-2019) use so much gas?

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: medium3-5 hours
3 min read
564 words

Problem Statement

## Problem Statement The BMW 3 Series F30/F31 (2012-2019) is experiencing poor fuel economy, leading to excessive fuel consumption.

Repair Time
3-5 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow engine to cool before starting any work on the intake or fuel system.

Symptoms

  • •Check engine light illuminated
  • •Engine stalling or rough idle
  • •Decreased acceleration or power
  • •Unusual engine noises (e.g., knocking or pinging)
  • •Increased emissions (visible exhaust fumes)
  • •Fuel odor around the vehicle

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify any underlying issues.
  2. 2Check tire pressure to ensure they are at the recommended levels.
  3. 3Inspect the air filter for clogs or restrictions affecting airflow.
  4. 4Test fuel pressure using a fuel pressure gauge to determine if the fuel pump is functioning correctly.
  5. 5Examine the fuel injectors for leaks or malfunctions.
  6. 6Inspect the mass airflow sensor (MAF) for dirt or damage that could affect fuel mixture.
  7. 7Review the engine's maintenance history for overdue services (e.g., spark plugs, oil change).

Solution

Solution

1. Preparation

  • Gather tools and parts needed for repair.
  • Ensure the vehicle is parked on a level surface, and the engine is cool.
  • Disconnect the battery to prevent any electrical mishaps.

2. Replace Air Filter

  • Locate the air filter housing.
  • Remove screws or clips securing the housing.
  • Take out the old air filter and clean the housing.
  • Install a new air filter, ensuring it fits snugly.
  • Reattach the housing securely.

3. Clean Mass Airflow Sensor

  • Locate the MAF sensor in the air intake.
  • Disconnect the electrical connector carefully.
  • Remove the MAF sensor from the housing.
  • Use MAF cleaner spray to clean the sensor element. Allow it to dry completely.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect and Clean Fuel Injectors

  • Remove the engine cover (if applicable) to access fuel injectors.
  • Disconnect the fuel line from the injectors using the appropriate tool.
  • Remove the injectors from the fuel rail.
  • Use a fuel injector cleaner or send them to a professional for ultrasonic cleaning.
  • Reinstall the injectors with new O-rings to prevent leaks.

5. Replace Spark Plugs

  • Remove the ignition coils by unscrewing them and disconnecting the electrical connectors.
  • Extract the old spark plugs using a spark plug socket.
  • Check the gap on new spark plugs and adjust if necessary.
  • Install new spark plugs and reconnect the ignition coils.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Fuel pressure gauge
  • MAF cleaner spray

Parts Required

  • Air filter
  • Fuel injector O-rings
  • Spark plugs

Additional Information

Repair Time

3-5 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

3 items

Related Faults

Discover similar issues

  1. what should I do if my BMW 3 Series F30/F31 (2012-2019) transmission is slipping

    ## Problem Statement The transmission in a BMW 3 Series F30/F31 (2012-2019) is slipping, indicating potential issues with the transmission fluid, inte...

    Symptoms
    • •Check engine light illuminated
    • •Delay in acceleration or shifting
    • +{count} more
  2. why does my BMW 3 Series F30/F31 (2012-2019) shake when I brake

    ## Problem Statement The BMW 3 Series F30/F31 (2012-2019) is experiencing shaking or vibrations during braking, indicating potential issues with the b...

    Symptoms
    • •Vehicle shakes or vibrates when braking
    • •Steering wheel vibrates during braking
    • +{count} more
  3. why does my BMW 3 Series F30/F31 (2012-2019) overheat when idling

    ## Problem Statement The BMW 3 Series F30/F31 (2012-2019) is experiencing overheating issues specifically when idling, which may indicate problems wit...

    Symptoms
    • •Engine temperature gauge reading higher than normal
    • •Coolant warning light illuminated
    • +{count} more
  4. why is my BMW 3 Series F30/F31 (2012-2019) not accelerating properly

    ## Problem Statement The BMW 3 Series F30/F31 (2012-2019) is experiencing an acceleration issue, where the vehicle does not respond adequately when th...

    Symptoms
    • •Check engine light illuminated
    • •Engine stalling during acceleration
    • +{count} more
  5. what to do if my BMW 3 Series F30/F31 (2012-2019) stalls while driving

    ## Problem Statement The BMW 3 Series F30/F31 (2012-2019) is experiencing stalling while driving, which indicates a potential issue with the engine ma...

    Symptoms
    • •Check engine light illuminated
    • •Engine stalling during acceleration or deceleration
    • +{count} more
  6. how to fix BMW 3 Series F30/F31 (2012-2019) AC not blowing cold air

    ## Problem Statement The air conditioning system in a BMW 3 Series F30/F31 (2012-2019) is not blowing cold air, indicating a potential issue with the ...

    Symptoms
    • •AC compressor not engaging
    • •Warm air blowing from vents
    • +{count} more

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation