why does my BMW 3 Series E90/E91 (2005-2012) make a whirring noise when accelerating

BMW 3 Series E90/E91 (2005-2012)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

555 words

Problem Statement

The BMW 3 Series E90/E91 (2005-2012) exhibits a whirring noise during acceleration, indicating a potential issue with the drivetrain or engine components.

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting belts or components.

Symptoms

•Whirring noise becomes more pronounced during acceleration.
•Noise may vary with engine RPM.
•Possible vibrations felt through the cabin.
•Decreased engine performance or responsiveness.
•Check engine light may illuminate intermittently.

Diagnostic Steps

1
Inspect the serpentine belt for wear or damage.
2
Use an OBD-II scanner to check for any stored error codes.
3
Examine the transmission fluid level and condition.
4
Inspect the wheel bearings for play or roughness.
5
Check the engine mounts for deterioration or failure.
6
Listen for noise from the alternator and other accessories while the engine is running.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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

•Socket set
•serpentine belt tool.

Parts Required

•Serpentine belt
•Transmission fluid
•Engine mounts (if necessary)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the serpentine belt for wear or damage.
2
Use an OBD-II scanner to check for any stored error codes.
3
Examine the transmission fluid level and condition.
4
Inspect the wheel bearings for play or roughness.
5
Check the engine mounts for deterioration or failure.
6
Listen for noise from the alternator and other accessories while the engine is running.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Serpentine Belt

Sub-steps:
- Locate the serpentine belt and inspect for cracks, fraying, or glazing.
- If damaged, use a socket set to release tension from the tensioner and remove the old belt.
- Install a new serpentine belt by routing it according to the belt routing diagram found on the engine compartment.
Tools Required: Socket set, serpentine belt tool.

3. Check and Replace Transmission Fluid

Sub-steps:
- Locate the transmission fluid dipstick (if applicable) and check the fluid level.
- If low or dirty, drain the old fluid using a transmission pump or drain plug.
- Replace with manufacturer-recommended transmission fluid, ensuring the correct amount is refilled.
Tools Required: Transmission pump or socket set, fluid catch pan.
Note: Ensure the vehicle is level during the fluid check.

4. Inspect Engine and Accessory Components

Sub-steps:
- Check the alternator and other accessories for noise using a mechanic’s stethoscope.
- If any components are found to be faulty, remove and replace them as necessary, following the manufacturer’s service manual for specific removal procedures.
Tools Required: Mechanic’s stethoscope, socket set.

5. Inspect and Replace Engine Mounts (if necessary)

Sub-steps:
- Visually inspect the engine mounts for cracks or liquid leaks.
- If damaged, lift the engine slightly using a jack and remove the old mounts using a socket set.
- Install the new engine mounts and lower the engine back into place.
Tools Required: Engine hoist or jack, socket set.