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Home/Cars/BMW/3 Series/E90/E91 (2005-2012)/why does my BMW 3 Series E90/E91 (2005-2012) transmission fluid smell burnt

why does my BMW 3 Series E90/E91 (2005-2012) transmission fluid smell burnt

BMW 3 Series E90/E91 (2005-2012)

Severity: mediumDifficulty: medium2-4 hours
3 min read
523 words

Problem Statement

## Problem Statement The transmission fluid in your BMW 3 Series E90/E91 (2005-2012) has developed a burnt smell, indicating potential overheating or degradation of the fluid.

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening the transmission or working on the vehicle.

Symptoms

  • •Transmission slipping or rough shifting
  • •Overheating warning light illuminated
  • •Fluid leakage under the vehicle
  • •Unusual noises from the transmission (grinding or whining)
  • •Poor acceleration or loss of power
  • •Delay in gear engagement

Diagnostic Steps

  1. 1Visual Inspection**: Check the transmission fluid level and condition. Look for discoloration or a burnt odor.
  2. 2Fluid Temperature Check**: Use a temperature gauge to check the transmission fluid temperature during operation.
  3. 3Scan for Error Codes**: Use an OBD-II scanner to check for any transmission-related fault codes.
  4. 4Inspect Cooling System**: Verify that the transmission cooler is functioning properly and not blocked.
  5. 5Check for Leaks**: Look for signs of fluid leaks around the transmission pan and seals.
  6. 6Test Drive**: Conduct a test drive to monitor shifting patterns and any abnormal noises.

Solution

Solution

1. Preparation

  • Tools Required: Jack and jack stands, socket set, transmission fluid pump, OBD-II scanner, temperature gauge.
  • Safety Warnings: Ensure the vehicle is securely lifted and supported before working underneath.

2. Drain Old Fluid

  • Place a drain pan under the transmission pan.
  • Remove the transmission pan bolts using a socket set.
  • Carefully lower the pan to drain the old fluid.

3. Inspect and Clean Components

  • Inspect the transmission filter for clogs or damage; replace if necessary.
  • Clean the transmission pan and magnet (if equipped) to remove debris.
  • Check the gasket and replace it if damaged.

4. Replace Fluid

  • Using a transmission fluid pump, fill the transmission with the recommended type of fluid (check owner’s manual for specifications).
  • Ensure to fill to the correct level using the dipstick, if applicable.

5. Reassemble Components

  • Reattach the transmission pan with new gasket or sealant.
  • Torque the bolts to the manufacturer's specifications (typically around 8-10 Nm, but verify in service manual).

6. Test System

  • Start the engine and allow it to reach operating temperature.
  • Shift through all gears while checking for proper engagement and monitoring for leaks.

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

  • Jack and jack stands
  • Socket set
  • Transmission fluid pump
  • OBD-II scanner
  • Temperature gauge

Parts Required

  • Transmission fluid (specific type as per BMW specifications)
  • Transmission filter (if needed)
  • Transmission pan gasket (if needed)

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

3 items

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