how to fix the jerking motion in BMW 3 Series F30/F31 (2012-2019) while driving

BMW 3 Series F30/F31 (2012-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

medium

Severity

4 min read

696 words

Problem Statement

The vehicle exhibits a jerking motion during driving, indicating a potential issue with the engine, transmission, or fuel delivery system in a BMW 3 Series F30/F31 (2012-2019).

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before performing any work on the cooling system or engine components.

Symptoms

•Jerking or lurching while accelerating
•Rough shifts or hesitation during gear changes
•Check engine light illuminated
•Increased engine RPMs without corresponding acceleration
•Poor fuel economy
•Engine stalling or misfiring

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored fault codes.
2
Inspect the transmission fluid level and condition; low or burnt fluid can affect shifting.
3
Check for vacuum leaks in the intake system that may cause air-fuel mixture issues.
4
Test the ignition system components, including spark plugs and ignition coils, for wear or failure.
5
Inspect fuel delivery components, such as the fuel pump and fuel filter, for proper operation and blockage.
6
Evaluate the engine mounts for wear, which can contribute to jerking motion.

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

•OBD-II scanner
•Socket set
•Torque wrench
•Fuel pressure gauge
•Multimeter (for electrical testing)
•Smoke machine (for vacuum leak testing)

Parts Required

•Spark plugs
•Ignition coils
•Transmission fluid
•Fuel filter
•Gasket for transmission pan

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored fault codes.
2
Inspect the transmission fluid level and condition; low or burnt fluid can affect shifting.
3
Check for vacuum leaks in the intake system that may cause air-fuel mixture issues.
4
Test the ignition system components, including spark plugs and ignition coils, for wear or failure.
5
Inspect fuel delivery components, such as the fuel pump and fuel filter, for proper operation and blockage.
6
Evaluate the engine mounts for wear, which can contribute to jerking motion.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on a level surface and securely supported with jack stands if elevated.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Spark Plugs

Remove the engine cover to access the spark plugs.
Use a spark plug socket and ratchet to remove each spark plug.
Inspect the spark plugs for wear and carbon buildup. Replace with OEM specifications if needed.
Gap the new spark plugs according to manufacturer specifications.
Install the new spark plugs and torque them to the specified value (typically around 25 Nm).

3. Inspect and Replace Ignition Coils

Remove the ignition coil connectors from each coil.
Use a socket to remove the bolts securing the ignition coils.
Pull out the ignition coils from the spark plug wells.
Inspect and replace any faulty coils with OEM parts.
Reinstall the coils and connectors, ensuring they are seated properly.

4. Transmission Fluid Check and Replacement

Locate the transmission dipstick or fill plug (if applicable).
Check the fluid level; add the correct type of transmission fluid if low.
If the fluid is burnt or discolored, perform a transmission fluid change:
- Drain the old fluid by removing the transmission pan.
- Replace the transmission filter if applicable.
- Reinstall the pan with a new gasket and torque to specifications (typically around 10 Nm).
- Fill the transmission with the correct type and amount of fluid as per manufacturer guidelines.

5. Inspect and Repair Vacuum Leaks

Conduct a visual inspection of all vacuum hoses for cracks or disconnections.
Use a smoke machine to identify any hidden leaks in the intake system.
Replace any damaged hoses or seals as necessary.

6. Fuel System Inspection

Check the fuel pump operation by listening for the pump when the ignition is turned on.
Inspect the fuel filter for clogs and replace if necessary.
Test the fuel pressure using a fuel pressure gauge to ensure it meets specifications.