BMW E90 Ignition Coil Woes Solved: Discover the Easy Way to Change It

Ignition coils play a crucial role in the efficient operation of your BMW E90. If you’re experiencing engine misfires, rough idling, or reduced performance, it may be time to replace the ignition coils. While this task may seem daunting, it’s actually quite manageable with the right tools and a little know-how. This comprehensive guide will walk you through the steps on how to change ignition coil bmw e90, ensuring a smooth and successful repair.

Tools and Materials Required

• New ignition coils (refer to your BMW E90’s specific model and engine)
• Socket wrench set (10mm, 13mm, 16mm)
• Spark plug socket (16mm)
• Torque wrench
• Dielectric grease
• Gloves
• Safety glasses

Safety Precautions

• Always wear gloves and safety glasses when working on your vehicle.
• Ensure the engine is completely cool before starting any work.
• Disconnect the negative terminal of your battery to prevent any electrical shorts.

Step-by-Step Instructions

1. Locate and Remove the Engine Cover

• Open the hood of your BMW E90.
• Locate the engine cover and unclip it from the engine.
• Remove the engine cover.

2. Identify the Ignition Coils

• The ignition coils are located on top of the engine, one for each cylinder.
• They are typically black or gray in color and have a wire harness connected to them.

3. Disconnect the Electrical Connectors

• Use a 10mm socket wrench to loosen the electrical connector bolts.
• Gently pull the connectors off the ignition coils.

4. Remove the Ignition Coils

• Use a 13mm socket wrench to loosen the ignition coil bolts.
• Carefully remove the ignition coils from the engine.

5. Apply Dielectric Grease

• Apply a small amount of dielectric grease to the rubber boot of the new ignition coil.
• This will help prevent moisture and corrosion.

6. Insert the New Ignition Coils

• Insert the new ignition coils into the engine.
• Hand-tighten the ignition coil bolts.

7. Torque the Bolts

• Use a torque wrench to tighten the ignition coil bolts to the specified torque (10 Nm).

8. Connect the Electrical Connectors

• Push the electrical connectors onto the ignition coils until they click into place.
• Tighten the connector bolts using a 10mm socket wrench.

9. Reinstall the Engine Cover

• Place the engine cover back on the engine.
• Clip the engine cover into place.

10. Reconnect the Battery

• Connect the negative terminal of the battery.

11. Start the Engine

• Start the engine and let it idle for a few minutes.
• Check for any engine misfires or rough idling.

Troubleshooting

• If you experience engine misfires after replacing the ignition coils, check the electrical connectors to ensure they are properly connected.
• If the problem persists, the new ignition coils may be defective.
• If you have any difficulties with the replacement process, consult a qualified mechanic.

Tips for Success

• Replace all the ignition coils at once, even if only one is failing.
• Use high-quality ignition coils from a reputable manufacturer.
• Follow the torque specifications carefully to prevent overtightening or undertightening the bolts.
• If you are not comfortable performing this repair yourself, seek professional assistance.

Wrapping It Up

Replacing the ignition coils on your BMW E90 is a straightforward task that can be completed in about an hour. By following the steps outlined in this guide, you can restore your engine to optimal performance and ensure a smooth ride. Remember to always prioritize safety and consult a mechanic if you encounter any difficulties.

Frequently Asked Questions

Q: How often should I replace the ignition coils on my BMW E90?

A: Ignition coils typically last for 60,000 to 100,000 miles. However, it’s recommended to inspect them regularly and replace them when necessary.

Q: Can I replace the ignition coils without removing the engine cover?

A: Yes, it is possible to replace the ignition coils without removing the engine cover. However, it will be more challenging and may require the use of specialized tools.

Q: What are the symptoms of faulty ignition coils?

A: Faulty ignition coils can cause engine misfires, rough idling, reduced performance, and increased fuel consumption.