Changing spark plugs on your BMW M4 can seem intimidating, but with the right tools and guidance, it’s a straightforward process. This tutorial is tailored for beginners and is an excellent opportunity to learn about your car while saving money on labor costs.
Typical Labor Costs for Spark Plug Replacement
If you choose to have a professional replace your spark plugs, expect labor costs to range between $150 and $250, depending on the shop and location. By following this guide, you can save on these costs and enjoy the satisfaction of doing it yourself.
Tools and Parts You’ll Need:
- Genuine BMW Spark Plugs (e.g., NGK 97506 – 1 Step Colder – Part Number: 12120039634).
- Spark Plug Socket (with a rubber insert or magnet to hold the spark plug).
- Ratchet Wrench.
- Torque Wrench (for proper tightening).
- 10mm Socket and Extension (for coil pack bolts).
- T-handle or Universal Joint (optional for hard-to-reach areas).
- Dielectric Grease (optional but recommended).
- Gloves and Safety Goggles.
- Shop Towel or Compressed Air (to clean the area).
- Anti-Seize Compound (for the spark plug threads, if not pre-coated).
Step-by-Step Instructions:
Step 1: Prepare Your Workspace
- Park your BMW M4 on a flat surface and ensure the engine is cool to the touch.
- Gather all tools and parts, ensuring you have the correct spark plugs and socket.
- Disconnect the negative terminal of the battery for safety.
Step 2: Remove the Engine Cover
- Pop the hood and locate the engine cover.
- Gently pull up on the cover to release it from the mounting points.
- Set the cover aside in a safe place.
Step 3: Access the Ignition Coils
- Locate the ignition coils (one per cylinder, aligned on the engine).
- Use a 10mm socket to remove the bolts securing each ignition coil.
- Carefully pull the ignition coils upward to expose the spark plugs beneath.
- If they resist, wiggle gently while pulling straight up.
Step 4: Remove the Old Spark Plugs
- Use a shop towel or compressed air to clean any debris around the spark plug wells.
- Insert the spark plug socket (with a ratchet and extension) into the well.
- Turn counterclockwise to loosen and remove the old spark plug.
- Inspect the old spark plug for wear and damage, noting any unusual discoloration (this can indicate engine issues).
Step 5: Install the New Spark Plugs
- Check the gap on the new spark plugs (BMW-approved plugs usually come pre-gapped).
- Apply a small amount of anti-seize compound to the threads if not pre-coated.
- Carefully lower the new spark plug into the well using the spark plug socket to avoid dropping it.
- Tighten the spark plug by hand until snug, then use a torque wrench to tighten to 17 ft-lbs (as specified by BMW).
- Avoid overtightening, as this can damage the threads.
Step 6: Reinstall the Ignition Coils
- Apply a small dab of dielectric grease to the inside of each coil boot (optional but helps ensure a good connection).
- Push the ignition coils back onto the spark plugs firmly until they click into place.
- Secure the coils with the 10mm bolts.
Step 7: Reattach the Engine Cover
- Align the engine cover with the mounting points and press down until it snaps into place.
Step 8: Reconnect the Battery and Test
- Reconnect the negative terminal of the battery.
- Start the engine and let it idle for a few minutes to ensure everything is functioning properly.
- Listen for any unusual sounds or misfires.
Tips for Beginners:
- Work slowly and double-check each step.
- Keep the removed spark plugs in case you want to compare their condition to future replacements.
- If you’re unsure about anything, consult your BMW’s owner manual or seek advice from a trusted mechanic.
Why Choose Our Spark Plugs and Tools?
- Precision Fit: Our genuine BMW spark plugs are specifically designed for the M4’s S55 engine, ensuring optimal performance.
- Enhanced Durability: NGK 97506 spark plugs are 1 step colder, perfect for tuned or high-performance engines.
- Premium Spark Plug Socket: The included rubber insert or magnet ensures easy installation without damaging the plugs.
Get your genuine BMW spark plugs and premium socket today and give your M4 the care it deserves!
