🛠 Tools & Parts You'll Need
Video walk through- https://youtu.be/MXaf6zG8syc?si=T4SW928cLTfRT_-4
Parts:
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Upgraded ignition coils (997-style)
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Part Number:
997.602.104.02
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Bolts for new coils (2 per coil)
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Size: M6 x 40mm
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OEM Part Number:
900.385.025.01
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Optional: Spark plugs (highly recommended during coil replacement)
Tools:
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10mm socket
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E10 external Torx socket (for upgraded bolts)
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Allen wrench or hex socket (for old bolts)
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Torque wrench (use caution – don't overtighten into aluminum)
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Light source or flashlight
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Gloves
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Safety glasses
📋 Step-by-Step Instructions
1. Preparation
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Ensure the engine is cool.
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If installed, remove the exhaust system for easier access.
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The car in the video had a muffler delete, making the area more accessible.
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Disconnect the negative battery terminal for safety.
2. Locate the Ignition Coils
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Look behind the exhaust bracket—you’ll see a metal plate with two 10mm bolts.
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Remove these bolts to expose the ignition coils.
3. Remove Old Coils
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Older coils are secured with Allen bolts.
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Disconnect the weatherproof electrical connectors:
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Squeeze the release tab and pull gently.
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Remove the old coils. Note any visible wear or damage (e.g., cracked boots).
4. (Optional) Inspect & Replace Spark Plugs
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While coils are removed, check spark plugs.
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If worn or if you're experiencing misfires (like cylinder 6 in the video), replace them now.
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Non-dealer plugs can be found online for ~$6 each vs. ~$16 from a dealership.
5. Install Upgraded 997 Ignition Coils
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Plug in the new ignition coils (they are longer and thicker than the originals).
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Use the new M6 x 40mm bolts.
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Requires E10 Torx socket.
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Carefully hand-tighten, then torque appropriately (don’t overtighten into the aluminum valve cover).
6. Reassemble
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Reattach the metal plate and any brackets.
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If removed, reinstall the exhaust components.
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Reconnect the battery terminal.
7. Final Checks
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Start the engine and listen for any irregularities.
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If misfire symptoms persist, further diagnostics may be needed (fuel injector, compression, etc.).
⚠️ Tips & Warnings
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Don’t overtighten bolts into the aluminum head — risk of stripping or cracking.
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The upgraded coils offer better performance and durability but may require spacers or shielding to fit under the original dust cover.
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If you're unsure of torque specs, consult a factory service manual or a Porsche tech forum.
✅ Outcome
If successful, your Porsche 996 should now:
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Start more smoothly
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Eliminate misfires (especially cylinder-specific ones)
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Run more efficiently
