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DIY Spark Plug Replacement on G70 3.3T - What's the process?

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Dan C. · rep 0 · May 22, 6:22 AM · 1 replies · solved · Question

Vehicle: 2020 Genesis G70 3.3T Advanced

Hey everyone,

I'm looking to tackle a spark plug replacement on my 2020 Genesis G70 3.3T Advanced. I'm fairly handy with car maintenance, but I've heard the 3.3T engine can be a bit tight to work on, especially with the twin turbos.

Has anyone here done this DIY? What's the level of difficulty? Are there any special tools I'll need beyond a standard spark plug socket set and torque wrench? Also, what specific spark plugs are recommended for this engine? I want to make sure I'm using the right ones to avoid any issues.

Any tips, tricks, or step-by-step guidance would be greatly appreciated before I dive in. Just trying to save a bit on labor costs if it's something I can manage myself.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:22 AM

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ClearTheCode admin answer:

Replacing spark plugs on your 2020 Genesis G70 3.3T can be a rewarding DIY project, but it does require patience and the right tools due to the engine's configuration. Here's a general guide:

  1. Gather Your Tools & Parts: You'll need a torque wrench, various extensions, a spark plug socket (usually 14mm thin-wall for these engines), a ratchet, dielectric grease, and the correct spark plugs. For the 3.3T, OEM equivalent plugs like NGK SILZKR8G8G or Denso VXUH22 are commonly recommended. Always confirm the correct part number for your specific VIN.
  2. Safety First: Ensure the engine is cool. Disconnect the negative terminal of your battery to prevent accidental electrical issues.
  3. Access: Remove the engine cover. You'll then need to disconnect and remove the ignition coils. This involves unplugging the electrical connector and unbolting each coil pack. Carefully pull them straight up.
  4. Remove Old Plugs: Using your spark plug socket and extensions, carefully loosen and remove each spark plug. Be mindful not to drop anything into the cylinder.
  5. Install New Plugs:
    • Gap Check: While most modern plugs come pre-gapped, it's wise to double-check the gap against your vehicle's specifications (usually found in the owner's manual or a service manual).
    • Anti-Seize: Generally, anti-seize is not recommended for modern spark plugs with nickel-plated threads, as it can alter torque readings. Consult your plug manufacturer's instructions.
    • Torque: Hand-thread the new plugs in to avoid cross-threading, then use your torque wrench to tighten them to the manufacturer's specified torque (typically around 10-15 lb-ft for these engines). Over-tightening can damage the cylinder head.
  6. Reassembly: Apply a small amount of dielectric grease inside the boot of each ignition coil before reinstalling them over the new spark plugs. Reconnect the electrical connectors and reinstall the engine cover. Reconnect the battery.

When to See a Shop: If you encounter any stripped threads, are uncomfortable with the process, or if you experience persistent misfire codes (e.g., P0301, P0302, etc.) after the replacement, it's best to consult a professional mechanic. They have specialized tools and experience to diagnose and resolve more complex issues.

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