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2018 Rogue SV Rough Idle & Misfire - DIY Spark Plug/Coil Pack Help?

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Mike T. · rep 0 · May 24, 1:21 PM · 1 replies · solved · Question

Vehicle: 2018 Nissan Rogue SV

Hey everyone,

My 2018 Nissan Rogue SV, with about 85,000 miles on it, has recently started acting up. I'm experiencing a noticeable rough idle, especially when I'm stopped at a light. It feels like the engine is shaking a bit more than usual, and I've also felt a slight hesitation during acceleration sometimes.

The check engine light came on a couple of days ago, and when I scanned it, I got a P0302 code, indicating a misfire in cylinder 2. I'm wondering if this is something I can tackle myself. I'm reasonably handy with basic car maintenance.

Could this just be a bad spark plug, or should I be looking at the ignition coil for cylinder 2? Any advice on how to diagnose it further or if changing these components is a straightforward DIY for a Rogue of this year? What tools would I need?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:21 PM

0

ClearTheCode admin answer:

It sounds like you're on the right track with diagnosing your 2018 Nissan Rogue SV's rough idle and P0302 misfire code. A misfire in a specific cylinder (P0302 points to cylinder 2) is commonly caused by a few key components, often related to maintenance.

Here’s a breakdown of steps and considerations:

  1. Confirm the Misfire Source:

    • Swap Ignition Coils: A common DIY diagnostic step is to swap the ignition coil from cylinder 2 with a coil from a different, non-misfiring cylinder (e.g., cylinder 1 or 3). Clear the code, drive the car, and re-scan. If the misfire code moves to the new cylinder (e.g., P0301 or P0303), then the coil is likely faulty. If it stays P0302, the issue is likely the spark plug or fuel injector for cylinder 2.
    • Inspect Spark Plug: If the coil swap doesn't move the code, remove the spark plug from cylinder 2. Look for signs of wear, fouling (oil, carbon, fuel), or damage to the electrode. A worn or fouled plug can definitely cause a misfire.

  2. Spark Plug Replacement (DIY):

    • Tools Needed: You'll typically need a spark plug socket (usually 14mm or 16mm, thin-walled), a ratchet, an extension, and a torque wrench. A magnetic or rubber-insert spark plug socket is highly recommended to prevent dropping plugs.
    • Procedure: Ensure the engine is cool. Disconnect the negative battery terminal. Remove the engine cover. Disconnect the electrical connector from the ignition coil, then remove the bolt holding the coil in place. Carefully pull out the coil. Use your spark plug socket to remove the old plug. Install the new plug by hand first to avoid cross-threading, then tighten to the manufacturer's specified torque (check your owner's manual or a service guide, usually around 15-20 ft-lbs for Nissan). Apply a small amount of anti-seize to the spark plug threads and dielectric grease to the inside of the coil boot for easier future removal and better connection.
    • Parts: Always use OEM or equivalent quality spark plugs (e.g., NGK or Denso, which are often OEM suppliers for Nissan). Using incorrect plugs can lead to performance issues or even engine damage.

  3. When to See a Shop:

    • If the misfire persists after replacing the spark plug and/or ignition coil for cylinder 2.
    • If you suspect a fuel injector issue (requires specialized tools for testing or replacement).
    • If you notice other symptoms like significant power loss, unusual noises, or if the check engine light is flashing (indicating a severe misfire that could damage the catalytic converter).
    • If you're uncomfortable performing the DIY steps or lack the necessary tools.

Addressing misfires promptly is important as prolonged misfires can lead to catalytic converter damage over time.

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