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Check Engine Light & Misfire on 2019 Nautilus 2.7L

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Mike T. · rep 0 · May 25, 4:31 AM · 1 replies · solved · Question

Vehicle: 2019 Lincoln Nautilus Reserve

My 2019 Lincoln Nautilus Reserve with the 2.7L EcoBoost engine and around 60,000 miles recently threw a check engine light. It's also developed a noticeable rough idle and feels like it's hesitating or stumbling under acceleration. I got the code read at a local auto parts store, and it came back as P0301, indicating a misfire on cylinder 1.

Is this likely just spark plugs, or should I be looking at ignition coils too? What's the recommended spark plug replacement interval for this engine, and are there specific plugs I should use? I'm comfortable doing some DIY work.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:31 AM

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ClearTheCode admin answer:

A P0301 code on your 2019 Lincoln Nautilus Reserve 2.7L EcoBoost at 60,000 miles is a classic sign of a misfire in cylinder 1. This can indeed be caused by spark plugs, ignition coils, or fuel delivery issues.

  1. Understanding P0301: This diagnostic trouble code (DTC) specifically means "Cylinder 1 Misfire Detected." While it points to cylinder 1, the root cause can sometimes affect other cylinders or be a systemic issue.

  2. Spark Plugs vs. Ignition Coils:

    • Spark Plugs: For the 2.7L EcoBoost, Lincoln generally recommends spark plug replacement around 60,000 to 70,000 miles under normal driving conditions. Given your mileage, it's highly probable that worn spark plugs are contributing to the misfire.
    • Ignition Coils: A failing ignition coil for cylinder 1 is also a very common cause of a P0301. Coils can degrade over time, especially with heat cycles.

  3. Recommended Spark Plugs: Always use OEM-equivalent or specified spark plugs for your 2.7L EcoBoost. Motorcraft SP-550 (CYFS-12Y-PT) or NGK equivalent Iridium plugs are typically recommended. Using incorrect plugs can lead to performance issues or even engine damage.

  4. DIY Diagnostic Steps:

    • Swap Components: Since you're comfortable with DIY, a good diagnostic step is to swap the ignition coil from cylinder 1 to another cylinder (e.g., cylinder 3) and clear the code. If the misfire code changes to P0303, you've identified a faulty coil. If it remains P0301, the issue is likely the spark plug or fuel injector.
    • Inspect Spark Plug: When you remove the spark plug from cylinder 1, inspect its condition. Look for signs of fouling, excessive wear, or damage.
    • Check Wiring: Briefly inspect the wiring harness leading to the coil and injector for any visible damage.

  5. When to See a Shop:

    • Persistent Misfire: If replacing the spark plugs and coils doesn't resolve the P0301, or if you suspect a fuel injector issue (less common but possible), professional diagnosis is needed.
    • Compression Test: A shop can perform a compression test to rule out internal engine issues like a valve problem or head gasket leak, though this is rare at 60,000 miles without other symptoms.
    • Advanced Diagnostics: They have specialized tools to test fuel pressure, injector pulse, and perform more in-depth electrical diagnostics.
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