Rough Idle & Misfires on 2020 QX60 - Time for new spark plugs?

ClearTheCode admin answer:

Rough idle, hesitation, and potential misfires are classic symptoms of worn spark plugs. While your 2020 Infiniti QX60 Luxe might not have triggered a Check Engine Light yet, these symptoms indicate that it's a good time to address the issue.

1. Spark Plug Interval: For most Infiniti V6 engines, including the 3.5L VQ35DD in your 2020 QX60, the recommended spark plug replacement interval is typically around 60,000 to 105,000 miles, depending on the specific plug type (e.g., iridium plugs last longer). At 65,000 miles, you are definitely within the window where replacement is beneficial.
2. Symptoms of Worn Plugs: Besides what you've described, other signs include reduced fuel economy, difficulty starting, and a general lack of power. If a misfire becomes severe enough, it will trigger a Check Engine Light and likely store a P030x code (e.g., P0301 for cylinder 1 misfire).
3. Recommended Plugs: Always use OEM (Original Equipment Manufacturer) equivalent iridium spark plugs. Brands like NGK or Denso are typically the OEM suppliers for Infiniti. Ensure you get the correct part number for your specific 2020 QX60 model to guarantee proper fit and performance.
4. DIY vs. Shop: Replacing spark plugs on a V6 engine can be a moderately challenging DIY task, especially for the rear bank of cylinders which are often harder to access. You'll need specific tools like a spark plug socket, torque wrench, and potentially an extension and swivel. If you're not comfortable, a professional mechanic can perform this service efficiently.
5. Beyond Plugs: While spark plugs are the most likely culprit, also consider inspecting ignition coils and fuel injectors if the problem persists after plug replacement. A diagnostic scan, even without a CEL, can sometimes reveal pending codes or misfire counts that help pinpoint the exact cylinder.