Infiniti QX80 (2014-2024) Aftermarket Spark Plug Guide
Restore your QX80's V8 power and efficiency by choosing the right spark plugs.
- The recommended spark plug replacement interval for the QX80 is 105,000 miles.
- NGK is the original equipment manufacturer (OEM); using NGK Laser Iridium plugs is the most reliable choice.
- Symptoms of failure include rough idle, hesitation, and a check engine light with P0300-series misfire codes.
- While DIY replacement is possible, accessing the rear plugs can be challenging and requires specific tools like swivels and extensions.
Signs of Failing Spark Plugs in Your QX80
When spark plugs wear out, they can't create a strong enough spark. This can cause a range of noticeable problems. You know your vehicle best, so pay attention to any changes in how it drives.
- Rough Idle: The engine may shake or vibrate more than usual when you're stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. This happens when a cylinder fails to fire properly.
- Check Engine Light: A failing spark plug will often trigger the check engine light. Common codes include P0300 (random misfire) or P0301-P0308 (misfire in a specific cylinder).
- Poor Fuel Economy: Worn plugs can cause fuel to be wasted, leading to more frequent trips to the gas station. A bad plug can decrease fuel economy by as much as 30%.
- Difficulty Starting: If the spark is weak, the engine may have trouble starting, especially when cold.
Choosing the Right Aftermarket Spark Plugs
For the 2014-2024 QX80, the original factory plugs are typically NGK Laser Iridium plugs. When shopping for aftermarket replacements, it's best to stick with Iridium plugs for their long life and performance, which is what your engine was designed for.
Brand Quality Tiers
Pro Tip: What is Iridium?
Iridium is a very hard and durable precious metal. Using it for the tip of a spark plug allows the plug to last much longer (up to 100,000 miles or more) and provide a more consistent spark compared to older copper or platinum plugs.
- Tier 1 (OEM Equivalent): NGK. NGK is the Original Equipment Manufacturer (OEM) for the QX80. Choosing NGK Laser Iridium or Ruthenium HX plugs is the safest bet for guaranteed compatibility and performance. They are designed specifically for your vehicle's ignition system.
- Tier 2 (Reliable Alternatives): Bosch & Denso. Bosch and Denso are both highly respected brands that produce excellent Iridium spark plugs. They are a strong choice if NGK is not available, offering similar performance and longevity. Many owners and shops use them without issue.
- Tier 3 (Budget-Friendly): Champion. Champion offers Iridium plugs that will work in the QX80 and meet the basic requirements. While they are a functional option, most mechanics and Infiniti specialists recommend sticking with NGK or Bosch for the best long-term results in this specific V8 engine. 🎬 Watch: How to replace spark plugs on the 5.6L engine.
Known Issues, Recalls, and Service Bulletins
As of late 2024, there are no specific recalls or widespread Technical Service Bulletins (TSBs) directly related to spark plug failure on the 2014-2024 QX80. However, a TSB for 2017-2018 models (ITB19-016) mentions removing the #7 spark plug as a diagnostic step for an engine knock, but this is related to a more serious potential cylinder wall issue, not the plug itself. There have been recalls for fuel pumps on some 2020-2021 models, which can cause similar symptoms like poor running, but this is not a spark plug issue.
| Part Type | Estimated Cost (Parts Only) |
|---|---|
| New OEM (Infiniti Branded) | $200 - $320 |
| New Aftermarket (Tier 1 - NGK/Denso) | $120 - $200 |
| New Aftermarket (Tier 2/3 - Bosch/Champion) | $64 - $120 |
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my QX80?
The manufacturer-recommended service interval for spark plug replacement is every 105,000 miles. However, if you experience any failure symptoms, they should be inspected and replaced sooner.
Do I need to gap the new spark plugs?
Most high-quality Iridium spark plugs from brands like NGK come pre-gapped from the factory for your specific vehicle. The correct gap for the QX80 is 0.044 inches. It is always a good idea to verify the gap with a feeler gauge before installation, but be very careful not to damage the fine Iridium tip.
🎬 See a DIY spark plug change on a 2015 QX80.Can I replace the spark plugs myself?
Yes, this is a feasible DIY job for someone with moderate mechanical skill and the right tools. However, the QX80's engine bay is large, and reaching the rearmost plugs can be difficult and requires patience, extensions, and swivel sockets. If you are not comfortable, it is best to have a professional do the work.
🎬 Watch this 2016 QX80 spark plug replacement walkthrough.Should I use anti-seize on the new spark plug threads?
Major manufacturers like NGK advise against using anti-seize on their modern spark plugs. The plugs have a special plating on the threads that prevents seizing and provides proper grounding. Using anti-seize can lead to over-torquing the plugs, which can damage the plug or your engine's cylinder head.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22401-1LA1C
The 2014-2024 Infiniti QX80 requires a set of 8 Iridium-type spark plugs. The factory-installed plug is the NGK DILKAR7B11 (NGK part number 1406). The correct spark plug gap is 0.044 inches.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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