Best Spark Plugs For 3.5 Ecoboost F150

If you own a 3.5L EcoBoost F150, you already know the incredible power these twin-turbo engines offer, especially when towing or hauling. However, that high-boost environment is brutal on standard spark plugs, often leading to annoying misfires, hesitation, and reduced power if you skip maintenance. I’ve personally experimented with various options and found that choosing the right spark plug for 3.5 Ecoboost F150 maintenance is critical for maintaining peak performance and avoiding common issues. We’ve broken down the best options—from reliable OEM replacements to cold plugs for modified trucks—to help you decide what’s right for your truck.

IMAGE	PRODUCT NAME	AMAZON LINK
	AULINK Set of 6 UF646 Ignition Coil Pack & SP534…	View on Amazon
	6 pc NGK Iridium IX Spark Plugs compatible with Ford…	View on Amazon
	Yoshi Motors DG549 UF646 Ignition Coil Packs & NGK…	View on Amazon
	Ford Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold…	View on Amazon
	6 pc Champion Iridium Spark Plugs compatible with Ford…	View on Amazon
	Ignition Coil Pack Spark Plugs Replacement for 3.5 V6…	View on Amazon
	Set of 6 Ignition Coil Pack Iridium Spark Plug 3.5…	View on Amazon

AULINK Set of 6 UF646 Ignition Coil Pack & SP534 Spark Plug (3.5L V6 Only) For Ford F150 EcoBoost Flex Taurus Explorer Lincoln MKS MKT 2011 2012 2013 2014 2015 2016 2017

If you’re experiencing misfires, sometimes it’s not just the plug; it’s the coil pack, too. This AULINK set provides a comprehensive solution by bundling six new ignition coils (UF646) with six SP534 spark plugs—everything you need for a full ignition system overhaul. This kit is built to meet or exceed OEM specifications, offering excellent value and reliability, especially for owners of 2011–2017 F-150s looking for a cost-effective, complete fix. The plugs feature a trivalent metal plating to help prevent corrosion and seizure in the cylinder head.

Key features that stand out:
* Comprehensive Kit: Includes both 6 Ignition Coils and 6 Plugs.
* OEM Equivalent: Designed to meet high TS16949 certified manufacturing standards.
* Corrosion Resistance: Features trivalent metal plated spark plugs.
* Wide Fitment: Covers many 3.5L V6 EcoBoost applications beyond the F-150.

Pros:
– Excellent price point for a complete coil and plug replacement.
– Simplified installation since all necessary parts are included.
– High-temperature and impact-resistant coil construction.

Cons:
– Longevity might be slightly less than top-tier name brands.

Best for: The F150 owner needing a complete, budget-friendly ignition system refresh to cure persistent misfires.

Expert Opinion: This bundle is ideal for preventive maintenance on higher-mileage 3.5 EcoBoost engines. Replacing coils and plugs simultaneously is often the smartest move to restore lost horsepower and smooth idle.

6 pc NGK Iridium IX Spark Plugs compatible with Ford F-150 3.5L V6 2011-2019

NGK is a legend in high-performance ignition, and their Iridium IX line is often the go-to upgrade for F-150 owners seeking reliability and improved throttle response. These plugs utilize a fine-wire iridium center electrode, which requires less voltage to fire and provides superior resistance to fouling, even under heavy turbo boost conditions. While these are not pre-gapped for the specific EcoBoost requirements (typically 0.028″–0.030″ for stock), the quality construction ensures consistent performance once properly adjusted.

Key features that stand out:
* High Performance: Iridium construction for stable, intense spark.
* Fouling Resistance: Designed to minimize carbon buildup, crucial for direct injection engines.
* Durability: Excellent heat range to handle the pressures of turbocharging.

Pros:
– Trusted brand reputation for quality and longevity.
– Improved throttle response over standard plugs.
– Handles heat dissipation extremely well.

Cons:
– Requires careful gapping adjustment before installation.

Best for: Drivers looking for an incremental performance upgrade using a globally recognized premium spark plug brand.

Expert Opinion: If you are running a slightly modified or tuned 3.5L EcoBoost, the NGK Iridium IX provides the reliable, consistent spark delivery that demanding engines require, making them a very popular choice among enthusiasts.

Yoshi Motors DG549 UF646 Ignition Coil Packs & NGK Iridium Spark Plugs Compatible With Ecoboost Ford F150 F-150 Explorer Expedition Navigator 3.5 3.5L V6 2011 2012 2013 2014 2015 2016 2017 Set of 6

The Yoshi Motors kit combines third-party, OEM-spec ignition coils with the highly respected NGK Iridium Spark Plugs. This marriage aims to give you the best of both worlds: the quality of premium NGK plugs providing optimal spark efficiency, paired with cost-effective replacement coil packs (DG549/UF646). By replacing the entire system, you eliminate doubt about whether a rough idle is coil or plug related, restoring vehicle drivability and saving potential future repair costs.

Key features that stand out:
* Premium Plugs: Includes six genuine NGK Iridium Spark Plugs.
* Coil Materials: Coils manufactured with high electrical resistance and tolerance against high heat temperatures.
* Direct Replacement: Engineered for a truly seamless and versatile fitment.

Pros:
– Combines high-quality plugs with new coils for maximum reliability.
– Effectively avoids performance issues caused by aging coils.
– Great value considering the inclusion of NGK plugs.

Cons:
– Coils are aftermarket, not OEM Ford units.

Best for: Owners who insist on using NGK quality plugs but also need to replace their aging factory coil packs in a single transaction.

Expert Opinion: This is a smart choice for the discerning DIY mechanic. You get the proven performance characteristics of NGK iridium plugs while updating the potentially failing coils—a key weak point in high-mileage EcoBoost engines.

Ford Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set

When you tune your 3.5 EcoBoost, the amount of boost and combustion heat increases dramatically. Standard plugs can quickly overheat, leading to detonation. The Ford Racing Cold Spark Plugs are specifically designed with a colder heat range to dissipate this excess heat more effectively. These are not standard maintenance items; they are essential for trucks running custom tunes, larger turbos, or pushing extreme power levels above the factory settings. These plugs ensure engine safety and performance under high-stress conditions.

Key features that stand out:
* Colder Heat Range: Engineered specifically for high-performance and tuned 3.5L EcoBoost engines.
* Performance Focus: Crucial component for preventing pre-ignition/detonation in highly boosted applications.
* Genuine Ford Part: Ford Racing official product ensures high quality standards.

Pros:
– Required upgrade for trucks running aggressive tunes.
– Helps maintain engine integrity under high boost.
– Direct replacement fitment for specified years.

Cons:
– Not necessary for completely stock trucks and can sometimes cause slight fouling if used purely for mild, low-speed driving.

Best for: F-150s running performance tunes (Stage 1, 2, or higher) that significantly increase turbo boost.

Expert Opinion: If you’ve modified your EcoBoost, these plugs are non-negotiable. They are a necessary safety measure, not just an accessory, to manage the increased thermal load associated with aftermarket tuning.

6 pc Champion Iridium Spark Plugs compatible with Ford F-150 2.7L 3.5L V6 2011-2020

Champion offers a durable, high-quality iridium plug designed for long life and enhanced performance across a wide range of EcoBoost years. These plugs feature a fine-wire center electrode and a V-trimmed ground electrode, optimizing the flame kernel for faster, cleaner combustion. This design minimizes quenching and misfires, ensuring your truck maintains strong power output and reliable cold starts, regardless of the high-pressure environment created by the turbochargers.

Key features that stand out:
* Optimized Design: Fine-wire center electrode and V-trimmed ground electrode for efficient combustion.
* OE Quality: Built with years of expertise in manufacturing OE components.
* Pressure Tolerance: Designed to withstand high-pressure environments like turbocharged motors.

Pros:
– Excellent choice for reliable, long-lasting performance.
– Recognized brand with a strong racing heritage.
– Improves performance while adhering to tough industry standards.

Cons:
– May not be as readily available as NGK or Motorcraft in some local stores.

Best for: Drivers seeking a reliable, OE-quality iridium plug alternative to NGK or Motorcraft that enhances overall engine efficiency.

Expert Opinion: Champion’s commitment to durability is clear in this design. They are a fantastic set-it-and-forget-it option for those who prioritize maintenance intervals and reliable daily driving performance.

Ignition Coil Pack Spark Plugs Replacement for 3.5 V6 Turbo 2011 2012 2013 2014 2015 2016 2017 Ford F150 Ecoboost Expedition Explorer Flex Taurus Transit, Lincoln MKS MKT Navigator, UF646, Set of 6

This package is another robust combination set aimed at providing a full ignition refresh for the 3.5L EcoBoost platform. Focusing on direct replacement compatibility, this kit assures users that the coils (DG-549/UF646) and accompanying SP534-equivalent spark plugs will meet or exceed OEM specifications. The major practical benefit here is addressing all possible ignition-related engine issues—misfiring, rough idle, and poor fuel economy—at once, restoring the truck’s original performance characteristics.

Key features that stand out:
* Issue Resolution: Specifically targets solving issues like engine misfire, hard starting, and rough idle.
* High Standards: Coils and plugs are produced under high standards with premium materials.
* Full System Refresh: Encourages replacing coils and plugs simultaneously for smoother ignition.

Pros:
– Highly specific fitment details provided for various Ford/Lincoln models.
– Excellent solution for correcting performance dips due to aged components.
– Cost-effective bundle purchase.

Cons:
– Components are generic OEM-spec replacements, lacking the premium edge of performance brands.

Best for: The practical F150 owner focused on maximum value and restoring the vehicle to baseline, smooth operation without high-cost dealer parts.

Expert Opinion: For high-mileage trucks that haven’t had their coils replaced, a kit like this is often the fastest route back to a healthy-running engine. The convenience of the bundle is hard to beat.

Set of 6 Ignition Coil Pack Iridium Spark Plug 3.5 EcoBoost V6 Compatible with Ford F150 F-150 Flex Taurus Explorer Lincoln MKS MKT 2011 2012 2013 2014 2015 2016 2017 3.5L Turbo for DG549 SP534

This final coil and plug combo emphasizes compatibility and quality with the inclusion of Iridium Spark Plugs. Unlike some budget kits that may use standard copper or platinum plugs, this set utilizes durable iridium material, which is better suited for the high-boost, high-heat environment of the EcoBoost motor. Furthermore, the detailed specifications provided (like preset gap of 0.03 in and specific thread size) help ensure you are installing the correct parts, backed by a 24-month warranty for peace of mind.

Key features that stand out:
* Material Grade: Includes Iridium material spark plugs for longevity and heat resistance.
* Warranty: Protected by a generous 24-Month Warranty.
* Detailed Specs: Provides specific technical details like 0.03-inch preset gap.

Pros:
– Assurance of high-quality iridium material plugs.
– Strong warranty backing the components.
– Excellent reference numbers for easy cross-compatibility checking.

Cons:
– Preset gap may still need slight verification/adjustment depending on engine modifications.

Best for: Buyers who want the protection of a robust warranty combined with the proven durability of iridium spark plugs in a convenient coil-and-plug kit.

Expert Opinion: The use of iridium in this kit makes it a notable step up from basic economy bundles. The 0.03-inch gap listed is right in the sweet spot for many stock and lightly tuned 3.5 EcoBoost applications.

Comparison and Buying Insights

Choosing the Best Spark Plugs For 3.5 Ecoboost F150 depends heavily on your truck’s usage and whether it is modified.

For the vast majority of stock or lightly modified trucks, we found that NGK Iridium IX provides reliability and longevity without breaking the bank. NGK consistently handles the high heat and pressure generated by the twin turbos extremely well.

If your truck has passed the 100,000-mile mark and you’re experiencing misfires, you should seriously consider replacing the coil packs along with the plugs. Kits like the AULINK, Yoshi Motors, and the two generic Ignition Coil Pack sets offer tremendous value by providing a full ignition system overhaul. The Yoshi Motors kit stands out because it specifically bundles highly reputable NGK Iridium plugs with new coils.

Ford Racing (Cold Plugs) are a highly specialized necessity. If you are running an aftermarket tune that increases boost pressure, you must use a colder plug to prevent damaging detonation. Do not use these plugs on a stock engine unless specifically recommended by your tuner.

Finally, while many plugs come pre-gapped, EcoBoost engines are incredibly sensitive to spark plug gap settings, especially under boost. We found that the optimal gap setting for a stock 3.5L EcoBoost is generally between 0.028 and 0.030 inches. Always verify the gap yourself, even on new plugs, for optimal engine performance.

Final Verdict: Which Plug Powers Your Truck?

The 3.5L EcoBoost F150 demands the best to deliver its incredible power, so selecting the right ignition components is key.

For the Best Overall Performance and Quality:
The NGK Iridium IX Spark Plugs are the clear winner. They offer a superior blend of performance, reliability, and brand reputation that is hard to beat for stock or mildly tuned trucks.

For the Best Value System Overhaul:
If your coils are aged, the Yoshi Motors DG549 UF646 Ignition Coil Packs & NGK Iridium Spark Plugs kit provides the ideal balance: new coils and high-quality NGK plugs in one package, eliminating guesswork and maximizing cost efficiency.

For Modified and Tuned Trucks:
There’s no debate here—the Ford Racing (M-12405-35T) Cold Spark Plug Set is the mandatory upgrade necessary to safely run increased boost pressure and aggressive custom tuning.

Best Spark Plugs For 3.5 Ecoboost F150: Frequently Asked Questions

What spark plug gap is recommended for a stock 3.5L EcoBoost F150?

For a completely stock 3.5L EcoBoost (non-tuned), the general consensus and OEM specification is a gap of 0.030 inches (0.76mm). However, many owners find that tightening the gap slightly to 0.028 inches helps eliminate minor misfires under heavy load, especially in high-mileage or high-boost applications.

How often should I replace the spark plugs in my 3.5 EcoBoost?

Ford’s official maintenance schedule often suggests replacing the spark plugs at 60,000 to 100,000 miles. However, because the 3.5L is a twin-turbo direct-injection engine, we strongly recommend changing the spark plugs every 30,000 to 40,000 miles. This shorter maintenance schedule prevents performance degradation, particularly rough idling or misfiring under boost.

Do I need cold spark plugs if I run a performance tune?

Yes. If your performance tune significantly increases the turbo boost pressure (often called “Stage 1” or “Stage 2” tuning), you must switch to a colder spark plug (like the Ford Racing set). Colder plugs dissipate heat faster, reducing the chance of pre-ignition and potentially catastrophic engine damage under high boost.

Should I replace my ignition coils when I replace the spark plugs?

It is highly recommended to replace your ignition coils, especially if your truck has over 80,000 miles or if you are experiencing misfires. Coil packs degrade over time due to heat cycling, and replacing them at the same time as the plugs ensures you have a completely refreshed and reliable ignition system.

Are Iridium or Platinum plugs better for the 3.5L EcoBoost?

Iridium spark plugs are generally superior for the 3.5L EcoBoost engine. Iridium offers a smaller, more focused electrode tip and is significantly harder and more durable than platinum, providing better resistance to the extreme heat and stress of a high-boost engine, leading to longer life and more consistent spark delivery.

What are common signs that my 3.5L EcoBoost spark plugs need replacing?

The most common symptoms include engine misfire, especially when accelerating hard or under boost; poor fuel economy; a rough, inconsistent engine idle; and overall loss of power. If your check engine light is flashing under heavy acceleration, it is often a turbo misfire caused by worn spark plugs or a failing coil pack.