Best Spark Plugs For 2011 F150 3.5 Ecoboost

If you own a 2011 F150 with the 3.5 Ecoboost, you know how crucial high-quality spark plugs are for maintaining power and preventing misfires, especially when the turbos spool up. I recently went through the headache of finding reliable replacements, and the difference a good set of plugs makes to engine performance and fuel economy is night and day. We’ve compared the top iridium spark plugs and coil kits specifically tailored for your first-generation 3.5L V6 Ecoboost engine to help you get that truck running smoothly again.

IMAGE	PRODUCT NAME	AMAZON LINK
	6 pc NGK Iridium IX Spark Plugs compatible with Ford…	View on Amazon
	AULINK Set of 6 UF646 Ignition Coil Pack & SP534…	View on Amazon
	Yoshi Motors DG549 UF646 Ignition Coil Packs & NGK…	View on Amazon
	Ignition Coils UF646 and Iridium Spark Plug SP534…	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
	6 pc Champion Iridium Spark Plugs compatible with Ford…	View on Amazon
	Iridium Spark Plugs 6 Pack 94374 LTR6IX Fit for 2011-2020…	View on Amazon
	MCK 6pcs Ignition Coil Pack And Motorcraft Iridium Spark…	View on Amazon
	HENGCOOL Set of 6 Ignition Coil Packs & Spark Plugs…	View on Amazon

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

These NGK Iridium IX plugs are a favorite among Ecoboost owners who value high-performance reliability. Designed to handle the extreme heat and pressure of a turbocharged engine, they feature a fine wire center electrode for excellent ignitability and a stable spark. This means you get quicker starts and consistent power delivery, which is exactly what the 3.5L needs under load.

Key features that stand out:
– Genuine NGK Parts: Trusted quality standard in performance ignition.
– Iridium Construction: Offers superior durability and a longer lifespan compared to standard plugs.
– Improved Performance: Fine wire electrode minimizes quenching, leading to a focused flame kernel.

Pros:
– Exceptional heat resistance required for Ecoboost engines.
– Proven performance gains, especially in responsiveness.
– Longer service life than traditional copper or platinum plugs.

Cons:
– Often require gapping adjustments for modified or tuned trucks.

Best for: Owners prioritizing individual plug quality and performance.

Expert Opinion: NGK Iridium plugs are widely considered the benchmark for turbocharged engines. Their design effectively resists premature wear caused by high boost pressures, offering a reliable choice for daily driving and light towing.

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

For those dealing with random misfires or an aging ignition system (common on 2011 models), replacing both the coils and plugs at once is the smart move. This AULINK kit bundles six UF646 coils and SP534 spark plugs, giving you a full refresh. The components are built to meet or exceed OEM specifications, aiming for a reliable, factory-level restoration of performance.

Key features that stand out:
– Complete Kit: Includes six coils and six plugs, simplifying the replacement process.
– OEM Part Numbers: Coils match essential Ford reference numbers (UF646, DG549).
– Quality Control: Manufactured in TS16949 certified facilities, ensuring strict quality testing.

Pros:
– Cost-effective solution for a full ignition system overhaul.
– Reduces the chance of future coil-related misfires.
– 1-Year/50,000 km warranty provides peace of mind.

Cons:
– The spark plug quality may not match high-end standalone NGK or Champion plugs.

Best for: High-mileage trucks needing a complete, budget-friendly ignition system refresh.

Expert Opinion: When an Ecoboost starts misfiring, it’s often hard to tell if it’s the coil or the plug. This combo kit removes the guesswork. While not the highest performance option, it’s a fantastic value solution for restoring stock drivability.

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

Yoshi Motors offers a compelling hybrid option: aftermarket coils paired with genuine NGK Iridium spark plugs. This combination targets one of the core issues with combo kits—using cheap plugs. By incorporating NGK Iridium plugs, you get the benefit of a full system replacement with the reliability of a top-tier plug, ensuring excellent resistance to heat and superior combustion.

Key features that stand out:
– Premium Plug Pairing: Includes highly regarded NGK Iridium Spark Plugs.
– High-Quality Materials: Coils are designed with high electrical resistance and tolerance against high heat temperatures.
– Easy Restoration: Designed to quickly restore performance and drivability, avoiding damage caused by aging coils.

Pros:
– Combines the best of both worlds: new coils and high-quality plugs.
– Excellent defense against heat-induced failure.
– A great option for preventive maintenance on critical ignition components.

Cons:
– Coils are not OEM Ford parts, so longevity might vary.

Best for: The discerning owner who wants the convenience of a kit but demands NGK plug quality.

Expert Opinion: This set is a step up from typical all-in-one kits because it wisely selects premium plugs. The Ecoboost engine is brutal on ignition parts; the NGK Iridium plugs are well-suited to handle the conditions the replacement coils deliver.

Ignition Coils UF646 and Iridium Spark Plug SP534 Replacement for 3.5L V6 Turbo 2011-2017 with Ford F150 Ecoboost Expedition Explorer Flex Taurus Transit, withLincoln MKS MKT Navigator – Set of 6

This kit from TAUXMZ focuses on OE-level durability using high-grade materials for both the coil and the plug. The coil packs utilize silicon steel and imported epoxy resin for resistance against cracking and short circuits, while the included Iridium SP534 plugs ensure fast starts and rapid acceleration. They emphasize rigorous testing, claiming the parts work great for more than 15,000 miles.

Key features that stand out:
– Premium Coil Materials: Constructed with silicon steel and Japan-imported epoxy resin for high-pressure durability.
– Iridium Electrode Plugs: Ensures quick starting and consistent acceleration.
– OE Level Durability: Direct replacement designed to avoid misfires after extensive testing.

Pros:
– Focuses heavily on the longevity and resilience of the coil pack construction.
– Direct replacement fitment for easy installation.
– Addresses common Ecoboost issues like rough idling and decreased power.

Cons:
– The 15,000-mile benchmark is significantly lower than the recommended plug change interval.

Best for: Drivers looking for an affordable replacement set where robust coil construction is a priority.

Expert Opinion: In turbocharged applications, coil failure is often just as likely as plug failure. TAUXMZ’s attention to detail regarding coil materials is reassuring for those replacing failed stock units.

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 NPAUTO coil and plug combo is positioned as a comprehensive solution for solving typical ignition system failures, such as engine misfire and poor fuel economy. The kit stresses the importance of replacing both components simultaneously, as worn-out spark plugs can strain and eventually cause the coil packs to fail. It promises to meet or exceed OEM specifications using premium materials.

Key features that stand out:
– Comprehensive Troubleshooting: Designed to solve common issues like hard starting and rough idle.
– OEM Specification Compliance: Components are manufactured to meet or exceed original equipment standards.
– Coil/Plug Synergy: Recommended to replace both for a better and smoother ignition system.

Pros:
– Excellent value for replacing the entire ignition system.
– Components are designed for compatibility and easy install.
– Clearly lists many common OEM interchange numbers.

Cons:
– Lack of specific branded plug (like NGK or Champion) makes quality difficult to ascertain beforehand.

Best for: The owner seeking a reliable, matched set to fix current misfire issues without breaking the bank.

Expert Opinion: When dealing with multiple misfire codes on an older Ecoboost, a matched set like this is often the most sensible first step. The overall consistency of the set usually outweighs the slight performance edge of a single branded plug.

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 kit emphasizes clear specifications for both the coil and the iridium spark plug, including detailed measurements (Hex Size: 0.63 in, Preset Gap: 0.03 in). The detailed specs help ensure proper installation and compatibility. Like many combos, it offers an Iridium plug to maximize heat resistance and longevity, making it suitable for the 3.5L turbo application.

Key features that stand out:
– Detailed Specifications: Provides precise measurements for fitment and plug specs.
– 24-Month Warranty: A robust warranty offering, indicating confidence in the product quality.
– Iridium Plug Material: Designed to handle the harsh, high-pressure environment of the Ecoboost.

Pros:
– The 24-month warranty is one of the longest offered for these components.
– Specific plug gap information is helpful for confirmation (though manual checks are still recommended).
– Full replacement ensures a clean slate for the ignition system.

Cons:
– The detailed specs confirm a gap of 0.03 inches, which is often too large for heavily tuned Ecoboosts.

Best for: Buyers who value an extended warranty and stock-level ignition reliability.

Expert Opinion: The transparency in specifications is a big plus. While the listed 0.03 in gap is a good starting point, remember that optimal performance for the 3.5L Ecoboost often requires careful gapping (usually between 0.025 in and 0.028 in) depending on your boost level.

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

Champion is a name steeped in racing history, and their Iridium spark plugs bring that heritage of high performance to your F-150. These plugs are engineered with a fine-wire center electrode and V-trimmed ground electrode to create a sharply-focused flame kernel, which translates directly into faster combustion and minimal misfires under boost. They are built to withstand the tough demands of modern turbo engines.

Key features that stand out:
– Trusted Racing Heritage: Champion brand recognition and history in high-performance parts.
– Enhanced Combustion: Fine-wire electrode design minimizes quenching for quicker, powerful combustion.
– Durable Precious Metals: Built with Iridium to improve performance without the wear and tear of standard plugs.

Pros:
– Excellent performance characteristics for maximizing horsepower.
– Extremely resistant to fouling and misfires in high-pressure environments.
– High-quality OE-style replacement.

Cons:
– Sold only as plugs, requiring separate purchase of coils if needed.

Best for: Performance enthusiasts and owners seeking an alternative to NGK/Motorcraft while maintaining high quality.

Expert Opinion: Champion Iridium plugs are highly competitive with NGK. They are designed to improve ignition consistency, which is particularly beneficial in the 3.5L Ecoboost where maximizing ignition energy is key to preventing detonation under high load.

Iridium Spark Plugs 6 Pack 94374 LTR6IX Fit for 2011-2020 Ford F150 3.5 V6 Expedition Explorer Flex Taurus Transit-150 250 & Lincoln MKS MKT Navigator 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

This pack of Iridium spark plugs from A-NAFTULY is focused purely on the plug replacement, covering a wide range of model years for the 3.5L V6 Ecoboost. These plugs aim to address common ignition system issues like backfiring, stalling, and poor idling by ensuring stable and reliable high-voltage output across the engine’s speed range.

Key features that stand out:
– Wide Compatibility: Fits F-150 3.5L V6 models across a decade (2011-2020).
– Quality Control Focus: Undergoes rigorous testing to improve overall performance.
– 12-Month Warranty: Provides a decent period of coverage for the product.

Pros:
– Affordable replacement option for plug-only maintenance.
– Addresses general symptoms of a worn ignition system.
– Designed for engine stability and reliability.

Cons:
– Brand recognition is low compared to NGK or Champion.

Best for: Routine maintenance replacement where the coil packs are known to be in good condition.

Expert Opinion: When choosing unbranded Iridium plugs, the focus should always be on the gap. Ensure these are carefully checked and adjusted to the required specification (usually 0.028 in) before installation on the 3.5 Ecoboost to prevent misfires.

MCK 6pcs Ignition Coil Pack And Motorcraft Iridium Spark Plug Compatible With Ford Lincoln Expedition F-150 F150 Flex Police Interceptor Transit 2011-2017 11-17 3.5L 3.5 V6

This MCK kit is unique because it combines aftermarket coil packs with genuine Motorcraft Iridium Spark Plugs (SP534). Motorcraft is Ford’s official parts brand, so this combination offers the best assurance of plug compatibility and performance characteristics that mimic factory standards. The result is exceptional acceleration and fuel-efficiency, restoring the factory ‘new’ feel to your truck.

Key features that stand out:
– Motorcraft Plugs Included: Uses genuine Ford/Motorcraft Iridium plugs (OE quality).
– Effortless Installation: Designed for a seamless direct replacement fit.
– Improved Durability: Coils offer excellent heat resistance and corrosion protection.

Pros:
– Guaranteed plug quality equivalent to original equipment.
– Excellent for those seeking OE performance levels without the full cost of OE coils.
– Promises consistent, smooth engine starts right away.

Cons:
– The coil pack is aftermarket, not official Motorcraft.

Best for: The discerning owner who demands OEM plug performance but wants to save money on the coil packs.

Expert Opinion: If you have to choose one component to be OEM-spec, it should be the plug, especially in the 3.5L Ecoboost. Since this kit includes genuine Motorcraft plugs, it offers one of the most reliable performance profiles among the combo kits.

HENGCOOL Set of 6 Ignition Coil Packs & Spark Plugs Kit UF646 Compatible with Ford & Lincoln V6 3.5L Ecoboost 2011-2016 F-150, Flex, Expedition, Explorer, Taurus, Transit 150 BL3Z-12029-C DG549

HENGCOOL provides a strong, well-specified combo kit emphasizing quality control through rigorous testing (thermal shock, humidity, vibration). Their focus is on delivering optimal performance and reliability that meets or exceeds OE standards. A major benefit highlighted is the ease of installation and the promise of lower fuel consumption and reduced emissions thanks to fast ignition.

Key features that stand out:
– Rigorous Testing: Subjected to thermal shock and vibration testing.
– Environmental Benefits: Designed to help lower fuel consumption and reduce emissions.
– Detailed Specifications: Includes specs for the coil connector (3 pins) and the plug (Preset Gap: 0.032 In).

Pros:
– Strong focus on long-term reliability through testing.
– A good all-in-one package to solve ignition performance issues.
– Clear technical specifications provided.

Cons:
– The stated plug gap of 0.032 in is likely too wide for a stock 2011 F150 3.5L Ecoboost.

Best for: Buyers who prioritize a highly tested and validated replacement system kit.

Expert Opinion: The materials and testing procedures sound promising. However, like many combo kits, the plug gap is likely wide for the high boost pressures of the 3.5L Ecoboost. Always manually measure and reduce the gap to 0.028 in or less for optimal results.

Comparison Short Insights

When evaluating spark plugs for your 2011 F150 3.5 Ecoboost, there are two primary considerations: material quality and whether you need to replace your coils.

For plug quality alone, the 6 pc NGK Iridium IX Spark Plugs and the 6 pc Champion Iridium Spark Plugs stand out. Both offer maximum heat resistance and the fine-wire electrodes necessary to combat misfires common under heavy turbo boost. They are the best choice for trucks where only the spark plugs are being replaced.

For older trucks (especially those over 100,000 miles), replacing the coils is highly recommended. Combination kits offer the best value and convenience. Be mindful of the quality of the spark plug included. Kits like the Yoshi Motors and MCK sets wisely pair aftermarket coils with premium, branded plugs (NGK or Motorcraft, respectively). This is often the smartest investment for performance and longevity.

A critical note for the 3.5L Ecoboost: Nearly all performance experts agree that the factory-specified gap (often around 0.030 in to 0.032 in) is too wide. Regardless of which plug you buy, ensure you manually check and regap the spark plugs to around 0.026 in to 0.028 in for superior performance, especially if you plan on towing or running a tune.

Final Verdict

Choosing the right spark plug for your 2011 F150 3.5 Ecoboost depends on your vehicle’s mileage and your budget.

The No-Compromise Performance Pick:
If your coil packs are new or low-mileage and you just need the best plug available, choose the 6 pc NGK Iridium IX Spark Plugs compatible with Ford F-150 3.5L V6 2011-2019. NGK is the most consistently recommended plug for reliable high-boost performance.

The Best Value Ignition System Overhaul:
If your 2011 F150 is showing signs of coil failure or has high mileage, the MCK 6pcs Ignition Coil Pack And Motorcraft Iridium Spark Plug set offers the most balanced approach. You get the peace of mind of genuine Motorcraft Iridium plugs combined with affordable replacement coils.

The Best Budget Combo Kit:
For a straightforward, cost-effective fix to misfires, the AULINK Set of 6 UF646 Ignition Coil Pack & SP534 Spark Plug is a solid option, offering a full system replacement with a good warranty, perfect for returning a struggling engine to stock reliability.

FAQ on Best Spark Plugs For 2011 F150 3.5 Ecoboost

What is the ideal spark plug gap for a 2011 F150 3.5L Ecoboost?

The factory specification is typically around 0.030 in to 0.032 in. However, due to the high cylinder pressures from the turbos, most mechanics and tuners recommend gapping iridium spark plugs down to 0.026 in to 0.028 in. A tighter gap reduces the chance of spark blow-out under high boost, preventing misfires and ensuring a smoother running engine.

How often should I replace the spark plugs on my 3.5 Ecoboost?

While Ford recommends longer intervals (up to 100,000 miles for platinum/iridium plugs), the 3.5L Ecoboost service interval should be shorter due to the nature of direct injection and turbocharging. For optimal performance and to prevent engine misfires, it is widely recommended to replace the plugs every 30,000 to 50,000 miles.

Should I replace my coil packs along with the spark plugs?

If your 2011 F150 has over 80,000 to 100,000 miles, it is highly advisable to replace the ignition coil packs at the same time. Worn plugs place extra strain on the coils, and failure often occurs around this mileage. Replacing them together is preventative maintenance and ensures superior ignition system reliability.

What kind of spark plug material is best for the turbo V6?

Iridium spark plugs are the undisputed best choice for the 3.5L Ecoboost. Iridium offers superior resistance to the extreme heat and pressure generated by the turbochargers, providing a long lifespan and stable performance, crucial for preventing engine damage.

What are the symptoms of bad spark plugs in my 2011 F150?

Common symptoms of failing Ecoboost spark plugs include rough idling, reduced acceleration or power loss, poor fuel economy, engine hesitation under acceleration (especially under boost), and the check engine light flashing (indicating a misfire).

Will new spark plugs help if I have a performance tune?

Absolutely. If your 3.5L Ecoboost has a performance tuning upgrade (increased boost), high-quality, properly gapped iridium plugs are mandatory. Running high boost on old or wide-gapped plugs almost guarantees misfires and loss of power. Ensure the gap is set closer to 0.026 in for tuned applications.