When it comes time to change your spark plugs, knowing which ones are best for your vehicle can be difficult. If you have a Ford Flex, there are a few specific spark plugs that you should consider using.
Use only spark plugs that meet Ford’s strict material and design requirements, like Motorcraft or other equivalent replacements. If you don’t use these parts, your customer warranty may be voided if the engine becomes damaged.
Spark Plugs I Would Pick For My Ford Flex
Don’t have time to read the entire article? No problem! Here’s a quick rundown of each engine’s best replacement spark plugs – simply pick yours and get on your way.
| Product Image | Product Name / Primary Rating / Price | Primary Button |
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Best For Ford 3.5 V6 DOHC
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Best For Ford 3.5 V6 Duratec
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Best For 3.5 Turbo EcoBoost
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Best For 3.5 Twin-Turbo EcoBoost
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What Spark Plugs Does Ford Flex Use
In this table, I have collected information on all engines of all generations of the Ford Flex. Ford recommends using Motorcraft parts, as this is their official manufacturing division. This means that they are 100% suitable for all the requirements of your car.
| Engine | Spark Plug | Spark Plugs Gap |
|---|---|---|
| 2009-2012 3.5L DOHC V6 | Motorcraft SP-411 | 0.052–0.056 inch (1.32–1.42 mm) |
| 2010-2012 3.5L V6 EcoBoost | Motorcraft SP-512 | 0.033–0.037 inch (.838– .939 mm) |
| 2013-2019 3.5L V6 Duratec | Motorcraft SP-520 | 0.049-0.053 inch (1.25-1.35 mm) |
| 2013-2014 3.5L V6 EcoBoost | Motorcraft SP-528 | 0.031–0.038 inch (.81– .97 mm) |
| 2015-2019 3.5L V6 EcoBoost | Motorcraft SP-534 | 0.0295–0.0335 inch (.75– .85 mm) |
Source: Ford Flex Owners Manual
Notice
Use only spark plugs that meet Ford’s strict material and design requirements, like Motorcraft or other equivalent replacements. If you don’t use these parts, your customer warranty may be voided if the engine becomes damaged.
Understanding the Importance of Spark Plugs in Ford Flex
Every car enthusiast understands the critical importance of a finely tuned machine, especially in the American classic, the Ford Flex. Spark plugs, sometimes overlooked, are not just some insignificant component; they are the beating heart of any engine, integral to its performance. But just what is the significance of the right spark plug in a Ford Flex, and why should any self-respecting aficionado care?
Let’s first delve into the purpose these electrical dynamos fulfill. Spark plugs produce an electric spark, igniting the compressed fuel-air mixture within the engine, creating the combustion that powers the vehicle forward. It’s no exaggeration to say the right spark plug is essential for your Ford Flex to fire on all cylinders.
One of the most talked-about spark plug benefits is fuel efficiency. The right spark plug in a Ford Flex will maximize this efficiency, giving you more miles per gallon – a factor of clear importance to every future-forward, tech-savvy driver.
However, Performance is more than fuel economy; horsepower and torque also matter. A high-quality, precision-fit spark plug ensures optimal combustion, maximizing your Flex’s power. Who could argue against extra horsepower and torque? Especially when it leads to a smoother driving experience and greater acceleration – clear wins for any tech-oriented gearhead.
But that’s not all. Let’s factor longevity into the equation. The Ford Flex engine will run smoother and cooler with the right spark plug. It reduces strain on the engine, leading to fewer repairs in the long run – saving time, money, and, most importantly, unnecessary stress.
Now, when it comes to selecting the right spark plug for your Ford Flex, there’s no one-size-fits-all answer. The best spark plug can change depending on model year or specific engine requirements. However, a popular choice among Ford Flex owners tends to be iridium spark plugs due to their durability and consistent performance, but do your due diligence to find the perfect fit for your vehicle.
Best Spark Plugs For Ford Flex
If you have a Ford Flex, the best spark plugs to use are Motorcraft. This is because they are designed specifically for this car and meet all of the requirements that Ford has put in place. But you can also use some equivalent replacement spark plugs, as long as they are of the same quality and design.
These spark plugs also provide excellent performance and reliability without any issues. They are also long-lasting so you won’t need to worry about changing them often.
2009-2012 Ford 3.5 Spark Plugs
- Spark plug gap: 0.050" (1.30 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Platinum;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L DOHC engine.
- Spark plug gap: 0.050" (1.30 mm);
- Change interval: 90,000 miles;
- Longevity: 90,000 miles;
- Ground electrode: Platinum;
- Center electrode: Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L DOHC engine.
- Longevity
- Price
- Spark plug gap: 0.055" (1.40 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Platinum;
- Center electrode: Iridium-Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L DOHC engine.
2010-2014 Ford 3.5 EcoBoost Spark Plugs
- Spark plug gap: 0.031" (0.80 mm);
- Change interval: 100,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Iridium;
- Center electrode: Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Spark plug gap: 0.030" (.75 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Iridium;
- Center electrode: Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Price
- Longevity
- Spark plug gap: 0.031" (.80 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Iridium;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Reliability
- Satisfaction Guarantee
- Pre-gapped spark plugs
2013-2019 Ford 3.5L Duratec Spark Plugs
- Spark plug gap: 0.050" (1.30 mm);
- Change interval: 80,000 miles;
- Longevity: 90,000 miles;
- Ground electrode: Platinum;
- Center electrode: Nickel;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L Duratec engine.
- Spark plug gap: 0.050" (1.30 mm);
- Change interval: 80,000 miles;
- Longevity: 90,000 miles;
- Ground electrode: Platinum;
- Center electrode: Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L Duratec engine.
The NGK 94806 LTR6BP13 Laser Platinum Spark Plug is a dependable and efficient addition to any engine. This spark plug guarantees improved performance for your car, truck by providing high ignitability and longer service life.
With laser-welded dual platinum surfaces ensuring a slow wear rate and superior anti-fouling performances, you’re certain to see improved fuel efficiency and lowered emissions. For maximum protection against corrosion, the trivalent metal plating prevents rust and damage, while corrugated ribs prevent flashover.
A pure alumina silicate ceramic insulator offers superior strength and better heat transfer capabilities. Inside the spark plug is a copper core that aids in heat removal, which prevents costly leakage throughout the combustion process when combined with triple seals.
- Spark plug gap: 0.050" (1.30 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Platinum;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L Duratec engine.
- Spark plug gap: 0.043" (1.10 mm);
- Change interval: 50,000 miles;
- Longevity: 50,000 miles;
- Ground electrode: Iridium;
- Center electrode: Nickel;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L Duratec engine.
- Reliability
- Need to change the gap
- Longevity
2015-2019 Ford 3.5L Twin-Turbo EcoBoost Spark Plugs
- Spark plug gap: 0.031" (0.80 mm);
- Change interval: 100,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Iridium;
- Center electrode: Platinum;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Spark plug gap: 0.031" (.80 mm);
- Change interval: 80,000 miles;
- Longevity: 90,000 miles;
- Ground electrode: Nickel;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L Twin-Turbo EcoBoost engine.
- Spark plug gap: 0.031" (0.80 mm);
- Change interval: 50,000 miles;
- Longevity: 50,000 miles;
- Ground electrode: Nickel;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Longevity
- Price
- Reliability
- Spark plug gap: 0.031" (0.80 mm);
- Change interval: 80,000 miles;
- Longevity: 60,000-120,000 miles;
- Ground electrode: Platinum;
- Center electrode: Ruthenium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Spark plug gap: 0.031" (.80 mm);
- Change interval: 90,000 miles;
- Longevity: 100,000 miles;
- Ground electrode: Iridium;
- Center electrode: Iridium;
- Hex Size: 5/8" (16mm);
- Fitment: Ford 3.5L EcoBoost engine.
- Reliability
- Satisfaction Guarantee
- Pre-gapped spark plugs
Top Brands of Spark Plugs for Ford Flex
Inspecting top-rated spark plug brands compatible with a Ford Flex yields intriguing results. Clearly, manufacturers have gone to great lengths to meet and exceed this mid-size SUV’s specific demands and requirements. Three of these leading brands consistently produce spark plugs that outshine others in terms of compatibility and performance: Bosch, NGK, and Denso.
Bosch spark plugs often top the charts in auto part reviews. ’ll This remarkable brand offers an impressive range of products designed for a broad spectrum of vehicle makes and models, including the Ford Flex. Bosch plugs, known for their durability, effectively provide consistent, efficient ignition, thus satisfying two critical requirements for Ford Flex owners. The Bosch Platinum Ir Fusion, an exemplar in this category, boasts fused platinum and iridium center electrodes, offering extended longevity, superior performance, and excellent wear resistance.
NGK, a prestigious brand hailing from Japan, excels in creating high-quality spark plugs compatible with numerous vehicles, including the Ford Flex. NGK’s iridium lineup, particularly the IX Iridium series, delivers a commendable performance.
These spark plugs feature an iridium alloy center electrode that’s laser welded and fine wire ground, offering unbeatable durability, superior heat resistance, and excellent ignitability. They are renowned for their efficient combustion, which leads to improved fuel economy, smoother acceleration, and decreased emissions.
Another reliable industry player is Denso. Known for their first-rate production standards and innovative solutions, Denso proves its mettle in the spark plug arena. Their spark plugs, specifically the Iridium TT series, possess a twin-tip technology that promotes quicker combustion, augmented power, and faster acceleration. These elements provide a significant edge for Ford Flex owners seeking a seamless driving experience.
However, choosing spark plugs based purely on brand recognition may not always yield satisfactory results, as one’s exact Ford Flex specifications, such as engine type and model year, impact spark plug compatibility. Remember to match these factors while analyzing various spark plug options. Furthermore, pairing the right spark plug brand with regular maintenance and proper installation procedures can dramatically improve engine performance, fuel efficiency, and overall vehicle lifespan.
Deciding which spark plug brand best suits a Ford Flex is, ultimately, a form of investment. Ensuring that these plugs perform optimally and are compatible will help foster the long-term health and performance of any Ford Flex. Armed with this information, scrutinizing various spark plug brands becomes significantly simpler and more rational, streamlining one’s decision-making process in achieving optimal vehicle performance and maintenance.
Does It Matter What Brand Spark Plug I Use?
It does matter what brand you use when it comes to spark plugs. You should always choose reliable brands made for your particular car model and engine type not to void any warranties or damage your engine. Motorcraft is the best choice for Ford Flex since they meet all the requirements. But some other alternatives may work just as well if you don’t have access to Motorcraft parts.
I suggest using Platinum and Iridium spark plugs from NGK if you’re looking for the best fuel economy. These plugs combine platinum electrodes with an iridium alloy center electrode to improve corrosion resistance and longevity. They also provide better cold starting capability and reduced emissions when compared to traditional copper spark plugs.
How Often Should Ford Spark Plugs Be Changed?
Your Ford Flex spark plugs should be replaced every 80,000 miles. This is just a guideline – if you notice any issues with your car’s performance or fuel economy, it might be best to change them sooner.
Read Also: How to Gap Spark Plugs for Optimal Performance
What Are Signs That Your Car Needs New Spark Plugs?
If you notice any of the following symptoms, it could be time to change your spark plugs:
- Decreased engine performance or acceleration
- Poor fuel economy
- Engine misfiring
- Rough idling
These are all signs that your spark plugs may need to be changed. It’s best to get them replaced as soon as possible so you can restore proper engine performance.
The Science Behind Spark Plug Materials
Different materials can drastically alter the performance of spark plugs in a Ford Flex. Reviewing this aspect can make a tangible difference in terms of fuel economy, power delivery, and overall engine health. There are as many types of spark plugs as there are materials used to construct them, all exhibiting unique properties that can optimize or hinder a vehicle’s performance. When we discuss spark plugs, three principal materials come into focus: Copper, Platinum, and Iridium.
Copper is considered the standard. Copper spark plugs have a solid copper core, but the center electrode’s business end is a 2.5mm-diameter nickel alloy. This is the largest diameter electrode of all the spark plug types. The large diameter and lack of precious metals means they have the shortest lifespan. However, they’re an excellent choice for high-performance, high-compression vehicles. In a Ford Flex, they might not achieve their full potential.
Platinum spark plugs, on the other hand, operate at a lower temperature than copper. The platinum construction allows the plug to fire more efficiently, which improves the Ford Flex’s overall fuel efficiency and performance. They last longer and offer marginally better performance and improved resistance to erosion. Though more expensive than copper plugs, their added benefits in a Ford Flex are worthy of consideration.
Iridium is top-notch in terms of spark plug materials. Iridium spark plugs offer the best longevity with a higher melting point and stronger material consistency. Additionally, they have an ultra-fine wire design and laser-welded technology for optimal operation in all facets. Generally, iridium plugs will step up the engine’s performance, enhance cold starting, and provide smoother idling to the Ford Flex. Iridium plugs, however, come at a premium cost that can only be justified by their superior performance and longevity.
There is some debate over the necessity of using high-end plugs in a vehicle like a Ford Flex, though mainly about whether the cost of iridium spark plugs translates into a significant performance enhancement compared to less expensive materials like copper and platinum.
Although each material has pros and cons, the choice largely depends on the drivers’ specific needs and Ford Flex’s model year and engine requirements. However, always remember that quality and compatibility matter most when it comes to spark plugs.
Regardless of the material chosen, regular maintenance and timely replacements ensure that the spark plugs function at their peak, thus keeping the Ford Flex running smoothly and efficiently. Improperly functioning spark plugs could result in significant engine damage over time, not to mention a notable drop in performance and overall fuel efficiency.
Installation Guide for Ford Flex Spark Plugs
Having fully dived into the world of spark plugs for the Ford Flex, now comes the most critical part – the actual technical process of properly installing spark plugs in this particular model. While it may sound daunting, it’s a fairly straightforward process that can be achieved following the right steps, a helpful guide for any tech-savvy engine enthusiast.
Before getting hands-on, any safety precautions should be adhered to. This includes disconnecting the battery, wearing protective gear like gloves and eyewear, and ensuring the engine is cool to avoid burns.
With safety measures in place, it’s time to delve into the engine. Begin by locating the spark plugs; they are generally positioned on top of the engine cylinders, hidden beneath the spark plug wires. Remove these wires – doing so one at a time avoids confusion and errors in reinstallation.
Use a spark plug socket and ratchet to remove the existing plug. Upon removal, visually inspect the old plugs. Notice the condition and coloration, which can provide critical insight into the engine’s state. A standard brownish color indicates optimal functionality, while oil or soot deposits suggest possible engine issues needing professional attention.
Before installing the new spark plug, check the gap. Despite being pre-gapped, there’s no harm in confirming its correctness. Too large a gap can lead to spark plug failure, while too narrow a gap can diminish the engine’s performance. This is typically accomplished with a gapping tool.
With the inspection complete and the new spark plug ready, it’s time for installation. Hand-tighten the new spark plug into the cylinder using the socket, and then use a torque wrench to achieve the final tightening. Over-tightening can damage the cylinder head or spark plug. Therefore, accuracy is critical.
Properly reattach the spark plug wire onto the new plug, ensuring it clicks into place. This is a pivotal and often overlooked step – an improper connection can lead to multiple engine issues, from misfire to an inability to start.
Repeat these steps for each spark plug, one at a time, ensuring not to cross-thread or over-tighten any plugs.
Having completed this process, reconnect the battery and start the engine. A smooth idle and a responsive throttle indicate that the new spark plugs are properly installed and functioning optimally.
This process, although seemingly intricate and time-consuming, can effectively enhance the Ford Flex’s overall engine performance and longevity. Like any technical procedure, it requires accuracy, patience, and adherence to instructions.
As an early adopter of technological advancements, getting hands-on and being part of the process rather than just enjoying the results can be an exhilarating experience not just for the Ford Flex but for any potential future vehicles that join the tech-driven convoy. Adapting and advancing our knowledge of vehicle mechanics and mastering the art of spark plug installation and maintenance is all part and parcel of an ever-evolving tech enthusiast mindset.
If there’s a way to automate a process, you can count on a tech enthusiast to find it, but there’s no substitute for the satisfaction of accomplishing a hands-on task, such as properly installing spark plugs in a Ford Flex.
