How often should I change the spark plugs on my 5.0 F150?

For most 5.0-liter F-150s with modern iridium-tipped plugs, the typical replacement interval is about 100,000 miles under normal driving. If you tow heavy loads, do lots of short trips, or operate in dusty or extreme conditions, you may need to inspect sooner and plan replacements around the 60,000–90,000 mile range, depending on wear and symptoms.

Understanding the 5.0 F-150 spark plug interval

The timing of spark plug replacement on the 5.0 can vary by model year and the exact plug specification. Modern 5.0L engines in recent F-150s typically use iridium-tipped plugs designed for long life, but exact recommendations still come from Ford's service schedule for your year and trim. Always verify with the owner’s manual or a Ford dealership for your specific vehicle.

Plug type and year impact

Newer 5.0L Coyote engines commonly use iridium plugs, which support longer intervals (often around 100,000 miles) compared with older copper or platinum designs. If your truck has a replaced or aftermarket plug set, or if you’re working with a pre‑production or special edition engine, the interval may differ. Check the official maintenance schedule for your exact year and engine code.

When severe conditions shorten the interval

Harsh operating conditions—such as towing heavy trailers, sustained high load, frequent short trips, dusty environments, or extreme temperatures—can accelerate plug wear. In those scenarios, plan for earlier inspection and consider replacement in the 60,000–90,000 mile window, rather than waiting for 100,000 miles.

Recommended intervals and practical guidance

The following guidance reflects typical practice among 5.0L F-150 owners and service guides. Your best source remains Ford's official schedule for your exact vehicle year and plug type.

Typical intervals based on driving conditions and plug type:

• Normal driving: about 100,000 miles (160,000 km) with iridium-tipped plugs


• Severe service (towing, frequent short trips, dusty or hot environments): inspect around 60,000 miles and consider replacement by 90,000 miles


• If you notice misfires, rough running, or other performance issues, replace promptly rather than relying solely on mileage

Note: If your engine uses copper or platinum plugs, the interval can be shorter and more variable. Always confirm with the manual or a Ford technician for your specific setup.

Early warning signs that you should consider replacing sooner

Even with a long-life plug design, wear or fouling can occur earlier if conditions are challenging. Watch for these indicators and act before they become a bigger issue.

• Engine misfires or rough idle


• Reduced power and slower acceleration


• Decreased fuel economy


• Hard starting or extended cranking times


• Check Engine Light with misfire or related codes

In any of these cases, have the plugs inspected and replaced if needed. Worn plugs can stress the ignition system and catalytic converter over time.

What to expect during replacement (general guidance)

Replacing spark plugs on a 5.0 F-150 is within reach for a capable DIYer with the right tools. Expect to remove ignition coils, gap and check new plugs, apply proper torque to OEM specifications, and inspect coil boots for cracking or wear. If you tow frequently, drive in demanding conditions, or lack the needed tools, professional service is recommended to avoid cross-threading or damaging components. Always disconnect the battery and follow all safety precautions.

Summary

In short, the standard recommendation for many 5.0 F-150 models with iridium plugs is around 100,000 miles under normal use. Severe service and harsh operating conditions can shorten that window, making inspections around 60,000–90,000 miles prudent. Pay attention to signs of wear or misfire, and always consult your specific year’s owner manual or a Ford dealer to confirm the exact interval for your truck. Regular maintenance helps prevent misfires, protects fuel economy, and keeps your 5.0 running smoothly.

Do I really need to change my spark plugs at 100,000 miles?

Yes, replacing spark plugs at 100,000 miles is a common and often necessary maintenance task, as many modern vehicles have spark plugs rated to last that long. However, the exact interval depends on your vehicle's make, model, and the type of spark plug installed, so you should always check your owner's manual for the manufacturer's specific recommendation. 
This video explains when to change spark plugs and what happens if you don't: 1mHonest Mechanic ColoradoYouTube · Dec 24, 2023
Why it's important

• Engine performance: Spark plugs that are past their prime can cause rough idling, poor acceleration, and decreased fuel efficiency. 
• Preventing damage: Over time, worn-out plugs can put extra stress on other components, like ignition coils, and may seize in the engine block, making them harder to remove later. 
• Preventative maintenance: Replacing spark plugs is a form of preventative maintenance that can prevent more costly repairs down the line. 

This video explains why it's important to change spark plugs at 100k miles: 52sWhite One Auto, LLCYouTube · May 19, 2021
What to consider

• Owner's manual: Your vehicle's owner's manual is the most reliable source for the correct replacement interval and recommended plug type. 
• Spark plug type: The lifespan of spark plugs varies by material. Iridium plugs are often rated for 100,000 miles or more, while other types like copper or platinum have shorter lifespans. 
• Driving conditions: Severe driving conditions can shorten the life of spark plugs, so your interval may be shorter than recommended if you frequently tow, drive in extreme temperatures, or frequently start and stop. 

How much does it cost to replace spark plugs in a Ford F-150?

The cost to replace spark plugs on a Ford F-150 typically ranges from $250 to over $500, depending on the truck's age, engine, and whether you do it yourself. A professional service will cost more due to labor, with estimates often landing in the $350-$450 range, while a DIY approach can save you money on labor but requires parts cost plus your time. 
Professional service

• Typical range: Expect to pay anywhere from approximately $250 to over $500 for professional replacement. 
• Factors influencing cost: The exact price depends on the year and specific engine of your truck. Newer models or engines with more complex designs, like some V6 or V8 engines, can have higher labor costs. 
• Why it's more expensive: This includes the cost of parts and a significant amount of labor time, which can be high, especially if certain plugs are difficult to access. 
• Example: A 2016 F-150 with a 2.7L Turbo V6 might cost around $335-$470, while an older 5.0L V8 might be closer to $250-$365. 

DIY (Do-it-yourself)

• Parts cost: The price for the spark plugs themselves is relatively low, often ranging from around $32 for a set on a four-cylinder engine to about $64 for a V8, though this can vary significantly. You can find many options for as low as $10-$11 per plug. 
• Labor savings: The main benefit of a DIY job is avoiding the high labor costs associated with a professional shop. 
• Difficulty: Replacing spark plugs can be challenging on an F-150, especially if you have a more complex engine. The rear plugs can be difficult to reach, and if a plug breaks during removal, it can significantly increase the repair cost and complexity. 
• Recommendation: If you are comfortable with basic car maintenance, this can be a great way to save money. If you are not experienced, it may be safer to pay a professional. 

What year do Ford's have the spark plug problem?

If you are the owner of a Ford truck with a three-valve (3V) modular V-8 or V-10 engine built from 2004 thru 2007, you have either faced the misery of broken spark plugs-or you will.

Which F-150 years are worth avoiding?

2004-2008
We recommend avoiding 2004-2008 F150 models due to spark plug ejection issues with the 5.4L V8 engine. The 2015-2016 models, while not bad, had some early aluminum body production quirks that Ford resolved in later years. Always research specific model years and have any used truck inspected before purchase.