Ford Police Interceptor Utility Spark Plug Replacement Guide (2013-2024)
Keep your Interceptor's engine firing on all cylinders with the right set of spark plugs.
- For EcoBoost engines, use only high-quality Iridium or Ruthenium spark plugs from brands like NGK or Motorcraft and consider changing them every 40,000-60,000 miles.
- The most difficult part of the job is replacing the three rear spark plugs, which requires removing the intake manifold.
- Always verify the spark plug gap before installation, even if the manufacturer claims they are pre-gapped.
- No recalls exist for spark plugs, but a major engine recall for 2020-2022 3.3L models highlights the high-stress nature of these engines.
Signs of Failing Spark Plugs in Your Interceptor
Because of the high-stress nature of police use, spark plugs in these vehicles can wear out sooner than in a civilian Explorer. When spark plugs start to fail, your vehicle will give you clear warning signs. Ignoring them can lead to poor performance and potentially expensive engine damage. Look out for these symptoms:
- Rough Idling: The engine may shake or sputter when the vehicle is stopped.
- Hesitation During Acceleration: You might notice a delay or stumble when you press the gas pedal.
- Reduced Power: The vehicle feels sluggish and doesn't accelerate as quickly as it used to.
- Poor Fuel Economy: You'll find yourself filling up the tank more often because worn plugs can't burn fuel efficiently.
- Check Engine Light: A failing spark plug is a common reason for the check engine light to come on, often with misfire codes like P0300, P0301, P0302, etc. 🎬 See how to diagnose and fix a specific cylinder misfire.
- Difficulty Starting: The engine may crank for longer than usual before it starts, especially when cold.
Known Issues: 2020-2022 3.3L Engine Recall
Ford issued a recall (NHTSA ID: 24V598) for approximately 85,000 2020-2022 Police Interceptor Utility vehicles with 3.3L gas and hybrid engines due to risk of premature engine failure. While not directly a spark plug issue, the recall notes that the extreme conditions of police use contribute to engine stress. This underscores the importance of using high-quality maintenance parts, including spark plugs, to ensure engine health.
Choosing the Right Aftermarket Spark Plugs
When it comes to spark plugs, "aftermarket" doesn't mean lower quality. Many aftermarket brands like NGK and Denso are the original equipment (OEM) suppliers for Ford. The key is to choose the right material and brand for your specific engine.
OEM vs. Aftermarket
For the Police Interceptor Utility, especially the turbocharged 3.5L EcoBoost models, it is critical to use high-quality plugs that meet or exceed Ford's specifications. Budget-brand plugs may not withstand the high cylinder pressures and temperatures of these engines, leading to premature failure and misfires. Brands like Motorcraft (Ford's own brand), NGK, and Denso are trusted choices. Autolite and Bosch also offer reliable options that are often more affordable.
Brand & Material Tiers
- Top Tier (OEM Equivalent & Performance): NGK and Denso are top performers, especially their Iridium and Ruthenium plugs. These are highly recommended for all Interceptor engines, and are essential for the 3.5L EcoBoost. They offer the longest life and most consistent performance.
- Reliable Mid-Tier: Bosch, Champion, and Autolite offer excellent platinum and double platinum plugs that are a significant upgrade over standard copper plugs and suitable for the naturally aspirated 3.7L and 3.3L engines. 🎬 Watch: Step-by-step spark plug replacement for the 3.7L V6 engine.
- Budget/Standard: Basic copper or nickel plugs, like some entry-level Champion or Accel options, are not recommended for the demanding Interceptor engines. They have a much shorter service life and may not perform well under high stress.
A Note on EcoBoost Engines
The 3.5L and 3.0L EcoBoost engines are particularly sensitive to spark plug quality and gap. Ford's official replacement interval is 100,000 miles, but many owners and mechanics recommend changing them every 40,000-60,000 miles to maintain peak performance and avoid misfires. Using a colder heat range plug, like the Ford Performance M-12405-35T, is also a common upgrade for tuned or hard-driven EcoBoost engines.
Cost of Spark Plug Replacement (2013-2024 Ford Police Interceptor Utility)
| Item | Estimated Cost |
|---|---|
| Aftermarket Spark Plugs (Set of 6) | $35 - $150 |
| OEM (Motorcraft) Spark Plugs (Set of 6) | $48 - $70 |
| Shop Labor | $294 - $431 |
| Total Professional Replacement | $342 - $500+ |
Note: Labor costs are higher because replacing the three spark plugs on the back side of the engine requires removing the upper intake manifold, a more time-consuming process.
Frequently Asked Questions
How often should I replace the spark plugs on my Police Interceptor Utility?
For naturally aspirated engines (3.7L, 3.3L), Ford recommends every 100,000 miles. For EcoBoost engines (3.5L, 3.0L), while the official interval is also 100,000 miles, it is highly recommended to replace them every 40,000-60,000 miles due to the higher stress from the turbochargers.
What is the correct spark plug gap?
The correct gap varies by engine and plug type. For example, the 3.7L V6 often requires a gap between .049" and .053". Most quality aftermarket plugs come pre-gapped, but it is crucial to verify the gap with a feeler gauge before installation. An incorrect gap is a common cause of misfires, especially in EcoBoost engines.
Should I use Iridium or Platinum plugs?
Iridium plugs are the best choice for all Interceptor engines, offering the longest life and best performance. They are considered essential for the high-heat, high-pressure environment of the EcoBoost engines. Platinum plugs are a good, durable option for the naturally aspirated 3.7L and 3.3L engines.
Do I need to replace the ignition coils with the spark plugs?
It is not required, but it is often recommended as preventative maintenance, especially on higher-mileage vehicles. The ignition coils sit directly on top of the spark plugs, and you have to remove them to access the plugs anyway. If one coil has failed, it's often a good idea to replace them all as a set, along with the plugs.
🎬 Watch this guide on replacing both spark plugs and coil packs.Helpful Videos
Technical Specifications
OEM Part Numbers: SP580X SP589 CYFS12Y CYFS12F5
Engine compatibility is key. The 3.5L EcoBoost, 3.7L Ti-VCT, 3.3L V6, and 3.0L EcoBoost engines have different requirements. Most require Iridium or Platinum fine-wire plugs with a 14mm thread. The recommended service interval is typically 100,000 miles, but is shorter for EcoBoost models under heavy use.
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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.
- Ford Police Interceptor Utility:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Signs of Failing Spark Plugs in Your Interceptor
- Known Issues: 2020-2022 3.3L Engine Recall
- Choosing the Right Aftermarket Spark Plugs
- OEM vs. Aftermarket
- Brand & Material Tiers
- A Note on EcoBoost Engines
- Cost of Spark Plug Replacement (2013-2024 Ford Police Interceptor Utility)
- Frequently Asked Questions
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