INFINITI FX50 Ignition Coil Guide for 2009-2013 Models
Keep your FX50's V8 running smoothly by understanding when and how to replace your ignition coils.
- Stick with OEM (Hitachi) or premium OE-equivalent brands like NGK and Denso for the best reliability.
- If one coil fails after 100,000 miles, consider replacing all eight coils and the spark plugs to prevent future issues.
- A flashing check engine light signals a severe misfire; reduce driving to avoid expensive catalytic converter damage.
- Common OBD-II codes for this issue are P0300 for a random misfire and P0301-P0308 for specific cylinders.
Signs of a Failing Ignition Coil
When an ignition coil on your FX50 starts to fail, the powerful V8 engine can quickly feel sluggish and rough. Because each cylinder has its own coil, a single failure can throw off the engine's balance. Look out for these common symptoms:
- Check Engine Light: This is the most common sign. The light will come on if the engine's computer detects a misfire. A flashing check engine light indicates a serious misfire that could damage your catalytic converters, so you should address it immediately.
- Rough Idle and Misfires: Your engine may shake, vibrate, or sound uneven, especially when stopped at a light. You might also feel jerking or sputtering when you accelerate.
- Reduced Power and Fuel Economy: With one less cylinder firing correctly, your FX50 will feel less powerful and will use more fuel to compensate.
- Difficulty Starting: While a single bad coil on a V8 won't usually prevent the car from starting, it can make it harder to start up and cause it to run poorly right after starting.
Choosing the Right Aftermarket Ignition Coil
When replacing an ignition coil, you have several options ranging from OEM to various aftermarket brands. For the FX50, the original coils were made by Hitachi. Understanding the quality differences can help you make the best choice for your vehicle and budget.
Pro Tip: Replace Spark Plugs at the Same Time
If you're replacing ignition coils due to age or high mileage, it's a smart move to replace the spark plugs as well. Worn spark plugs can strain new coils, causing them to fail prematurely. Since you'll already have everything taken apart, doing both jobs at once saves time and future labor costs.
🎬 Watch: A step-by-step walkthrough of the spark plug replacement process.Brand Quality Tiers
Tier 1: OEM / Premium OE-Equivalent
These brands are either the original manufacturer or are known for producing parts that meet or exceed OEM specifications. They are the most reliable choice for longevity and performance.
- Hitachi: As the original equipment manufacturer for Nissan/INFINITI, Hitachi coils are the go-to for guaranteed fit and performance. They are often available for less than the dealer-branded part.
- NGK: A top-tier brand known for ignition components. NGK coils are a trusted alternative to Hitachi and are highly regarded for their quality and reliability.
- Denso: Another highly respected Japanese OE supplier. Denso parts are known for their durability and performance, making them an excellent choice if available.
Tier 2: Quality Aftermarket
These brands offer a good balance of quality and price. They are a solid choice for most repairs and are often preferred by independent repair shops.
- Delphi: A well-known OE supplier for many American and European brands, Delphi also produces reliable aftermarket coils that are a good alternative to OEM.
- Standard Motor Products (SMP): A long-standing brand in the aftermarket, offering parts that are generally considered reliable.
- Walker Products: Known for fuel and engine management parts, Walker offers a dependable aftermarket option.
Tier 3: Economy/Value
These brands focus on providing the most affordable options. While they can get your vehicle back on the road, their long-term durability may not match that of the higher-tier brands. They can be a good choice for a quick fix or if you are on a tight budget.
- DriveWire
- Skyward
- Global Parts
A Note on Grounding Issues
Some older INFINITI models experienced issues with poor engine grounds causing premature ignition coil failure. A Technical Service Bulletin (TSB) for the earlier FX35 models noted that blistered or melted coils could be caused by bad grounding cables. While not specifically for the FX50, it's good practice to ensure your battery cables and engine ground straps are clean and secure, as this can extend the life of all your vehicle's electronics.
Cost to Replace INFINITI FX50 Ignition Coils
| Item | Estimated Cost |
|---|---|
| Single Aftermarket Ignition Coil | $35 - $150 |
| Single OEM (Hitachi) Ignition Coil | $125 - $200 |
| Shop Labor (One Coil) | $100 - $150 |
| Shop Labor (All Eight Coils) | $250 - $400 |
Note: Costs are estimates and can vary based on your location and choice of repair shop. Labor for replacing all eight coils is less per coil than replacing just one.
Frequently Asked Questions (FAQ)
Should I replace all eight ignition coils at once?
If one coil fails due to high mileage (over 100,000 miles), the others are likely near the end of their service life. Replacing all eight at the same time can save you from repeated repairs and labor costs down the road. If your vehicle has lower mileage and a single coil fails, it's usually acceptable to replace only the faulty one.
🎬 See a mechanic's advice on replacing coils by mileage vs. one-by-one.Is it difficult to replace the ignition coils myself?
For a DIY mechanic with basic tools, this is a manageable job. The coils are located on top of the engine, secured by a single 10mm bolt each. The main challenge is accessing the rear coils, which may require removing the engine cover and air intake components. The job for all eight coils can take 1-2 hours.
What are the common check engine light codes for a bad coil?
A general random misfire code is P0300. Specific cylinder misfires are coded from P0301 (Cylinder 1) to P0308 (Cylinder 8). A code will tell you which cylinder is misfiring, allowing you to identify the exact coil that needs replacement.
Are "performance" ignition coils worth it for my FX50?
For a stock or lightly modified FX50, high-quality OEM-equivalent coils like Hitachi or NGK provide all the spark energy needed for optimal performance. Upgraded "performance" coils typically do not provide a noticeable benefit on an otherwise stock engine and are not necessary.
Helpful Videos
Technical Specifications
OEM Part Numbers: 22448-EY00A 22448-JA10C 22448-JA00C
The INFINITI FX50 uses a coil-on-plug system with 8 individual ignition coils, one for each cylinder of the 5.0L VK50VE V8 engine.
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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.
- INFINITI FX50: