INFINITI FX35 (2003-2012) Aftermarket Fuel Injector Guide
Solve rough idling and poor performance in your FX35 by choosing the right new fuel injectors.
- Verify your engine type (VQ35DE for 2003-2008, VQ35HR for 2009-2012) as injectors are not interchangeable.
- It is strongly recommended to replace all six injectors at once for balanced engine performance.
- Hitachi is an OEM supplier for INFINITI, making it a top choice for aftermarket replacement parts.
- A fuel smell is a critical symptom that requires immediate attention due to the risk of fire.
Understanding Fuel Injector Failure in Your FX35
If you're experiencing a rough idle, poor acceleration, or a noticeable drop in fuel economy 🎬 Learn how to diagnose and clean clogged fuel injectors., your FX35's fuel injectors could be the culprit. These components are essential for the performance of your VQ-series engine. While the injectors on the FX35 are generally reliable, they can become clogged or fail over time, leading to significant drivability issues. It's common for symptoms to include engine hesitation, a smell of raw fuel, or the Check Engine Light coming on.
Generation and Engine Differences: VQ35DE vs. VQ35HR
It is critical to buy the correct injectors for your specific vehicle. The 2003-2008 INFINITI FX35 uses the VQ35DE engine, while the 2009-2012 models are equipped with the updated VQ35HR engine. These engines have different fuel system requirements, and the injectors are not interchangeable. Always verify the part fits your exact year before purchasing.
Known Issues: Fuel Leaks & Recalls
While there are no specific recalls for the fuel injectors themselves, early model FX35s (2003-2006) were part of a voluntary safety recall for a cracking fuel filler hose that could lead to fuel leaks during refueling. If you smell fuel, it's crucial to have it inspected immediately, as it could be a fire hazard. The issue may not be the injector itself but another part of the fuel system.
Choosing the Right Aftermarket Fuel Injector Brand
When replacing injectors, you have several options. It's generally recommended to replace all six injectors at the same time to ensure balanced fuel flow and engine performance.
- Hitachi: Hitachi is a Tier 1 OE supplier for Nissan/INFINITI. Choosing Hitachi injectors is the closest you can get to the original parts that came with your vehicle, ensuring OE-level performance and fit. They are a premium choice for reliability.
- Bosch: Bosch is a well-respected global leader in automotive parts. Their injectors are known for quality and are considered a top-tier aftermarket option that often meets or exceeds OEM specifications.
- Standard Motor Products (SMP): SMP is a long-standing aftermarket brand offering a wide range of engine management parts. Their injectors are generally considered a reliable replacement and a good alternative to OE parts.
- Beck Arnley: Beck Arnley specializes in parts for foreign nameplate vehicles and aims to match OE specifications. They often source parts from various manufacturers, and sometimes you may even receive an OEM part in their box. However, quality can be inconsistent depending on the source, with some users reporting issues.
- GBR Fuel Injection: This brand typically offers remanufactured injectors. While a cost-effective option, new injectors are generally recommended for longevity and consistent performance, especially for a critical component like a fuel injector.
Estimated Replacement Costs
| Part Type | Estimated Cost (Set of 6) |
|---|---|
| New Aftermarket | $340 - $1,280 |
| New OEM | $850 - $1,500+ |
| Remanufactured | $200 - $500 |
| Shop Labor | $241 - $353 |
Note: Prices are estimates and can vary based on brand, location, and vehicle specifics. Labor costs reflect typical shop rates for this job.
Frequently Asked Questions (FAQ)
Should I replace all six fuel injectors at once?
Yes. It is highly recommended to replace all six injectors as a set. This ensures that all cylinders receive the same amount of fuel, leading to a balanced, smooth-running engine. Replacing only one can lead to imbalances and require you to do the job again when another old injector fails.
Can I clean my old injectors instead of replacing them?
While professional off-the-car ultrasonic cleaning can be effective for clogged injectors, it cannot repair an injector that has failed electrically. Given the labor involved in removing the injectors on an FX35, replacement with new parts is often the more reliable long-term solution.
Is replacing fuel injectors a DIY job?
For an experienced DIYer, it is feasible. The process involves relieving fuel system pressure, removing the upper intake plenum, disconnecting wiring, and unbolting the fuel rail. However, it requires care and the right tools. If you are not comfortable working with the fuel system, it is best to leave this job to a professional mechanic.
🎬 Watch a step-by-step guide on replacing Nissan and Infiniti injectors.What are the OBD-II codes for a bad fuel injector?
Common codes include P0300 (random misfire) or P0301-P0306 for a misfire in a specific cylinder. You might also see codes P0201-P0206, which indicate a circuit malfunction for a specific injector. A fuel-rich or lean condition code could also point to a faulty injector.
🎬 Check out common symptoms of a failing fuel injector.Helpful Videos
Technical Specifications
OEM Part Numbers: 16600-CD700 16600-JK20A
The INFINITI FX35 uses top-feed, high-impedance fuel injectors. The specific flow rate and connector type differ between the VQ35DE (2003-2008) and VQ35HR (2009-2012) engines.
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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 FX35: