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If your Infiniti FX35 is showing rough idling, hesitation, or reduced throttle response, choosing the right fuel injector matters for drivability and long-term engine health. This guide covers the top shortlisted fuel injectors selected for the Infiniti FX35 and explains the functional differences that typically affect everyday use. We evaluated candidates based on fitment accuracy, flow rate consistency, spray pattern, and durability under typical driving conditions. Read on to see the top picks and the criteria that informed our selections.
Looking for other parts? See all Infiniti FX35 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Hsingach Fuel Injectors Set of 6 for Infiniti G37/M37/Q50/Q60/Q70/QX50/QX70 3.7L (16600EY00A) |  |
| Most Popular A crowd favorite that many people choose with confidence | Pjvmvo FBJC100 Fuel Injectors (Set of 6) |  |
| Best Quality Built to a higher standard if you want something more solid | ProXlex 6-Pack Fuel Injectors Compatible with Nissan/Infiniti 3.5L (16600-6KA0A) |  |
| Best Budget The cheapest option that still gets the job done reliably | SCITOO Fuel Injector (6-pack) for Infiniti FX35/EX35/G35/M35/QX60 fitments |  |
| Most Sold A high-volume bestseller chosen again and again | SONAKY Fuel Injector Set for Nissan Pathfinder / Infiniti QX60 3.5L (16600-6KA0A) – 6 Pack |  |
| Best Value for Money The sweet spot between price and what you get | AISHAN Fuel Injectors (6-pack) Compatible with Infiniti FX35 3.5L V6 |  |
| Best Overall The best all-around choice for most situations | A-Premium Set of 8 Fuel Injectors (Replacement for Nissan/Infiniti V8 5.6L) |  |
1. Hsingach Fuel Injectors Set of 6 for Infiniti G37/M37/Q50/Q60/Q70/QX50/QX70 3.7L (16600EY00A)
| Compatible engines | Infiniti 3.7L (listed models) |
|---|---|
| Number of injectors | Set of 6 |
| Inlet connection | O-ring |
| Outlet connection | Barb |
| Number of ports | 12 |
These Hsingach injectors are sold as a six-pack direct-replacement for 3.7L Infiniti engines that use part number 16600EY00A. They are intended to replace failing or worn injectors to correct rough idle, misfires, check-engine codes, and poor fuel economy. Installation is the same as a factory replacement: remove the fuel rail, swap the injectors, lubricate the O-rings, and reinstall. Notable features include 12 injection ports matching the original configuration, O-ring inlet fittings, and individual testing before shipment. In real use buyers report restored smooth idle, reliable starts, and even fuel delivery during steady driving. The package includes spare O-rings and tight packaging to protect components. Limitations are typical of aftermarket parts: fit can be snug and may require cleaning the injector ports for easy seating, and long-term durability compared with factory-quality injectors is less certain since this is not a branded OEM part. Expect a cost-effective repair that gets a high-mileage Infiniti running properly again but consider professional installation if you are not comfortable with fuel-system work.
Best for: Reliability-focused owners who prioritize restoring consistent engine performance on a 3.7L Infiniti and want a full-set repair that addresses misfires and idle problems without paying dealer pricing.
Less Ideal for: Drivers seeking guaranteed factory-quality lifetime durability or those unwilling to accept the small variability sometimes seen with aftermarket fuel-system parts should consider factory replacement options or professional remanufactured injectors.
- Sold as a complete set of six so all cylinders are renewed at once
- Direct-replacement design with matching 12 injection ports for the specified 3.7L engines
- Individually tested before shipment and packaged with spare O-rings
- Reported to restore smooth idle, starts, and steady fuel delivery in real-world use
- Aftermarket part so long-term reliability versus factory-quality injectors is unknown
- May require cleaning of injector ports or extra force during installation due to tight O-ring fit
Verdict A cost-effective six-pack of direct-replacement injectors that reliably restores fueling on the specified 3.7L Infiniti engines, with the usual caveat about long-term aftermarket durability.
2. Pjvmvo FBJC100 Fuel Injectors (Set of 6)
| Fitment note | Compatible with Infiniti FX35 3.5L V6 (2001-2004) as listed |
|---|---|
| Set quantity | Set of 6 |
| Included parts | O-rings and gaskets included |
| Part numbers referenced | Replace# 166005L700, FJ653 |
These Pjvmvo FBJC100 injectors are a direct-fit replacement set intended to restore metering and atomization for a 3.5L V6 Infiniti engine. Sold as a set of six, the injectors arrive flow tested and balanced with O-rings and gaskets included to simplify installation. In typical use they replace worn or leaking units to recover steady idle, smoother acceleration, and more consistent fuel trims; the listing notes retained OEM duty cycle and pulse width so they work with factory fuel control strategies. Practical benefits include plug-and-play fitment for the specified vehicles, pre-testing at the factory, and included sealing parts to reduce installation headaches. Limitations are that this is an aftermarket component rather than a factory part and long-term durability may vary with fuel quality and driving conditions; professional installation or calibration checks are recommended if the vehicle has other fuel- or air-system faults. For owners focused on convenience, these injectors are a straightforward way to get a problematic engine back to normal operation without complex modifications.
Best for: Convenience-driven owners who want a quick, plug-and-play repair to restore drivability on an Infiniti FX35 with a 3.5L V6 and prioritize a simple installation and included hardware.
Less Ideal for: Buyers looking for an exact factory-manufactured injector or those planning performance tuning that requires custom flow rates should consider alternative options.
- Direct-fit replacement designed for the specified 3.5L V6 Infiniti application
- Set of six units shipped with O-rings and gaskets for easier installation
- Flow tested and balanced at manufacture to help ensure even fuel delivery
- Retains factory duty cycle and pulse width for compatibility with stock fuel control
- Aftermarket part so long-term durability may not match factory-original units
- Requires correct fitment verification and proper installation to avoid drivability issues
Verdict A convenient, plug-and-play aftermarket set that restores fuel delivery for the FX35 3.5L V6 without requiring extra parts or modification.
3. ProXlex 6-Pack Fuel Injectors Compatible with Nissan/Infiniti 3.5L (16600-6KA0A)
| Brand | ProXlex |
|---|---|
| Material | Metal |
| Number of Ports | 6 |
| Inlet Connection Type | O-ring |
| Outlet Connection Type | O-ring |
These ProXlex injectors are sold as a complete six-pack intended to replace worn or failing injectors on 3.5L V6 engines. They are built with machined metal housings and O-ring inlet and outlet connections for a factory-style seal, and arrive as direct replacements that installers can drop into the fuel rail without modification. In practical use the kit lets you service all cylinders at once, which is useful when symptoms like rough idle, misfires, or poor throttle response affect multiple cylinders. The main benefits are straightforward fitment, a full-set refresh that evens out fueling across the bank, and a one-year return policy if fit or function is unsatisfactory. Limitations include the lack of detailed flow or spray pattern specs from the maker and no claimed calibration or testing data, so performance parity with factory injectors depends on manufacturing consistency. Expect to follow standard installation steps and to have the system inspected after installation for leaks and proper function.
Best for: Performance-oriented owners looking to restore consistent fueling on an Infiniti FX35 and willing to replace all injectors together to reduce variability across cylinders.
Less Ideal for: Owners seeking injector upgrade parts with documented flow and spray specs for high-performance tuning or those who need individual injector calibration and testing.
- Complete six-injector kit allows replacing the entire bank at once
- Machined metal construction for durability compared with cheap plastic-bodied units
- O-ring inlet and outlet fitment for a factory-style seal
- Packaged as direct replacements to simplify installation
- Manufacturer does not publish flow rates or spray patterns for precise tuning
- No documented bench testing or calibration data to confirm exact OEM performance
Verdict A convenient six-pack of factory-style replacement injectors that can restore consistent fueling on 3.5L Infiniti engines but lacks published flow and testing data for performance tuning.
4. SCITOO Fuel Injector (6-pack) for Infiniti FX35/EX35/G35/M35/QX60 fitments
| Package | 6pcs Fuel Injector |
|---|---|
| Orifice Type | 12 holes disc |
| Fuel Type | Petrol |
| OE Part Number | 16600-JK20A |
These SCITOO fuel injectors are sold as a six-pack intended to replace worn units on compatible Infiniti engines. They install in the factory fuel rail and are used to restore proper fuel metering and spray atomization when injectors are leaking or clogged. The listing emphasizes OEM-equivalent flow rate and includes O-rings to help prevent fuel vapor leaks. In practice this means the parts should re-establish smooth idle, easier starts, and more consistent acceleration compared with degraded injectors. The injectors use a multi-hole orifice design aimed at finer atomization, which supports drivability and fuel economy when matched to the original calibration. Limitations to note are that these are aftermarket replacements rather than factory parts and fitment must be confirmed against the vehicle VIN and OE part number before installation. Professional installation or careful bench testing is recommended to avoid compatibility or sealing issues when swapping all six units on an Infiniti engine.
Best for: Budget-conscious Infiniti owners who prioritize replacing a full set of injectors affordably to restore drivability and reduce fuel-related issues.
Less Ideal for: Drivers seeking guaranteed factory-brand longevity or those who prefer professional remanufactured injectors with documented testing should consider other options.
- Sold as a complete six-pack for multi-cylinder Infiniti engines so all injectors can be replaced at once
- Manufacturer states flow rate matches original to maintain engine calibration
- Includes O-rings to address common sealing and leak issues
- Multi-hole orifice design promotes finer fuel atomization for smoother acceleration
- Aftermarket unit rather than factory-made so exact longevity and tolerance match can vary
- Fitment requires verifying OE part number or VIN to ensure correct application
Verdict A cost-focused six-pack solution that restores fuel delivery for compatible Infiniti models but requires careful fitment verification and accepts the usual variability of aftermarket parts.
5. SONAKY Fuel Injector Set for Nissan Pathfinder / Infiniti QX60 3.5L (16600-6KA0A) – 6 Pack
| Brand | SONAKY |
|---|---|
| Model | Fuel Injector |
| Item model number | 16600-6KA0A |
| Manufacturer Part Number | SEY-231 |
This SONAKY fuel injector set supplies six direct-replacement injectors intended to restore fuel delivery on compatible 3.5L engines. The kit is typically used when multiple injectors show wear, poor spray pattern, or cause rough idle and drivability problems; replacing all six at once helps ensure even performance. The listing emphasizes high-quality raw materials and factory-style manufacturing for consistent operation across varying conditions, and the package is sold as a full six-piece set for straightforward batch replacement. Installation is described as direct replacement, which should simplify fitment for vehicles that use the 16600-6KA0A part number. Limitations include the need to confirm exact part-number compatibility before purchase and the absence of detailed technical specs such as flow rate or electrical resistance that some technicians use to match injectors precisely. For risk-averse buyers focused on reliable, like-for-like swaps, this set offers a practical route to refresh worn injectors, but shops that require measured injector data may need to test units after installation.
Best for: A risk-averse mainstream buyer seeking a straightforward, like-for-like injector replacement to restore reliable everyday drivability without chasing performance tuning details.
Less Ideal for: Performance tuners or technicians who need measured flow and resistance data for matched sets should consider injectors with published specifications and bench testing.
- Sold as a complete six-injector set for simultaneous replacement
- Designed to match the listed factory part number 16600-6KA0A for direct fit
- Manufacturer states use of high-quality materials and manufacturing for stable performance
- Simplifies repair by replacing all injectors at once, reducing staggered wear issues
- No published flow rate or electrical specs for precise matching and dyno tuning
- Fitment requires manual confirmation of part number before purchase
Verdict A convenient six-pack intended as a factory-style swap for vehicles using part 16600-6KA0A, best for buyers who prioritize simple, reliable replacement over tunable injector data.
6. AISHAN Fuel Injectors (6-pack) Compatible with Infiniti FX35 3.5L V6
| Fitment | Infiniti FX35 3.5L V6 2005-2008 |
|---|---|
| Number of ports | 4 |
| Terminals | 2 pins |
| Material | Composite plastic and stainless steel |
These AISHAN fuel injectors are sold as a six-piece kit intended as a direct replacement for the factory injectors on the Infiniti FX35 3.5L V6. They use a four-hole atomizing nozzle and two-pin electrical connection to deliver a wider spray angle for more complete fuel-air mixing, which the manufacturer says helps reduce vibration, restore smooth idle, and improve fuel efficiency. The injectors come pre-installed with viton O-rings and stainless steel/composite construction aimed at resisting leaks under higher pressures. Installation is plug-and-play for someone comfortable with basic engine work and the listing includes simple steps for removal and reinstallation. Limitations to note are that these are aftermarket parts rather than factory-brand injectors and claimed performance gains are manufacturer statements rather than independent test results. Also proper cleaning of ports and attention to connector condition are needed during fitment to avoid issues. For a budget-minded replacement on an FX35, this kit offers a complete set and straightforward swap-in capability.
Best for: Practical optimizers looking for an affordable, complete injector replacement for the Infiniti FX35 who prioritize fixing drivability issues and restoring smooth operation without paying for dealer parts.
Less Ideal for: Drivers seeking factory-brand injectors backed by dealer testing or professional shops that prefer to source OEM-specified parts should consider alternatives.
- Sold as a full six-injector kit to replace all cylinders at once
- Four-hole atomizing nozzle for broader spray and more complete combustion
- Pre-installed viton O-rings and stainless/composite construction to reduce fuel leaks
- Designed for plug-and-play installation with a factory-style two-pin connector
- Aftermarket unit so performance and longevity may vary compared with factory-brand injectors
- Manufacturer performance claims such as specific horsepower or torque gains are not independently verified
Verdict A full six-pack aftermarket kit that makes replacing all injectors on an Infiniti FX35 affordable and straightforward, but it is an aftermarket option rather than a factory-brand part.
7. A-Premium Set of 8 Fuel Injectors (Replacement for Nissan/Infiniti V8 5.6L)
| Fuel Type | Gas |
|---|---|
| Terminal Type | Blade |
| Number of Ports | 16 |
| Static flow | 148 ml/30s |
| Dynamic flow | 14.1 ml/30s |
These A-Premium injectors are sold as a set of eight replacement units intended to restore fuel delivery on compatible Nissan and Infiniti 5.6L V8 engines. They are typically used when original injectors fail or when solving misfire and rough-idle symptoms; installers will appreciate that O-rings and standard blade terminals are included for a direct swap. The listing reports static and dynamic flow figures and states the nozzles are designed to improve atomization, which can help smooth idle and improve drivability when matched to the correct engine. Buyers should note these are aftermarket replacements rather than factory-brand parts, so long-term durability may vary and some customers report slightly louder operation than factory units. Installation is straightforward for a competent DIYer or technician, but proper testing and calibration after fitment are recommended to ensure balanced performance across all cylinders.
Best for: Balanced buyers who prioritize restoring drivability and value over sourcing factory-brand parts and who want a full-bank replacement to address misfires or rough idle.
Less Ideal for: Buyers seeking a direct manufacturer-brand replacement for long-term OEM parity or those who require proven long-term durability for high-mileage performance applications.
- Sold as a full set of eight for complete bank replacement
- Includes O-rings and standard blade terminals for straightforward installation
- Specified static and dynamic flow numbers give installers data to compare against originals
- Designed nozzle pattern aimed at improved fuel atomization and smoother idle
- Aftermarket construction means longevity may not match factory-quality parts
- Some users report injectors are louder at idle compared with factory units
Verdict A practical full-set aftermarket replacement that restores fuel delivery and smooths idle on compatible Nissan/Infiniti 5.6L V8s, with a modest durability compromise versus factory-brand injectors.
Choosing the Right Infiniti FX35 Fuel Injector: Key Factors to Consider
Fitment and Connector Compatibility
Accurate physical fit and matching electrical connectors are essential because incorrect fitment can lead to leaks, poor electrical contact, and diagnostic trouble codes. Ensure the injector body length, O-ring diameters, and mounting interface align with the Infiniti FX35 fuel rail and intake manifold to avoid installation complications.
Connector compatibility matters for reliable signal transmission from the engine control module. Mismatched pins or housings may require splicing or adapters, which can introduce failure points. Choosing an injector with OEM-style connectors reduces installation time and the risk of intermittent faults.
Flow Rate and Calibration
Flow rate determines how much fuel the injector delivers at a given pulse width and rail pressure. An injector with flow characteristics that deviate from the factory specification can cause lean or rich running conditions, leading to poor idle quality, reduced performance, or higher emissions. Look for injectors that are rated or tested to match the FX35 factory flow curve.
Consistent flow across all injectors is also important. Variance between injectors can create cylinder imbalance, roughness, and uneven wear. If a set is supplied, check that the vendor provides flow-matched data or offers tested groupings to minimize cylinder-to-cylinder variation.
Spray Pattern and Atomization
The injector spray pattern affects how fuel mixes with incoming air and where fuel lands in the intake port or combustion chamber. A proper pattern promotes finer atomization, which supports more complete combustion, smoother idle, and better throttle response. For direct fit applications, choose injectors designed to replicate the original spray characteristics for the FX35 engine.
Poor atomization or an asymmetric spray can lead to carbon buildup, rough running, and cold-start issues. Consider injectors that are specified for good spray quality or that come with laboratory spray visualization data when available.
Seal Materials and Leak Resistance
Injector seals and O-rings must withstand fuel, heat cycling, and vibration. Degraded seals allow external leaks or air ingress that disturb fuel metering, which may cause rough idle or fuel odor. Different materials perform better with varied fuel formulations and temperatures, so select injectors with compatible polymers for the operating environment of the FX35.
Pay attention to how the injector interfaces with the rail and intake. Robust sealing design reduces the likelihood of rail-to-intake vacuum leaks and helps maintain consistent fuel pressure at the injector inlet.
Electrical Characteristics and Response Time
Electrical coil design and armature mass determine the injector's response time and how quickly it opens and closes. Fast, consistent response improves metering precision at low pulse widths, which is important for smooth idle and transient throttle response. Electrical impedance should be compatible with the FX35's fuel injection drivers to avoid overloading the control circuitry.
Also consider thermal stability of the coil and housing. Components that tolerate repeated heat cycles without drifting in performance help preserve long-term drivability and reduce the chance of intermittent faults.
Serviceability and Cleaning
No injector is immune to contamination, so the ability to clean and restore spray quality matters. Some injectors tolerate ultrasonic or professional cleaning better than others, and construction choices influence how often cleaning is required. Choose injectors with accessible service data and recommended cleaning intervals to keep the FX35 running well.
Additionally, consider the availability of replacement seals and the ease of removing and reinstalling injectors. Simpler service reduces labor time and the risk of installation errors during maintenance.
FAQ
What are common symptoms of a failing fuel injector on an Infiniti FX35?
Common signs often include rough idle, hesitation or stumbling under acceleration, and occasional misfires. You may also notice reduced fuel economy or a strong fuel smell if an injector is leaking. These symptoms can vary in intensity and may appear intermittently depending on the failure mode.
Can I clean fuel injectors myself or should I seek professional service?
Light cleaning with recommended additives may help with minor deposits, but deeper clogging often requires professional ultrasonic cleaning or flow testing. If symptoms persist after basic maintenance, a professional service can diagnose flow and spray pattern issues and determine whether replacement is necessary.
How do I know if an injector is electrically faulty on my FX35?
Electrical faults can show up as misfires or trouble codes related to fuel trim or injector circuit faults. You can check coil resistance with a multimeter and compare readings across injectors, but matching expected values does not guarantee proper operation. Diagnostic testing with a scope or a specialized injector tester provides more definitive information.
Are all replacement injectors the same quality for the Infiniti FX35?
No. Injectors vary in manufacturing tolerances, materials, and testing standards. Choose options that specify fitment for the FX35 and provide flow-matched data or documented testing to reduce the risk of driveability issues. Avoid generic units without compatibility documentation.
What maintenance helps extend fuel injector life?
Using appropriate fuel, following recommended fuel filter service intervals, and addressing intake and PCV system issues can reduce contamination risk. Periodic inspection and professional cleaning when deposits are suspected help maintain spray quality and consistent flow over time.
How We Chose the Best Infiniti FX35 Fuel Injector
We narrowed candidates by focusing on components designed specifically for the Infiniti FX35 engine and matching original equipment flow specifications. Key evaluation criteria included fitment and connector compatibility, measured flow rate consistency across injectors, spray pattern quality that affects combustion efficiency, materials and seals that resist common failure modes, and expected service life under normal driving conditions. We also considered electrical characteristics to ensure proper operation with the factory fuel management system and tested reports of clogging resistance and ease of maintenance. Exclusions included universal or generic injectors without documented FX35 compatibility, injectors requiring extensive modification to install, and components with unresolved reliability concerns. The result is a list of injectors that meet the practical demands of installation, driveability, and routine maintenance for the Infiniti FX35.
Our full evaluation process is outlined in our review methodology.
Conclusion
When replacing injectors on an Infiniti FX35, prioritize fitment, flow consistency, and spray quality to preserve smooth idle and reliable throttle response. Balance ease of installation and serviceability against electrical and sealing robustness to minimize future problems. Expect tradeoffs between long-term durability and replaceability. Focus on injectors that match the FX35 specifications and offer clear service data so you can maintain performance without unexpected drivability issues.
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