STANDARD FJ559 Fuel Injector Impulse 091769774875 1.6L-L4

( Brand: Standard ), ( Manufacturer Part Number: FJ559 ), ( Manufacturer Warranty: 1 Year ), ( Type: Fuel Injector ), ( UPC: 091769774875 )

Review STANDARD Fuel Injector Isuzu Impulse 1.6l-l4 fits 1991–1992

The **standard OEM fuel injector for the 1991 1992 Isuzu Impulse 1.6L inline-four engine (part number FJ559)** is a precision-engineered component designed to deliver optimal fuel atomization and combustion efficiency within the vehicle s port-injected fuel system. Manufactured to exacting specifications by Isuzu s original equipment suppliers, this injector is a **top-entry, pintle-style solenoid actuator** with a robust stainless steel body and a durable ceramic or metal-oxide nozzle tip, ensuring long-term resistance to corrosion and thermal stress. The internal design features a **high-flow, multi-hole pintle** that breaks fuel into a fine mist, promoting complete vaporization and maximizing power output while minimizing carbon buildup on intake valves a common issue in older port-injected engines. With a **nominal flow rate of approximately 18 22 cc/minute at 45 psi (3.1 bar)**, this injector is calibrated to match the 1.6L L4 engine s fuel delivery requirements, providing consistent performance under both idle and high-load conditions. The **solenoid coil** is precision-wound with high-temperature-resistant wire, ensuring reliable activation even under prolonged high-demand scenarios, such as aggressive acceleration or towing. For maintenance and longevity, the injector incorporates a **sealed O-ring and gasket system** at the mounting interface, preventing fuel leaks and contamination from external debris. When properly installed and paired with clean fuel and a well-maintained fuel system, this injector helps sustain the Impulse s characteristic smooth throttle response, efficient fuel economy, and the engine s signature torque delivery. Replacement injectors are often sourced from reputable aftermarket brands that adhere to OEM tolerances, though genuine Isuzu parts remain the gold standard for durability and compatibility.

### Pros and Cons of Buying a Standard FJ559 Fuel Injector for a 1991-1992 Isuzu Impulse 1.6L I4

1. **Compatibility and Fit:** The FJ559 fuel injector is a common aftermarket part designed specifically for the 1.6L Isuzu Impulse (and other similar engines like the Honda Civic EF/EFx and Toyota Corolla E10/E11). It is a direct replacement for the stock injectors, ensuring a proper fit without modifications to the fuel rail or wiring harness.

2. **Improved Performance:** Fuel injectors degrade over time due to carbon buildup, clogging, or wear. Replacing them with new, high-quality injectors (such as the FJ559) can restore or even enhance fuel delivery, leading to better throttle response, smoother acceleration, and improved engine efficiency.

3. **Reliability:** Aftermarket injectors like the FJ559 are manufactured to meet or exceed OEM specifications. They are less likely to fail prematurely compared to old, worn-out stock injectors, reducing the risk of stalling, misfires, or poor fuel economy.

4. **Ease of Installation:** These injectors are designed for straightforward installation. They typically come with gaskets and may require minimal adjustments to the fuel rail or wiring. This makes them a practical choice for DIYers or mechanics without specialized equipment.

5. **Cost-Effective Upgrade:** Compared to full engine rebuilds or more extensive modifications, replacing fuel injectors is a relatively inexpensive way to improve engine performance and reliability. The cost is often offset by better fuel efficiency and smoother operation.

6. **Compatibility with Modifications:** If you plan to add performance upgrades (such as a turbocharger, ECU remap, or upgraded fuel pump), new injectors are a necessary step to support increased fuel flow without causing rich conditions or damage.

7. **Reduced Emissions:** Clean, properly functioning injectors ensure optimal fuel atomization and combustion, which can help meet emissions standards and reduce harmful byproducts.

---

1. **Potential for Incompatibility with Aftermarket Parts:** While the FJ559 is designed for the Isuzu Impulse, some aftermarket fuel systems (such as those from turbocharged or heavily modified engines) may require injectors with higher flow rates. Using the wrong size injector (e.g., too small for forced induction) can lead to lean conditions, detonation, or long-term engine damage.

2. **Quality Variability:** Not all aftermarket injectors are created equal. Cheaper brands may have inconsistent flow rates, poor atomization, or shorter lifespans. It s important to research the manufacturer s reputation and read reviews before purchasing.

3. **ECU Calibration May Be Required:** If you re replacing injectors as part of a performance build, the engine control unit (ECU) may need to be recalibrated to account for the new injectors flow characteristics. Failure to do so can result in poor performance or drivability issues.

- Fuel rail cleaning or replacement (if contaminated).

- New fuel lines or connectors.

- ECU tuning (if upgrading for performance).

- Professional installation (if you lack experience).

5. **Risk of Contamination:** If the fuel system is dirty (e.g., clogged fuel lines, a failing fuel filter, or carbon deposits in the intake), new injectors may become clogged quickly. A fuel system clean or replacement may be necessary before or after installation.

6. **Warranty Considerations:** If the vehicle is under warranty, replacing injectors (especially with aftermarket parts) could void certain coverage. Always check with the manufacturer or dealer before proceeding.

7. **Installation Challenges:** While generally straightforward, improper installation (e.g., overtightening, incorrect gasket placement, or damaged O-rings) can lead to leaks or poor sealing. This may require additional time or expertise to resolve.

---

Replacing the fuel injectors in a 1991-1992 Isuzu Impulse 1.6L I4 with standard FJ559 injectors is a practical and beneficial upgrade for most owners. The primary benefits improved performance, reliability, and fuel efficiency outweigh the minor drawbacks, provided you choose a reputable brand and address any related issues (such as fuel system cleanliness or ECU tuning). This is particularly true if you re experiencing symptoms of failing injectors (e.g., rough idle, poor acceleration, or check engine lights).

However, if you plan to push the engine beyond stock specifications (e.g., with a turbo or aggressive tuning), you may need injectors with higher flow rates (e.g., FJ560 or larger) and additional supporting modifications. In such cases, consulting with a performance specialist is advisable.

---

1. **Verify Symptoms:** If your engine is running poorly, misfiring, or losing power, replacing injectors is likely a wise investment. However, rule out other potential issues (e.g., faulty spark plugs, vacuum leaks, or a weak fuel pump) before proceeding.

2. **Choose a Reputable Brand:** Opt for a well-reviewed aftermarket injector, such as those from **Denso, Delphi, or Stanadyne**, which are known for reliability. Avoid no-name brands that may not meet OEM standards.

3. **Clean the Fuel System:** Before installing new injectors, clean the fuel tank, replace the fuel filter, and consider using a fuel system cleaner to prevent clogging. This extends the life of your new injectors.

4. **Consider Professional Installation:** If you re unsure about handling fuel system work, have a mechanic install the injectors to avoid leaks or improper sealing.

5. **Monitor Performance:** After installation, observe the engine s behavior. If issues persist (e.g., rough idle, stalling), the problem may lie elsewhere (e.g., sensors, wiring, or ECU calibration).

6. **Plan for Future Upgrades:** If you re interested in performance modifications, research the appropriate injector size and ECU tuning requirements upfront to avoid compatibility issues.

**Final Verdict:** For a stock or lightly modified 1991-1992 Isuzu Impulse, the FJ559 fuel injectors are a solid, cost-effective choice that will likely yield noticeable improvements in engine performance and reliability. Proceed with confidence, but remain mindful of supporting components and potential long-term goals.

Details:

The image USUALLY shows all the pieces and qty included with part. 217-2947, 4G1343, 624-061, 624-062, A211-1853, AUSMP-50122, FJ559, M765. Information like which side a part fits LEFT or RIGHT and specific vehicle attributes Transmission, AWD/RWD, other exclusions are included for your information in this LEFT COLUMN.

FINISH MATERIAL COLOR shown in the listing image will often vary from actual part shipped. This part fits vehicles made in the following years 1991 ,1992.

part #: fj559 prices

• $178.30-$250.07

specifications carfuelinjector:

• for makes: Isuzu
• for years: 1991-1992
• brand: Standard
• mpn: Fj559
• manufacturer warranty: 1 Year
• type: Fuel Injector
• upc: 091769774875

returns carfuelinjector:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

shipping carfuelinjector:

• class: Standard
• transit: 5-12 Days
• service: USPS Ground Advantage
• cost: $7.30
• carrier: USPS
• type: Fixed

offer carfuelinjector:

• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: April 20, 2026

general carfuelinjector:

• Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
• condition: New

payments carfuelinjector:

• other
• credit card: Diners-club
• wallet: Apple-pay

seller carfuelinjector:

• # reviews: 3948
• rating: 99.6%
• city: Santa Fe Springs, California

Standard FJ559 Is Similar To:

• Sets of 6 NEW Standard FJ703 Fuel Injectors Buick-Cadillac 3.6L V6 2004-2008 (45.7% similar) Sets of 6 new Standard FJ703 fuel injectors 6l v6 Buick allure 2005 - 2008 Buick lacrosse 2005 - 2008 Buick Lucien 2006 - 2007 Buick rendezvous 2004 - 2006 Cadillac CTS 2004 - 2006 Cadillac STX 2004 - 2006 Cadillac sets 2005 - 2006...(April 12th, 2014)
• Fuel Injector Standard FJ793 fits 00-04 Toyota Tacoma 2.7L-L4 (34.4% similar) About the brand Standard motor products, inc...(May 2nd, 2014)
• Fuel Injector Standard FJ739 fits 04-10 BMW X5 4.8L-V8 (34.8% similar) Fuel injector Standard FJ739 fits 04-10 BMW x5 about the brand Standard motor products, inc...(May 15th, 2014)
• Fuel Injector Standard FJ918 fits 90-93 Mercedes 300D 2.5L-L5 (44.3% similar) About the brand Standard motor products, inc...(June 1st, 2014)
• SMP STANDARD DV123 Fuel Injection Valve-Diverter Valve (33% similar) PST, Mon to Fri. About the brand standard motor products, inc...(January 28th, 2014)
• SMP STANDARD DV135 Fuel Injection Valve-Diverter Valve (34.8% similar) About the brand Standard motor products, inc. With several...(January 19th, 2014)
• Standard FJ100 Fuel Injector (53.9% similar) ...(March 19th, 2014)
• Standard FJ1006 Fuel Injector (53.3% similar) About the brand Standard motor products, inc...(March 10th, 2014)
• Standard FJ1011 Fuel Injector (53.3% similar) PST, Mon to Fri. Many are made by the same manufacturers that supply factory parts to BMW, Mercedes-Benz, Volkswagen, Audi, Porsche, Toyota, Honda, Nissan, ford, Chevrolet and Chrysler. The rest are either genuine parts or high end German/Japanese/America...(January 25th, 2014)
• Standard FJ101T Fuel Injector (53.3% similar) ...(April 1st, 2014)
• Standard FJ1041 Fuel Injector (53.3% similar) ...(April 7th, 2014)