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  3. GB REMANUFACTURING 842-12172

GB REMANUFACTURING 842-12172 Fuel Injector 840660083087 Reman RX-7

fits model: Turbo. make: Mazda. year: 1986–1988.

842-12172 Gb Remanufacturing Fuel Injector-turbo Turbo Reman Fits 86-88 Mazda Rx-7

( Brand: Gb Remanufacturing ), ( Manufacturer Part Number: 842-12172 ), ( Manufacturer Warranty: 90 Day ), ( Type: Fuel Injector ), ( UPC: 840660083087 )

Review GB REMANUFACTURING Fuel Injector turbo Reman Mazda Rx-7 fits TURBO 1986–1988

The **GM Remanufactured 842-12172 Fuel Injector** is a high-performance, precision-engineered component designed specifically for the **1986-1988 Mazda RX-7 (FB turbo model)**, ensuring optimal fuel delivery and engine efficiency in this iconic rotary-powered sports car. This remanufactured injector is built to exacting standards, incorporating a **high-quality solenoid valve, durable O-ring seals, and a precisely machined nozzle** to guarantee reliable operation and consistent spray patterns. The **turbocharged RX-7** demands precise fuel metering to maintain peak performance, and this remanufactured part is engineered to restore factory-like functionality, reducing the risk of lean or rich fuel mixtures that could compromise throttle response, power output, or long-term engine health. Constructed from **high-grade materials**, including corrosion-resistant metals and reinforced plastics, this injector is designed to withstand the demanding conditions of forced induction while maintaining durability over extended use. Whether replacing a worn-out original component or upgrading an older engine, this remanufactured fuel injector ensures **consistent fuel flow, improved cold-start reliability, and enhanced overall drivability**, making it an essential upgrade for enthusiasts seeking to restore or optimize their RX-7 s performance. Backed by GM s remanufacturing expertise, this part is thoroughly tested for **leak-free operation, proper resistance, and accurate spray characteristics**, ensuring it meets or exceeds OEM specifications for a seamless fit and dependable performance. Ideal for both restoration projects and routine maintenance, this injector is a cost-effective solution for maintaining the legendary responsiveness of the RX-7 s turbocharged engine.

**Pros and Cons of Buying a Genuine B Remanufactured Mazda RX-7 Fuel Injector (Part Number 842-12172) for Turbo Models (1986-1988)**

### **Pros**

1. **Reliability and Performance** A remanufactured fuel injector from a reputable supplier like Genuine B ensures that the component is restored to factory specifications. This can improve fuel delivery, engine performance, and throttle response, especially if the original injector was failing or clogged.

2. **Cost-Effective Alternative to New** Purchasing a remanufactured part is significantly cheaper than buying a brand-new OEM injector, which can be difficult to source for older Mazda models. This makes it a practical choice for budget-conscious restorers or DIY mechanics.

3. **Warranty Coverage** Genuine B typically offers warranties on their remanufactured parts, providing some assurance against premature failure. This can be valuable if the injector is critical to engine operation.

4. **Compatibility with Turbo Models** The 842-12172 injector is specifically designed for the turbocharged RX-7 (FD models from 1986-1988), ensuring proper fitment and function with the turbocharged engine s demands.

5. **Easier Maintenance** Remanufactured injectors are often cleaned and tested before sale, reducing the risk of immediate issues compared to used or salvaged parts.

6. **Support for Engine Tuning** If you re working on a turbocharged RX-7, having a reliable injector helps maintain proper fuel delivery, which is crucial for tuning and maximizing power output.

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### **Cons**

1. **Potential for Hidden Issues** Even remanufactured parts can have hidden defects, such as internal wear, electrical failures, or improper sealing. Without thorough testing (e.g., flow bench calibration), performance may not match expectations.

2. **Quality Variability** Not all remanufacturers maintain the same standards. Genuine B is generally trusted, but there s still a risk of receiving a lower-quality part if the supplier cuts corners on refurbishment.

3. **Limited Availability of Support** If the injector fails under warranty, resolving issues may require shipping the part back to the supplier, which can be time-consuming, especially for older car models.

4. **Compatibility with Aftermarket Mods** If the RX-7 has been heavily modified (e.g., custom fueling systems, upgraded turbos, or ECU tuning), the stock remanufactured injector may not perform optimally without additional adjustments.

5. **Installation Challenges** Replacing fuel injectors requires careful handling to avoid damaging wiring, seals, or the fuel rail. Improper installation can lead to leaks, poor performance, or even engine damage.

6. **Cost of Additional Components** Beyond the injector itself, you may need new O-rings, seals, or connectors, which add to the overall expense. Some suppliers don t include these extras.

7. **Longevity Concerns** While remanufactured, these injectors are not designed for extreme longevity. If the engine sees heavy use (e.g., high boost, frequent launches), the injector may wear out faster than expected.

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### **Ending Conclusion**

A **Genuine B remanufactured Mazda RX-7 fuel injector (842-12172)** is a **strong, cost-effective choice** for restoring or maintaining a turbocharged RX-7 from 1986-1988, provided you source it from a reputable supplier. It offers a balance between affordability and reliability, especially if the original injector was failing. However, it is not a "set-and-forget" solution proper installation, periodic maintenance, and potential tuning adjustments may be necessary to ensure optimal performance.

If you re working on a **high-performance or heavily modified turbo RX-7**, consider pairing this injector with a **flow-bench-tested unit** or even an **aftermarket high-flow injector** if stock flow rates are insufficient. Always verify the supplier s warranty and return policy before purchasing.

### **Recommendation**

- **Buy from Genuine B or an equally trusted remanufacturer** (e.g., Mazda Parts America, Summit Racing, or a local Mazda specialist) to ensure quality.

- **Test the injector** (if possible) for proper spray pattern and flow rate before installation.

- **Replace O-rings and seals** during installation to prevent leaks.

- **Monitor fuel delivery** post-installation if the engine runs poorly, consider recalibrating the ECU or upgrading to a higher-flow injector.

- **Budget for potential additional components** (e.g., new wiring harnesses, fuel rail gaskets) if needed.

For most **stock or lightly modified turbo RX-7s**, this remanufactured injector will be a **solid, practical upgrade**. For **high-performance builds**, weigh the pros and cons of aftermarket alternatives carefully.

Details:

This part fits vehicles made in the following years 1986, 1987 ,1988. Reman Multi Port Fuel Injector.

specifications carfuelinjector:

  • for models: Turbo
  • for makes: Mazda
  • for years: 1986-1988
  • brand: Gb Remanufacturing
  • mpn: 842-12172
  • manufacturer warranty: 90 Day
  • type: Fuel Injector
  • upc: 840660083087

returns carfuelinjector:

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

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  • wallet: Paypal
  • credit card: Discover
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seller carfuelinjector:

  • # reviews: 2315
  • city: Los Angeles, California
  • rating: 98.6%

shipping carfuelinjector:

  • transit: 4-8 Days
  • service: Economy
  • cost: $0.00
  • class: Economy
  • type: Fixed

general carfuelinjector:

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

offer carfuelinjector:

  • options: Ship-to-home
  • availability: In Stock
  • started: March 16, 2026
  • sold: 0
  • quantity: 4
for models: turbo, for makes: mazda, for years: 1986-1988, manufacturer warranty: 90 day, type: fuel injector,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 15314987261861881,
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