Mitsubishi Eclipse Fuel Injector Guide for 1990-1995 Models
Keep your 1G Eclipse running strong with the right new aftermarket fuel injectors.
- Verify your engine type (1.8L, 2.0L NT, or 2.0L Turbo) before ordering, as injectors are not interchangeable.
- Turbo models use low-impedance injectors and a resistor pack; non-turbo models use high-impedance injectors without a resistor pack.
- Always replace injector O-rings and seals to prevent dangerous fuel leaks.
- Replacing all four injectors at once is the best practice for balanced engine performance and long-term reliability.
Is Your Eclipse Running Rough? It Could Be the Fuel Injectors.
If you own a first-generation (1G) Mitsubishi Eclipse, you know these cars can be incredibly rewarding. But after 30 years, some parts just wear out. Fuel injectors are a common failure point that can cause a range of frustrating issues. Symptoms often start small, like a slightly rough idle, but can lead to more serious problems if ignored.
Common Symptoms of Failing Fuel Injectors
- Rough Idle or Stalling: The engine may shake or feel unstable when stopped.
- Engine Misfires: You might feel a stutter or hesitation during acceleration.
- Poor Fuel Economy: A leaking or inefficient injector wastes gas, causing you to fill up more often.
- Check Engine Light: While pre-1996 vehicles have simpler diagnostics, a failing injector can still trigger a fault code.
- Fuel Smell: A strong smell of gasoline around the engine bay could indicate a leaking injector O-ring or a stuck-open injector.
Choosing the Right Aftermarket Injectors for Your Eclipse
Finding new OEM (Original Equipment Manufacturer) fuel injectors for a 1G Eclipse can be difficult and expensive. This makes high-quality aftermarket parts a practical choice for most owners. The key is to select a reputable brand and, most importantly, the correct part for your specific engine.
Engine Differences are Critical
The 1990-1995 Eclipse came with several engines, and they do not use the same fuel injectors. Ordering the wrong one will cause your car to run poorly, if at all.
- 1.8L (4G37 Engine): Uses smaller, high-impedance injectors (approx. 210cc).
- 2.0L Non-Turbo (4G63 Engine): Uses high-impedance injectors (approx. 240cc).
- 2.0L Turbo (4G63T Engine): Uses larger, low-impedance injectors. Automatics came with 390cc injectors, while manual transmission models used 450cc injectors. These require an injector resistor pack, which is a common failure point to check during diagnosis.
Aftermarket Brand Quality
When shopping for new aftermarket injectors, you'll encounter several options. Here's an honest look at the brands available:
- Standard Motor Products (SMP): Standard Ignition is a well-known and generally respected aftermarket brand. They produce a vast range of engine management components. While some users report occasional issues, they are often considered one of the better aftermarket suppliers and a good alternative when OEM or top-tier brands like Bosch are unavailable.
- GBR Fuel Injection: GBR Fuel Injection primarily offers remanufactured injectors. Reviews are mixed. Some users have success with them, especially when replacing other fuel system components at the same time. However, others have reported high failure rates, including injectors being stuck open right out of the box, which can lead to serious engine issues like fuel-washed cylinders. 🎬 Watch this review to see if remanufactured injectors are right for you. Given the risks, approaching remanufactured parts from any brand with caution is wise.
How Much Does a New Fuel Injector Cost?
The cost can vary depending on the brand, whether you buy new or remanufactured, and if you do the work yourself. Here is a general breakdown of costs per injector.
| Part Type | Estimated Cost (per injector) |
|---|---|
| New Aftermarket | $56 - $108 |
| Remanufactured | $25 - $75 |
| New OEM | $150+ (if available) |
| Shop Labor | $150 - $300 (for all four) |
Frequently Asked Questions
Do I need to replace all four injectors at once?
It is highly recommended. Fuel injectors are wear items that have all operated for the same amount of time. If one has failed, the others may not be far behind. Replacing them as a set ensures balanced fuel delivery and consistent performance.
What is an injector resistor pack and do I have one?
Only the turbo models (GST, GSX) with low-impedance injectors have a resistor pack. It's a small, finned aluminum box located on the firewall that reduces voltage to the injectors. If it fails, your injectors won't get power, and the car won't start. Non-turbo models do not have this part.
Can I use turbo injectors in my non-turbo Eclipse?
No. Installing larger turbo injectors in a non-turbo car without changing the engine computer (ECU) and tuning it will cause the engine to run extremely rich, foul the spark plugs, and perform poorly. You must use injectors that match your engine's original specifications.
Is replacing the fuel injectors a DIY job?
For a mechanically inclined owner, yes. The process involves relieving fuel pressure, unplugging electrical connectors, unbolting the fuel rail, and swapping the injectors. However, working with the fuel system is inherently dangerous. If you are not comfortable, it is best to leave this job to a professional mechanic.
🎬 Follow this step-by-step guide to replace your fuel injectors safely.Helpful Videos
Technical Specifications
OEM Part Numbers: INP-057 MD156760 INP-059 INP-008 INP-009 MD186379
Vehicle Fitment: 1990, 1991, 1992, 1993, 1994, 1995 Mitsubishi Eclipse. Engine Configurations: 1.8L 4G37 (Base), 2.0L 4G63 (GS, GSX), 2.0L 4G63T (GST, GSX). Impedance: High (Non-Turbo), Low (Turbo). Flow Rates: ~210cc (1.8L), ~240cc (2.0L NT), 390cc (Turbo A/T), 450cc (Turbo M/T).
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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.
- Mitsubishi Eclipse:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Eclipse Running Rough? It Could Be the Fuel Injectors.
- Common Symptoms of Failing Fuel Injectors
- Choosing the Right Aftermarket Injectors for Your Eclipse
- Engine Differences are Critical
- Aftermarket Brand Quality
- How Much Does a New Fuel Injector Cost?
- Frequently Asked Questions
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