A Guide to Replacing Fuel Injectors on the 2005-2012 Mitsubishi Eclipse
Keep your 4th generation Eclipse running smoothly by understanding its fuel injector needs.
- Verify if you have the 2.4L 4-cylinder or 3.8L V6 engine, as the injectors are not interchangeable.
- For reliability, it is strongly recommended to replace all fuel injectors as a complete set.
- The V6 engine requires significantly more labor for injector replacement due to the need to remove the intake plenum.
- Be cautious with remanufactured injectors; while cheaper, they have a higher reported rate of out-of-the-box failure.
Is Your Eclipse Showing Signs of a Bad Fuel Injector?
When a fuel injector starts to fail, it can disrupt your engine's performance. The signs can be subtle at first but will worsen over time. Watch for these common symptoms:
- Rough Idling: The engine may shake or vibrate more than usual when you're stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. This is often accompanied by a flashing Check Engine Light and codes like P0300, P0301, P0302, etc.
- Poor Fuel Economy: If an injector is stuck open or leaking, it wastes fuel. You'll notice you're filling up your tank more often.
- Fuel Smell: A strong smell of raw gasoline from the engine bay can indicate a leaking injector or a bad seal, which is a serious fire hazard.
- Difficulty Starting: A leaky injector can flood the engine, making it hard to start, especially when it's warm.
Known Issues for the 2005-2012 Mitsubishi Eclipse
While there are no widespread recalls specifically for fuel injector failure on this generation, there was a safety recall (NHTSA #08V525000) for some 2006-2007 Eclipse models concerning a fuel tank mounting strap bracket. An improperly formed bracket could fail, potentially causing the fuel tank to detach and leak fuel. This is unrelated to injector performance but is an important fuel system safety check for affected model years.
Choosing the Right Aftermarket Fuel Injector
When shopping for new fuel injectors, you have several options. It is critical to buy the correct injector for your engine, as the 2.4L four-cylinder and 3.8L V6 use different parts. Using the wrong one will cause performance issues.
It is highly recommended to replace all injectors at the same time. Since they have all operated for the same number of hours, failure of one is often a sign that others may soon follow. Replacing them as a set ensures balanced fuel flow to each cylinder and prevents future headaches.
Aftermarket Brand Tiers
Not all aftermarket parts are created equal. Here’s a breakdown of the available brands:
- Standard Ignition (Standard Motor Products): Generally considered a higher-tier aftermarket brand. They aim to match OEM specifications for fit, flow rate, and spray pattern. While quality control issues can happen with any brand, Standard is a trusted name among many mechanics for providing a reliable alternative to expensive OEM parts.
- GBR Fuel Injection: This brand offers remanufactured OEM injectors. While this can be a budget-friendly option, the quality can be inconsistent. Some owners have reported receiving injectors that were faulty out of the box, sometimes stuck open, which can lead to serious engine issues like fuel-washed cylinders. Others have used them without issue, but it represents a higher risk.
- Replacement: This is typically a private-label or generic brand. These are basic, value-oriented parts. They can be a good choice for a budget repair, but may not offer the same longevity or precise performance as higher-tier brands.
Pro Tip: V6 vs. 4-Cylinder Installation
Replacing injectors on the 2.4L 4-cylinder engine is a relatively straightforward job for a DIY mechanic. 🎬 Watch: A helpful guide on how to replace fuel injectors yourself. However, on the 3.8L V6, the job is much more complex. It requires removing the upper intake plenum to access the fuel rails, which significantly increases the time and difficulty. 🎬 See this walkthrough for replacing injectors on the Eclipse GT V6. If you have a V6, carefully review the steps or consider professional installation.
Cost of Replacing Mitsubishi Eclipse Fuel Injectors
| Part Type | Estimated Cost (Per Injector) | Notes |
|---|---|---|
| New OEM | $210 - $310 | Highest cost, direct from the manufacturer. |
| New Aftermarket | $50 - $190 | A wide range from basic to premium brands like Standard Ignition. |
| Remanufactured | $35 - $70 | Cost-effective but carries a higher risk of defects. |
| Shop Labor | $150 - $500 | Varies greatly by engine. The 2.4L is on the low end, while the 3.8L V6 is on the high end due to complexity. |
Frequently Asked Questions
Do I need to replace all my fuel injectors at once?
Yes, it is the recommended best practice. Fuel injectors wear out over time. If one has failed, the others are likely nearing the end of their service life. Replacing them all ensures each cylinder gets the same amount of fuel, leading to a smooth-running and efficient engine.
What's the difference between injectors for the GS (4-cyl) and GT (V6)?
They are completely different parts with different flow rates and physical dimensions. The 2.4L 4-cylinder (GS) and 3.8L V6 (GT) engines require specific injectors. You must order the part that matches your engine to avoid serious performance problems.
Can I clean my old injectors instead of replacing them?
While in-tank fuel injector cleaners can help with minor deposit buildup, they cannot fix a mechanically or electrically failed injector. Professional off-car ultrasonic cleaning can be effective, but for the cost and labor involved in removing the injectors (especially on the V6), installing new aftermarket parts is often a more reliable and time-effective solution.
Is a remanufactured injector as good as a new one?
It can be, but there is a risk. A properly remanufactured injector is a used OEM part that has been cleaned, tested, and fitted with new seals and filters. However, quality control can be inconsistent. Some remanufactured injectors fail shortly after installation, making a new, quality aftermarket part a safer bet for a critical component.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1465A051 (2.4L I4) MR578968 (3.8L V6)
The 2005-2012 Mitsubishi Eclipse uses multi-port fuel injection. The 2.4L 4G69 engine uses four injectors, while the 3.8L 6G75 engine uses six. Ensure any replacement part is specified for your exact engine.
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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 Showing Signs of a Bad Fuel Injector?
- Known Issues for the 2005-2012 Mitsubishi Eclipse
- Choosing the Right Aftermarket Fuel Injector
- Aftermarket Brand Tiers
- Pro Tip: V6 vs. 4-Cylinder Installation
- Cost of Replacing Mitsubishi Eclipse Fuel Injectors
- Frequently Asked Questions
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