2006-2012 Eclipse & 2005-2012 Galant 2.4L Fuel Injector Guide: Symptoms, Costs, and Used Buying Tips

Symptoms of a Failing Fuel Injector

A bad fuel injector on your 2006-2012 Mitsubishi Eclipse or 2005-2012 Mitsubishi Galant with the 2.4L engine will usually make itself known through poor engine performance. Because the injector's job is so critical, even a small problem can have a big effect. Here are the most common signs to watch for:

• Rough Idle and Engine Vibration: This is one of the most common symptoms. If an injector is clogged or not firing correctly, one cylinder won't be producing as much power as the others. This imbalance makes the engine shake or vibrate, especially when idling at a stoplight.
• Engine Misfires and Stalling: A clogged or dead injector starves a cylinder of fuel, preventing combustion. This is called a misfire, and it can feel like a stumble or hesitation from the engine. In severe cases, the engine may stall completely. The Check Engine Light will often illuminate with misfire codes, such as a general P0300 (Random Misfire) or a cylinder-specific code like P0301, P0302, P0303, or P0304.
• Poor Fuel Economy: If you find yourself visiting the gas station more often, a faulty injector could be the culprit. A leaking injector can dump too much fuel into the cylinder, while a clogged one can cause the engine's computer to overcompensate, both of which waste gasoline.
• Fuel Smell: A strong smell of raw gasoline from the engine bay is a serious red flag. This can be caused by an injector that is leaking externally from its seals or a crack in its body. This is a fire hazard and should be addressed immediately.
• Hard Starting: If the injectors aren't delivering the right amount of fuel during startup, the engine may take longer to crank before it fires up, or it may not start at all. This can be more noticeable on a cold start.
• Hesitation and Poor Acceleration: When you press the gas pedal, your car should respond smoothly. A faulty injector can cause a delay or stumble during acceleration because the engine isn't getting the fuel it needs to produce more power.

Known Issues, Recalls, and TSBs

While there are no specific recalls or widespread Technical Service Bulletins (TSBs) for fuel injector failure on the 2006-2012 Mitsubishi Eclipse or 2005-2012 Mitsubishi Galant, it's important to be aware of related fuel system recalls for these vehicles. These issues do not directly involve the injectors, but they concern the overall fuel system's integrity.

• Fuel Tank Strap Bracket Recall (NHTSA #08V460000): This recall affects some 2005-2007 Galant and 2006-2007 Eclipse models. A mounting bracket for the fuel tank strap could fail, potentially allowing the fuel tank to drop and cause a fuel leak, which increases the risk of a fire.
• Fuel Pump/Return Line Recall: Some earlier model year vehicles (outside the primary range but good to know for Galant owners) had recalls related to fuel pump fittings that could restrict flow or leak.

The absence of specific injector recalls suggests that the original Denso injectors are generally reliable and not prone to widespread premature failure. Most issues that arise are due to age, mileage, and fuel quality leading to clogs or normal wear and tear.

Buying a Used Fuel Injector: What to Look For

Purchasing a used OEM fuel injector can be a smart, cost-effective repair. Original Denso injectors are high-quality parts, and a good used one is often a better choice than a cheap, new aftermarket part that may not have the same flow rate or spray pattern. Here’s what to check before you buy:

• Verify the Part Number: This is the most important step. Ensure the used injector matches the OEM part number from your vehicle. The primary numbers are 1465A051 (Mitsubishi) and 195500-0281 (Denso). Do not rely on visual appearance alone.
• Physical Inspection: Carefully inspect the injector for any signs of damage. Look for cracks in the plastic body, corrosion on the electrical connector pins, and damage to the nozzle (pintle) cap. Do not buy an injector that is bent, cracked, or heavily corroded.
• Source and Mileage: If possible, choose injectors from a reputable seller who can provide information about the donor vehicle. An injector from a lower-mileage, accident-damaged car is generally a better bet than one from a high-mileage vehicle that was junked for engine failure.
• Consider a Matched Set: If you are replacing one injector, it's often wise to replace all four, especially on a higher-mileage engine. Buying a used, flow-tested set ensures that all cylinders are receiving a similar amount of fuel, which leads to a smoother running engine.
• O-Rings and Seals: Assume you will need to replace the rubber O-rings and seals. These parts become hard and brittle with age and are a common source of fuel or vacuum leaks. New seal kits are inexpensive and should always be installed with a used injector.

Replacement Overview & Difficulty

Replacing the fuel injectors on the 2.4L 4G69 engine in the Eclipse and Galant is a manageable job for a DIYer with basic tools.

• Difficulty: 2 out of 5
• Estimated Time: 1-2 hours
• Process: The injectors are located on a fuel rail mounted to the intake manifold. The basic steps involve relieving fuel pressure, disconnecting the battery, unplugging the electrical connectors from each injector, unbolting the fuel rail, and then pulling the rail up to release the injectors. The new or used injectors are then fitted with new O-rings (lubricated with a little engine oil or gasoline to prevent tearing), seated into the rail, and the assembly is reinstalled.

Cost Comparison

The cost for fuel injectors can vary significantly. Here are some typical price ranges for a single injector for the 2.4L Eclipse or Galant:

Frequently Asked Questions