Rajan Wilcox
The Mitsubishi Eclipse 3G Club is a forum community for owners and enthusiasts of the Mitsubishi Eclipse 3G car model. Members of the forum have discussed various fuel injectors that are compatible with the Mitsubishi Eclipse 3G, including the 270cc injectors from the Diamante and the 4cyl Galant, the 850cc injectors from the 3000GT VR4 Turbo, and the RC 750cc injectors. Some members have also explored the possibility of using the stock injectors from a Nissan 350z, which are top-feed high-impedance Bosch injectors. When replacing fuel injectors, it is important to follow the correct procedures, including draining the coolant, relieving fuel pressure, and disconnecting the battery.
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What You'll Learn
Fuel injector replacement steps
Although it is recommended to get fuel injectors replaced by a professional, you can replace the fuel injectors of your 2003 Mitsubishi Eclipse 3G Club yourself by following the steps outlined below.
Before starting, ensure that your car has been sitting for a couple of days and the engine is cold enough to touch.
Step 1: Disconnect the battery
Disconnect the battery and relieve the fuel pressure in the rail.
Step 2: Remove engine covers
Remove the plastic engine covers using the appropriate socket. Set the covers aside.
Step 3: Disconnect the electrical connectors
Use pliers to disconnect the electrical connectors on each injector.
Step 4: Remove the fuel rail
Remove the bolts and brackets holding the fuel rail in place using a socket and ratchet. Depending on the model, you may need to disconnect the fuel line from the fuel rail. Remove the flat washers from the studs before lifting the fuel rail. Carefully lift the fuel rail off the intake manifold, bringing the injectors with it.
Step 5: Remove the old injectors
Remove the old injectors from the fuel rail. If there is a small metal clip, use a small flathead screwdriver to remove or depress it. Then, grasp the injector and work it back and forth while pulling to remove it. The injector and rail will drip, so have shop towels ready.
Step 6: Clean the injector cylinders
Clean and purge each injector cylinder, removing any fuel, water, or other contaminants. Remove any dirt, grime, or debris near the cylinders or on the injector clamps.
Step 7: Prepare the new injectors
Dip the tip of each new injector into a small amount of engine oil or gasoline to wet the seals and prevent leaks.
Step 8: Install the new injectors
Slide the new injectors into their slots on the fuel rail, ensuring that they are lined up with the corresponding holes on the engine. Press each injector until they slide into place.
Step 9: Reattach the fuel rail
Line up all the injectors over their respective holes, then press and bolt down the fuel rail.
Step 10: Reconnect the electrical connections and battery
Reconnect the electrical connections and the battery. Turn the key to the "on" position and wait 10 seconds before turning to the engine start. This will allow the fuel pump to refill the lines and fuel rails. After the engine reaches the normal idle RPM, turn it off.
Note: It is important to label everything you remove and take pictures of the process to ensure proper reinstallation. Additionally, always wear gloves and eye protection when handling fuel components.
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Interchanging fuel injectors
When it comes to interchanging fuel injectors for the Mitsubishi Eclipse 3G, there are a few things to consider. Firstly, it is important to determine the compatibility of the injectors with the specific model of the Eclipse, which in this case is the 2003 Eclipse Club 3G. While there is limited information specific to the 2003 model, some patterns can be observed from discussions on the 3G model in general.
From forum discussions, it appears that there is no definitive answer on whether all 3G injectors are interchangeable between the different variants (GT, GTS, GS, and RS). However, some users have provided insights based on their experiences and experiments. For example, one user mentions that EVO injectors will fit, along with 1G/2G Eclipse injectors, but this requires the use of an injector clip change and a resistor pack due to low impedance. Additionally, the user mentions that the Diamante and the 4cyl Galant (1999-2003) use 270cc injectors, which could be an option for interchange.
Another user with a 2000 GS considers purchasing RC 750cc injectors but is unsure if they will work with their car's high or low efficiency. Responses suggest that these injectors would only be suitable if the car has a big turbo, otherwise, it would be a waste of money. It is recommended to use smaller injectors, such as 550cc, for smaller turbos. This highlights the importance of matching the injector size and specifications to the specific engine and turbo setup.
In terms of the procedure for replacing fuel injectors, it is advised to refer to the official manuals, which outline steps such as draining coolant, relieving fuel pressure, disconnecting the battery, and removing various components for access. However, some users have shared their experiences, with one mentioning that they did not drain the coolant or relieve the fuel pressure but ensured that the car had been sitting for a couple of days before the replacement.
While the compatibility of fuel injectors with the 2003 Eclipse Club 3G specifically may require further research or consultation with a professional, the insights from the forums suggest that injector interchangeability depends on factors such as engine specifications, turbo presence and size, and electrical compatibility (impedance). It is important to carefully consider these factors and consult reliable sources and professionals before making any modifications to fuel injectors or other vehicle components.
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Fuel injector compatibility
For example, one user with a 2000 gs Eclipse inquired about purchasing RC 750cc injectors from a SAAB owner. They were advised that these injectors would only be suitable if their car had a BIG turbo, otherwise, it would be a waste of money. The same user was also advised to consider stock EVO injectors, which are reported to work well for small to medium turbos.
Another user with a 4-cylinder Eclipse reported increased throttle response after upgrading from 240cc to 275cc injectors. However, they noted that changing injector scaling is crucial to achieving any benefits.
When it comes to impedance, the Eclipse 3G's stock ECU has high-impedance injector drivers. This means that using low-impedance injectors requires wiring in a resistor box, which can be a cost-effective solution if one is adept at soldering.
Additionally, some users have discussed the possibility of using injectors from other vehicles. For example, 42lb Ford injectors or older Supra turbo injectors (440cc, high imp.) as potential options for the Eclipse 3G.
It is important to note that while these discussions provide insights into fuel injector compatibility, they may not cover all the necessary safety precautions and procedures for replacing fuel injectors. It is always recommended to refer to the appropriate manuals and seek guidance from experienced professionals when performing such modifications.
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Fuel injector size
The stock fuel injector size for the 2003 Mitsubishi Eclipse 3G Club GS with a 2.4 L 4-cylinder engine is 270cc. The stock injector size for the 3.0L V6 engine is 220cc.
There is some variation in the answers provided by different sources, with some individuals reporting stock injector sizes of 210cc, 240cc, 260cc, and 275cc for the Mitsubishi Eclipse 3G GT.
It is important to note that not all fuel injectors are interchangeable, and compatibility depends on the specific model and year of the vehicle. When replacing or upgrading fuel injectors, it is crucial to consider factors such as engine size, fuel pressure, and performance goals.
Some common fuel injector sizes that have been discussed by Mitsubishi Eclipse 3G Club owners and enthusiasts include 350cc to 400cc high-impedance injectors, 550cc low-impedance injectors, and 850cc injectors for the 91-99 3000GT VR4 Turbo.
When modifying or upgrading fuel injectors, it is recommended to consult with experienced individuals or forums dedicated to the specific vehicle model, such as the Mitsubishi Eclipse 3G Club community, to ensure compatibility and proper installation.
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Fuel injector efficiency
Fuel injectors are an electrical-mechanical device that opens and closes to allow fuel to enter the engine's combustion chamber. The on-board computer controls the fuel injector by sending out a signal in the form of a pulse. The pulse is measured in milliseconds of open time. The length of the pulse will determine how much fuel is delivered to the engine.
The efficiency of a fuel injector is determined by its ability to deliver the right amount of fuel to the engine. This is influenced by factors such as the fuel being used, the engine's horsepower, and the air-to-fuel ratio (AFR).
For example, E85 fuel requires approximately 30-40% higher fuel flow capacity to achieve the same AFR level as gasoline. This means that the fuel injector must be able to supply more fuel to maintain the same level of efficiency.
To improve the efficiency of a fuel injector, one can consider the following:
- Using an adjustable regulator to boost fuel efficiency
- Upgrading the fuel with a fuel treatment or catalyst to improve fuel economy
- Installing an upgraded fuel pump to provide maximum fuel flow and optimize horsepower and fuel efficiency
- Ensuring that the injector data, including its dead time, is accurate so that the on-board computer can control the fuel injector properly
Regarding the compatibility of fuel injectors with the 2003 Mitsubishi Eclipse 3G, there are a few options mentioned in the forums. It appears that VR4 and DSM injectors (both stock and aftermarket) will fit the Eclipse 3G. Additionally, 850cc injectors that fit 91-99 3000GT VR4 Turbo are mentioned as a possible option, although they may be larger in capacity than needed. It is recommended to consult with experienced mechanics or enthusiasts in Mitsubishi Eclipse 3G forums for specific injector recommendations and installation procedures.
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Frequently asked questions
It is unclear whether all 3G injectors are interchangeable. Some sources suggest that EVO injectors will fit, along with any 1G/2G Eclipse injectors, while others claim that the injector height might be too tall or the bottom might not seal.
Some fuel injectors that fit the Mitsubishi Eclipse 3G include the Diamante and the 4cyl Galant (99-03) 270cc injectors, the 850cc injectors that fit 91-99 3000GT VR4 Turbo, and the 275cc injectors from the Diamante and 4G64 Eclipse.
The stock injector size for the Mitsubishi Eclipse 3G is 210cc for the V6 and 240cc for the 4-cylinder.
The procedure for replacing the fuel injectors on the Mitsubishi Eclipse 3G includes draining the coolant, relieving the fuel pressure, disconnecting the battery, and removing the air intake and throttle body.
