Mercedes Mullins
The Infiniti G35 is a car that has been around since at least 2003, with models from 2004 and 2005 also being referenced. Fuel injectors in the G35 have been a common issue, with some forum users noting that they have had to replace their fuel injectors multiple times. This has sparked debate about whether it is necessary to replace all fuel injectors at once, as recommended by Infiniti, or whether it is possible to simply replace the faulty injector. Some users have also noted that cleaning the fuel injectors and throttle bodies can help with issues such as high idle. While some people opt to take their G35 to a mechanic, others attempt to replace or clean their fuel injectors themselves, with some noting that it is a time-consuming process.
G35 Fuel Injector: Characteristics and Values
| Characteristics | Values |
|---|---|
| Difficulty of Installation | The hardest part is removing the intake plenum. Once the plenum is removed, the injectors are easily accessible. |
| Replacement | It is recommended to replace all fuel injectors at once to ensure proper resistance is maintained. |
| Cleaning | Fuel injectors can be cleaned manually with a fine brush and an electrical cleaner, such as Mass Air Flow Sensor cleaner. |
| Troubleshooting | Issues with fuel injectors can be caused by clogged injectors, faulty fuel filters, or corrosion in the coil-pack harness. |
| Tuning | Larger injectors may require tuning the car's settings, such as creating a base fuel map and adjusting fuel trim. |
| Installation Process | The process involves removing the intake, upper/lower plenum, and fuel rail. Disconnect the fuel line and unbolt the injector rail to access the injector for replacement. |
| Precautions | Keep track of bolts, cover cylinders when working with the plenum off, and know your torque specs/pattern. |
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What You'll Learn
Removing the plenum
Once you have removed the top part of the intake plenum, you can proceed to remove the lower part. The fuel injectors will be located right underneath. Before attempting any work on the fuel injectors, be sure to disconnect the fuel line for safety.
It is worth noting that some sources suggest cleaning the fuel injectors and throttle body manually with a fine brush and an appropriate cleaner. However, it is important to use an electrical cleaner, as throttle chamber cleaner, brake clean, or carb cleaner may be too harsh for the electronics.
Aftermarket injector options are also available, and some people may choose to upsize their injectors when installing a supercharger. It is important to ensure that your car can be tuned for larger injectors.
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Disconnecting the fuel line
First, locate the fuel line. It is usually connected to the fuel injector rail, which is typically found near the engine. Once you have located the fuel line, you will need to prepare the necessary tools and safety equipment. This includes eye protection, gloves, and a suitable container to catch any spilled fuel. It is also recommended to have some rags or paper towels nearby to wipe up any spills or leaks.
Next, you will need to relieve the pressure in the fuel system. This is an important safety step to prevent fuel spray or leakage during the disconnection process. Refer to your vehicle's repair manual or seek advice from a qualified mechanic to ensure this step is performed correctly. Once the pressure is relieved, you can proceed to disconnect the fuel line.
Use the appropriate tools to carefully loosen and remove the fuel line from the injector rail. Be cautious as the fuel line may still contain some fuel, and always have a container ready to catch any spills. It is also important to note that different vehicles may have specific connection types for their fuel lines, such as quick-disconnect fittings or clamps. Ensure you are familiar with your vehicle's specific setup before proceeding.
After successfully disconnecting the fuel line, it is crucial to cap or plug the open end to prevent any fuel leakage and avoid introducing contaminants into the fuel system. Additionally, properly dispose of any spilled fuel according to local regulations and safety guidelines.
By carefully following these steps, you can successfully disconnect the fuel line during the process of rebuilding or replacing your G35 fuel injector. Remember to prioritize safety and refer to vehicle-specific instructions or seek expert advice whenever needed.
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Unbolting the injector rail
To begin the process of unbolting the injector rail, you must first remove the intake plenum. This can be a challenging step, as it requires careful manoeuvring and a significant amount of time. Once the top part of the intake plenum is removed, proceed to take off the lower section.
With the intake plenum successfully detached, the fuel injectors will be exposed and within reach. Before proceeding, ensure that you have disconnected the fuel line, a crucial step for safety and practicality.
Now, you can focus on unbolting the injector rail. This step will grant you access to the individual injectors for further maintenance or replacement. It is important to keep track of the bolts during this process, as they will need to be reinstalled in the correct order and with the appropriate torque specifications.
As you work on unbolting the injector rail, be mindful of any debris or residue that may have accumulated. Cover your cylinders to prevent any foreign objects from falling into the engine, which could cause issues during reassembly.
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Cleaning the fuel injectors
Firstly, you need to access the fuel injectors. To do this, remove the intake plenum, which can be challenging. Once the top part of the intake plenum is off, remove the lower part to expose the injectors. Be cautious and take your time during this step, as it involves delicate engine parts.
After accessing the fuel injectors, disconnect the fuel line and unbolt the injector rail. This step will allow you to remove the injectors for cleaning. It is important to keep track of the bolts and cover the cylinders during this process.
Now, you can start cleaning the fuel injectors. One method is to use a fuel injector cleaning solution like BerryMan. Pour the cleaner into a metal container and let the injectors soak for a few hours. Ensure you keep the electronics dry during this process. Alternatively, you can use a specialised electrical cleaner, such as Mass Air Flow Sensor cleaner, as recommended by a Nissan technician. Avoid using harsh chemicals like throttle chamber cleaner, brake cleaner, or carb cleaner, as they can damage the electronics.
If you prefer a more unconventional approach, you can try soaking the injectors in a cup of Coca-Cola for a few hours. Some people have reported success with this method.
Finally, after cleaning and allowing the injectors to dry, you can reinstall them. Make sure to follow the proper torque specs and patterns when reinstalling the injectors and the intake plenum.
It is important to note that some people argue that cleaning fuel injectors at home is ineffective, and it might be better to seek professional cleaning services or consider replacement if the injectors are severely clogged or damaged.
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Replacing the fuel injectors
Before starting the replacement process, it is important to note that fuel injectors rarely need to be replaced compared to other vehicle systems. If your vehicle is accelerating strangely or you are experiencing poor fuel mileage, the issue is more likely related to the fuel pump, fuel filter, engine oil, or differential.
If you notice any fuel leaks, do not continue to drive the vehicle as the gas could catch fire. Have your vehicle inspected and repaired by a mechanic.
Now, here is a step-by-step guide on how to replace the fuel injectors:
Step 1: Prepare the Vehicle
Start with a cold engine, and disconnect the battery to ensure no power is running through the system. Remove the plastic engine covers using the appropriate socket, and set them aside.
Step 2: Access the Fuel Injectors
To access the fuel injectors, you will need to remove the intake plenum, which is often the most challenging part of the process. You may also need to remove the upper and lower plenum to reach the fuel rail and injectors. Be sure to track your bolts and cover your cylinders during this process.
Step 3: Disconnect the Fuel Rail
The fuel injectors are connected to the fuel rail, which delivers fuel to them. Disconnect the main fuel line at the end of the rail, and remove any additional lines. The fuel rail is typically held in place by screws or bolts, which you will need to remove. If your wiring travels over the top of the rail, disconnect it before removing the rail.
Step 4: Remove the Fuel Injectors
Each injector has a plug that connects to the wiring harness, which you will need to disconnect using a flat-head screwdriver. Gently wiggle and pry the injectors out of the fuel rail. They may require a bit of force to remove, but be careful not to damage any components. Take a picture of the orientation and direction of each injector for reference during installation.
Step 5: Install the New Fuel Injectors
Purchase fuel injectors designed specifically for your engine. Before installing, dip the injector tips into a small amount of engine oil or gasoline to wet the seals and prevent leaks. Press each injector into the rail until it stops, and secure it with the metal clip, if applicable.
Step 6: Reattach the Fuel Rail and Test
Line up the injectors over their respective holes, and press them into place. Bolt down the fuel rail and reattach the fuel line. Reconnect the battery, turn the key to the "on" position, and wait 10 seconds before starting the engine. This will allow the fuel pump to refill the lines and rails. After the engine reaches normal idle RPM, turn it off.
Finally, check all the injectors for fuel leaks with a flashlight.
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Frequently asked questions
To rebuild a G35 fuel injector, you must first remove the intake plenum. Once the top part of the intake plenum is off, the lower part can be removed, revealing the injectors. Disconnect the fuel line and unbolt the injector rail to access the injector you want to replace.
It is important to keep track of your bolts and cover your cylinders when working with the plenum off. You should also know your torque specs/pattern. Check your valve covers and spark wells for oil, as these are common maintenance issues.
You can clean the fuel injector manually with a fine brush and an electrical cleaner, such as Mass Air Flow Sensor cleaner. Throttle Chamber cleaner, Brake Clean, and Carb Cleaner are not suitable as their chemicals are too harsh for the electronics.
