Regan Brown
Replacing the fuel injectors on a 2007 BMW 335i is a complex task that should be left to professionals due to the risk of fire and other complications. Fuel injectors regulate the amount of pressurised fuel used for each engine cycle and tend to fail after 80,000 miles. Signs of a faulty fuel injector include a strong fuel odour, engine misfires, and the check engine light turning on.
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What You'll Learn
Fuel injector problems and symptoms
Fuel injectors regulate the amount of pressurised fuel used for each engine cycle. When a fuel injector fails or clogs, engine power is reduced and the engine may stall. Faults in the fuel injection system are a common cause of poor engine operation.
A faulty or dirty fuel injector will soon starve your engine of the fuel it needs to run. When the ratio of air and fuel in your engine is off, your motor may not generate the combustion it needs to operate. This can lead to engine failure and your car may not start.
A bad injector can cause at least one cylinder to be starved of fuel, which will cause the engine to rapidly lose power. You may find it hard to accelerate or your engine might struggle on uphill roads. The engine will stutter and judder as it misses revolutions. A healthy Porsche engine generates a smooth, even purr or rumble when idling, but a failing injector will cause the engine to idle roughly, sputtering and shaking. If one or more injectors stop working, your engine is likely to stall when you slow down and pause.
A malfunctioning injector can unbalance the fuel-air mixture, causing misfiring. The engine's RPMs will become erratic and the needle on your dashboard's RPM gauge will dance in a volatile way. Your dashboard will also warn you with the check engine light.
Other signs of a bad fuel injector include a strong odour of raw gas or visible leaks. Fuel injectors should not leak fuel into the intake manifold when the car is off. If you notice any fuel odour around your car, the possibility of a leaking fuel injector should be considered.
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Fuel injector replacement cost
The cost of replacing fuel injectors can vary depending on several factors, such as the make and model of your vehicle, its age, the severity of the issue, and your location. The cost of parts and labour for the replacement typically ranges from $150 to $400, while the average total cost can be anywhere from $500 to $2,500.
For a BMW 335i, the average cost of fuel injector replacement is between $1,339 and $1,482, but this can vary from car to car. Fuel injectors tend to fail after 80,000 miles and require little maintenance. However, it is important to keep them clean and functioning properly to avoid problems with the engine, such as reduced engine power, misfires, and stalling.
Some signs that your fuel injectors may need replacement include an odour of raw gas or visible leaks, decreased fuel economy, and increased fuel consumption. If you suspect an issue with your fuel injectors, it is recommended to have them inspected and serviced by a qualified mechanic to avoid further engine damage and ensure the job is done correctly.
To save money, you may consider purchasing refurbished or remanufactured fuel injectors, which can be more affordable than new ones while still being reliable and effective. Additionally, shopping around for multiple quotes and comparing prices can help you find the best deal without sacrificing quality.
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Fuel injector replacement process
Fuel injector replacement is a large job that may involve draining the coolant and oil, removing many engine components, and replacing the intake manifold gasket. Some cars, however, are designed with plastic intake manifolds that do not have oil or coolant passages, making this process easier.
Firstly, a visual inspection should be conducted to identify the issue. If the problem is unclear, a computerized scanner can be connected to the vehicle to read its sensors. If there is a fuel injector problem, misfires are likely to be happening frequently on one cylinder. The fuel injector in question must be tested and may need to be removed for bench testing.
Once the faulty injector has been identified, the replacement process can begin. The injector is disconnected from the fuel rail and electrical connector and removed. The new injector is then installed in its place. It is important to use high-quality, OEM parts to ensure even power across the engine and a proper air-fuel mixture for all cylinders.
When working with fuel, the battery should be disconnected, and proper precautions should be taken against fire. This is not a DIY job and should be left to a professional. The risk of fire is significant, and the repair process can be very complicated.
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Fuel injector maintenance
Fuel injectors regulate the amount of pressurised fuel used for each engine cycle. They are fuel metering devices that spray atomised droplets of fuel in a specific pattern into the engine's intake manifold or directly into the combustion chamber.
Fuel injectors require little maintenance and tend to fail after 80,000 miles. To prolong the life of the fuel injectors, follow the scheduled maintenance and cleaning of the fuel delivery system and injectors.
Signs of a Faulty Fuel Injector
- The check engine light will be on.
- The engine may stall immediately after starting, fail to start, hesitate under throttle, or vibrate roughly.
- There may be an odour of raw gas or visible leaks.
- The engine may idle roughly or stall.
- You may burn more gas and get worse fuel economy.
Cleaning Fuel Injectors
Fuel injectors can be cleaned without removing them. This can be done by pouring a cleaning solvent into a pressure canister and attaching a compressed air line. However, removing the injectors from the engine allows you to thoroughly remove gunk and carbon buildup.
Replacement
Replacement should be left to a professional due to the risk of fire and the complexity of the repair. The average cost for a BMW 335i Fuel Injector replacement is between $1,339 and $1,482.
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Fuel injector parts and compatibility
Fuel injectors regulate the amount of pressurised fuel used for each engine cycle. They are usually connected to a fuel rail located on top of the engine and supplied with fuel under pressure from the fuel pump. When the vehicle's computer sends a signal to the fuel injectors, they spray fuel into the engine's intake manifold or directly into the combustion chamber.
When replacing the fuel injectors on a 2007 BMW 335i, it is important to use high-quality, OEM parts. Keeping the injectors the same will ensure even power across the engine and a proper air-fuel mixture for all cylinders. This should result in a smooth-running engine.
BMW 335i fuel injectors are available from a variety of manufacturers, including Bosch, Delphi, and GB Remanufacturing. When purchasing a replacement fuel injector, it is important to verify your BMW's injector EU# and index number before ordering. For example, a replacement high-pressure fuel injector for the BMW 335i is available from FCP Euro, which includes a sealing o-ring but does not include a decoupling element. It is an EU5 injector, and the part number is 13538616079, with "-12" printed on the body of the injector to denote index 12 as the latest revision.
Additionally, when replacing fuel injectors, it is important to consider the internal filter baskets, which should be replaced as part of the servicing process. The entire bank of injectors may need to be replaced, and any new injectors will need to be programmed.
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Frequently asked questions
There are several signs that your fuel injectors need replacing. You might notice a loss of power, rough idle, or misfiring. If you notice an odor of raw gas or visible leaks, this could be a sign of a leaking fuel injector. If the check engine light comes on, this could be due to a faulty solenoid.
Fuel injectors tend to fail after 80,000 miles and require little maintenance. To prolong their lifespan, follow the scheduled maintenance schedule for cleaning the fuel delivery system and injectors.
The cost of replacing fuel injectors on a BMW 335i ranges from $800 to $1,482, depending on the car.
No, this is not a DIY job. Fuel injector replacement should be left to a professional due to the risk of fire and the complexity of the repair.
