The clue is very much in the name, it’s a device that directly injects petrol or diesel into the combustion chamber. Fuel injectors use electricity to add the precise amount of fuel needed at every engine cycle.
Located on the top of the engine, the tops and fuel pipes are rarely visible without removing the engine covers and other components. They protrude into the engine's cylinders, similar to spark plugs.
Fuel injectors replaced carburettors. Being controlled by the ECU, fuel injection systems allow for more precise fuel delivery, leading to both better fuel economy and more power.
Using a magnetic coil, similar to an electronic valve, fuel is forced through a small orifice, this allows very precise control of both the timing and capacity of the injection process.
What causes fuel injectors to fail?
Fuel Injectors are complex and intricate components, there are a few ways an injector can become defective, most commonly either due to contaminant buildup or seals ageing and cracking.
Fuel contains trace elements of impurities such as carbon, these can get trapped inside the injector over time, and cause issues preventing the injector from opening or closing, both resulting in running problems.
Time is not kind to any component with rubber seals, these will gradually dry out and begin to be less effective. Injectors have multiple seals, inside and sealing to the engine, and they can begin to leak over time.
Poor fuel filtration
Cars are fitted with a fuel filter, which stops any larger particles that may have been transferred into the liquid through transport and storage.
If your filter is particularly old or of inferior quality, it may allow more contaminants to enter the fuel system. The fuel injectors will always respond poorly to fuel with contaminants.
How long do fuel injectors last?
Typically fuel injectors should last between 60,000 and 100,000 miles. This may be less if the car has been left unused for large periods of time because the seals in the injectors will age faster if not used.
To Fit:
4395cc 330KW 449HP N63 B44 B
BMW 5 Series Petrol Hatch AWD -- F07 550i xDrive 2012 - 2017
4395cc 330KW 449HP N63 B44 B
BMW 5 Series Petrol Hatch RWD -- F07 550i 2012 - 2017
4395cc 330KW 449HP N63 B44 A;N63 B44 B
BMW 5 Series Petrol Saloon AWD -- F10 550i xDrive 2013 - 2016
4395cc 330KW 449HP N63 B44 B
BMW 5 Series Petrol Saloon RWD -- F10 550i 2013 - 2016
4395cc 330KW 449HP N63 B44 B
BMW 5 Series Petrol Saloon RWD -- F10 M5 30th Anniversary 2014 - 2016
4395cc 441KW 600HP S63 B44 B
BMW 5 Series Petrol Saloon RWD -- F10 M5 Competition 2013 - 2016
4395cc 423KW 575HP S63 B44 B
BMW 5 Series Petrol Saloon RWD -- F10 M5 2011 - 2016
4395cc 412KW 560HP S63 B44 B
BMW 6 Series Petrol Convertible AWD -- F12 650i xDrive 2012 - 2018
4395cc 330KW 449HP N63 B44 A;N63 B44 B
BMW 6 Series Petrol Convertible RWD -- F12 650i 2012 - 2018
4395cc 330KW 449HP N63 B44 A;N63 B44 B
BMW 6 Series Petrol Convertible RWD -- F12 M6 Competition 2015 - 2018
4395cc 441KW 600HP S63 B44 B
BMW 6 Series Petrol Convertible RWD -- F12 M6 2012 - 2018
4395cc 412KW 560HP S63 B44 B
BMW 6 Series Petrol Coupe AWD -- F06 650i xDrive 2012 - 2018
4395cc 330KW 449HP N63 B44 B
BMW 6 Series Petrol Coupe AWD -- F13 650i xDrive 2012 - 2017
4395cc 330KW 449HP N63 B44 B
BMW 6 Series Petrol Coupe RWD -- F06 650i 2012 - 2018
4395cc 330KW 449HP N63 B44 B
BMW 6 Series Petrol Coupe RWD -- F06 M6 Competition 2015 - 2018
4395cc 441KW 600HP S63 B44 B
BMW 6 Series Petrol Coupe RWD -- F06 M6 2013 - 2018
4395cc 412KW 560HP S63 B44 B
BMW 6 Series Petrol Coupe RWD -- F13 650i 2012 - 2017
4395cc 330KW 449HP N63 B44 B
BMW 6 Series Petrol Coupe RWD -- F13 M6 Competition 2015 - 2017
4395cc 441KW 600HP S63 B44 B
BMW 6 Series Petrol Coupe RWD -- F13 M6 2012 - 2017
4395cc 412KW 560HP S63 B44 B
BMW 7 Series Petrol Saloon AWD -- F01,F02,F03,F04 750i, Li xDrive 2012 - 2015
4395cc 330KW 449HP N63 B44 B
BMW 7 Series Petrol Saloon RWD -- F01,F02,F03,F04 750i, Li 2012 - 2015
4395cc 330KW 449HP N63 B44 B
BMW X5 Petrol SUV AWD -- F15,F85 50i xDrive 2013 - 2018
4395cc 330KW 449HP N63 B44 B
BMW X5 Petrol SUV AWD -- F15,F85 M 2014 - 2018
4395cc 423KW 575HP S63 B44 B
BMW X6 Petrol SUV AWD -- F16,F86 50i xDrive 2014 - 2019
4395cc 330KW 449HP N63 B44 B
BMW X6 Petrol SUV AWD -- F16,F86 M 2014 - 2019
4395cc 423KW 575HP S63 B44 B
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