Regan Brown
The Ford Flex is a car that has been in production since at least 2011. Fuel injectors are a key component of the car's engine, and there are two types of fuel injectors for this model: MOTORCRAFT CM5199 and MOTORCRAFT CM5248. The number of fuel injectors in a Ford Flex depends on the model year and engine configuration. For example, the 2017 and newer models with the Ecoboost engine have dual fuel injectors, while other models may have a single injector per cylinder. Fuel injectors can be serviced or replaced, and the cost of replacement ranges from $238 to $301 on average.
| Characteristics | Values |
|---|---|
| Number of Fuel Injectors | 6 |
| Fuel Injector Replacement Cost | $238 to $301 |
| Fuel Injector Type | Direct Fuel Injector |
| Fuel Injector Function | Regulate the amount of pressurized fuel used for each engine cycle |
| Fuel Injector Cleaning | Specialized cleaning equipment required |
| Fuel Injector Testing | Computerized scanner, removal for bench testing |
| Fuel Injector Repair | Serviced once removed from the car or replaced with new injectors |
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What You'll Learn
Fuel injector replacement costs
The fuel injector is a fuel metering device that sprays atomized droplets of fuel in a specific pattern into the engine's intake manifold or directly into the combustion chamber. Each time an intake stroke occurs in the engine, the vehicle's computer sends a signal to the fuel injectors, requesting they spray fuel. When a fuel injector fails or clogs, engine power is reduced and misfires occur. 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.
The average cost for a Ford Flex Fuel Injector Replacement is between $238 and $301, but this can vary from car to car and does not include taxes and fees. Labor costs are estimated between $158 and $200 while parts are priced between $80 and $101.
The injector(s) requiring replacement are removed from the fuel rail, taking care to not allow any debris to enter the exposed openings. The fuel rail is then re-installed, and the supply and return lines are re-connected. Finally, the engine is run, and there is a careful check for leaks, and the vehicle is road-tested.
It is not recommended to drive a vehicle with a fuel injector problem. These issues can cause the car to stall every few moments and accelerate unpredictably, creating a hazard. If the problem is bad enough, the vehicle may not even start, making it impossible to drive. Fuel injector replacement should be left to a professional. The risk of fire is enough by itself, but this repair can also get very complicated.
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Fuel injector cleaning
The Ford Flex has six cylinders, and there is one fuel injector per cylinder. Fuel injectors regulate the amount of pressurised fuel used for each engine cycle. When the engine is idling, the fuel spraying duration is shorter than during heavy acceleration.
Fuel injectors will develop deposits over time, and these deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. If you notice a fuel odour around your car, a leaking fuel injector could be the cause. However, there should be no external leaks from a fuel injector. If an external leak is suspected, do not start your car due to the fire hazard.
It is recommended to service the injectors when the engine is already disassembled or when installing a new one. Fuel injectors can be serviced once removed from the car or replaced with new injectors. On-the-car cleaning of fuel injectors is not as effective as off-the-car cleaning because injectors have tiny internal filter baskets that should be replaced as part of the servicing process.
To remove the fuel injector, first relieve the pressure within the fuel rail by briefly running the engine with the fuel pump fuse out. Then, remove the upper plenum on the intake manifold, along with any cables, hoses, or wiring that restricts access. The supply and return lines are then removed from the fuel rail, followed by the electrical connectors to each fuel injector. Finally, the fuel rail is unbolted and removed from the intake manifold, and the injector(s) requiring replacement or servicing are removed from the fuel rail.
Some Ford Flex owners have suggested using Seafoam or Techron fuel additives every 20,000 miles to keep the fuel injectors clean and maintain smooth engine performance. However, others have expressed scepticism about the effectiveness of fuel injector cleaning services offered by dealers.
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Fuel injector removal
The Ford Flex has two types of fuel injectors, and you will need to check the build date of your Flex to see which type you need. The first type is for models built before 8/30/10, and the part number is MOTORCRAFT CM5199 {#AA5Z9F593D, CM5163}. The second type is for models built from 8/30/10 onwards, and the part number is MOTORCRAFT CM5248 {#BA5Z9F593B, CM5204}.
A fuel injector is a device that sprays atomized droplets of fuel into the engine's intake manifold or directly into the combustion chamber. It is connected to a fuel rail located on top of the engine, which is supplied with fuel under pressure from the fuel pump in the fuel tank. When the fuel injector fails or clogs, engine power is reduced, and the engine may stall or fail to start.
To remove a fuel injector from a Ford Flex, the following steps are typically recommended:
First, depressurize the fuel rail by briefly running the engine with the fuel pump fuse out or by starting the car and pulling the fuel pump relay until the car dies. This will relieve the pressure within the fuel rail. Next, drain the coolant by turning the coolant drain plug located on the driver's side at the bottom of the radiator. Remove the upper plenum on the intake manifold, along with any cables, hoses, or wiring that may restrict access. Cut the zip ties holding the wires to the rail.
Then, remove the supply and return lines from the fuel rail, as well as the electrical connectors to each fuel injector. Unlock and remove the electrical connectors to the fuel injectors. The fuel rail can then be unbolted and removed from the intake manifold. Finally, remove the injector(s) requiring replacement from the fuel rail, being careful not to allow any debris to enter the exposed openings. It is recommended to use a special injector puller tool for this step.
It is important to note that fuel injectors have tiny internal filter baskets that should be replaced as part of the servicing process. On-car cleaning of fuel injectors is not as effective as off-the-car cleaning, and specialized cleaning and test equipment may be required.
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Fuel injector types
The Ford Flex is equipped with a direct fuel injection system. This type of fuel injection system focuses on placing the injector inside each cylinder to directly inject the fuel, bypassing the intake valve or manifold. Direct injection takes the fuel injection concept to its limit, injecting fuel directly into the combustion chambers, past the valves.
There are four main types of fuel injection systems:
Single-Point Fuel Injection
The earliest and simplest type of fuel injection, single-point injection, replaces the carburettor with one or two fuel-injector nozzles in the throttle body. This is the oldest form of fuel injection and is also known as throttle body injection (TBI). It is less precise than other systems but meters fuel with better control than a carburettor and is less expensive and easier to service.
Multi-Point Fuel Injection (MPFI)
Also known as port injection, MPFI devotes a separate injector nozzle to each cylinder, right outside its intake port. Every injector sprays fuel at the same time, and each cylinder gets a more precise volume of fuel, with less possibility of fuel condensation outside the intake manifold.
Sequential Fuel Injection (SPFI)
Also called timed injection, SPFI is a type of multiport injection. While basic MPFI employs multiple injectors, they all spray their fuel at the same time or in groups. Sequential fuel injection triggers each injector nozzle independently, spraying fuel immediately before or as their intake valve opens.
Direct Fuel Injection (DI)
Direct fuel injection is more common in diesel engines but is also used in petrol engines, where it is known as GDI (gasoline direct injection). In this system, all the fuel is directly injected into the cylinder, producing maximum fuel economy. Automakers have found that GDI engines are relatively more powerful and convenient for better CNG fuel efficiency.
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Fuel injector problems
Fuel injectors regulate the amount of pressurised fuel used for each engine cycle. There is one injector per cylinder in an engine. Each time an intake stroke occurs in the engine, the vehicle's computer sends a signal to the fuel injectors, requesting they spray fuel. For heavy acceleration, the duration of the fuel spraying will be longer than if the engine were idling.
Fuel injectors can develop several problems over time. One of the most common issues is clogging due to dirt, dust, or residual fuel additives that have built up and turned into a crusty coating due to the heat within the engine. This residue can clog the injectors, impeding the spray of atomized droplets of fuel into the engine's intake manifold.
Another issue is a closed fuel injector, which can occur when rust or faulty windings prevent the valve from opening. If the winding shorts out, overheats, or breaks, or if rust causes the valve to stick, the injector will be unable to deliver fuel. Conversely, an open fuel injector can result from a faulty spring or rust build-up, causing the valve to stick in the open position and leading to a constant fuel supply.
Other problems with fuel injectors include leaks, which can be dangerous as they pose a fire hazard. Additionally, a faulty solenoid within the injector can cause a trouble code to be set in the PCM, illuminating the check engine light.
If you suspect issues with your fuel injectors, it is recommended to seek professional assistance. The repair process can be complicated and risky, especially due to the potential for fire. The average cost for a Ford Flex Fuel Injector replacement is between $238 and $301, but prices can vary depending on the specific vehicle.
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Frequently asked questions
There is one fuel injector per cylinder in a Ford Flex engine.
The cost of replacing a fuel injector in a Ford Flex is between $238 and $301 on average.
There are several signs that may indicate a problem with your Ford Flex's fuel injector, including a rough idle, loss of power, or misfiring. If the fuel injector fails or clogs, the engine power will be reduced and the engine may stall. Another sign is an odor of raw gas or visible leaks around the car. Additionally, you may need to remove and service the fuel injectors as part of major engine repairs or replacements.
