Katerina Swanson
If you notice any fuel odour around your 2009 Lincoln MKZ, you may have a leaking fuel injector. Fuel injectors are usually connected to a fuel rail located on top of the engine and supplied with fuel under pressure from the fuel pump in the fuel tank. A leaking fuel injector can be dangerous and should be serviced or replaced. You can either do this yourself or opt for a professional injector service facility to clean each injector ultrasonically and replace the filters.
| Characteristics | Values |
|---|---|
| Fuel Injector Kit | Fuel filter replacement recommended |
| Fuel Injector | 6 per car |
| Fuel Injector Replacement Costs | $4,999 - $8,899 |
| Fuel Injector Leak | Odor of raw gas or visible leaks |
| Fuel Injector Failure | Check engine light |
| Fuel Injector Servicing | Ultrasonic cleaning and replacement of internal filters |
| Fuel Injector Part Number | 0280158091 62399 |
| Fuel Injector Compatibility | Lincoln MKS, MKT, MKX, MKZ Edge, Mazda Mercury |
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What You'll Learn
Check for fuel leaks
Checking for fuel leaks in your 2009 Lincoln MKZ is a crucial step to ensure the proper functioning of your vehicle and prevent potential safety hazards. Here is a detailed guide on how to check for fuel leaks:
Initial Inspection:
Before performing any tests or checks, it is essential to inspect the fuel injectors for any signs of leakage. Physically examine the exterior body of the fuel injector and the area near the fuel rail. If you notice any traces of gasoline or observe a strong gasoline odour, it is a clear indication of a leaking fuel injector.
Check Engine Light:
If you suspect a leaking fuel injector, the first step is to refrain from starting your vehicle. Leaking fuel injectors pose a fire hazard. Instead, observe the check engine light on the dashboard. A faulty fuel injector, such as one with a faulty solenoid, may cause a trouble code to be set in the PCM (powertrain control module), illuminating the check engine light. This light indicates the need for further diagnostics and potential repairs.
Engine Performance Issues:
A leaking fuel injector can cause various engine performance issues. Pay attention to rough idling, loss of power, or misfiring. These problems could be indicative of faults in the fuel injection system, including the fuel injectors. Incomplete fuel combustion due to leaking injectors can also lead to increased emissions and, in severe cases, damage the catalytic converter.
Multimeter Testing:
While a multimeter test primarily assesses the electrical functioning of the fuel injectors, it can also provide insights into potential leaks. Before performing electrical tests, ensure that you have inspected the fuel injectors for leaks, as mentioned in the previous steps. If no leaks are apparent, proceed with the multimeter testing as described in the general guide on testing injector wiring.
Replacement and Prevention:
If you determine that your 2009 Lincoln MKZ has a leaking fuel injector, it is essential to replace it. Before installing a new injector, dip the spraying tip in engine oil to prevent leaks. Additionally, consider regular cleaning and maintenance of your fuel injectors to prevent leakage. Servicing your fuel injectors off-the-car is more effective, as it allows for the replacement of internal filter baskets, ensuring optimal performance and reducing the likelihood of leaks.
Remember, dealing with fuel leaks can be hazardous, and it is always recommended to seek professional assistance if you are unsure about any aspect of the process.
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Check engine light
A flashing check engine light on your 2009 Lincoln MKZ is a serious issue that should not be ignored. The most common cause of this issue is a misfire, which can be due to a fuel issue, a timing issue, or bad ignition components. When your engine is misfiring, it dumps raw fuel into the exhaust, which can detonate and cause damage to the catalytic converter and the exhaust system. Therefore, it is recommended that you do not drive your vehicle until you diagnose and fix the issue.
A faulty mass airflow sensor can also cause the check engine light to come on. This part directs the computer in your vehicle to add the correct amount of fuel based on the air coming through the engine. When this sensor starts to fail, the car will stall, idle poorly, emissions will increase, and your gas mileage will decrease. An air filter that has never been replaced or is improperly installed can sometimes be the culprit.
A faulty oxygen sensor can also be the reason for the check engine light coming on. An oxygen sensor monitors the exhaust for unburned oxygen, which indicates engine efficacy and the proper air-to-fuel ratio. If you have a faulty sensor, it will not provide the correct data to the onboard computer, which can eventually damage your catalytic converter.
Other potential causes of a flashing check engine light include a faulty fuel injector, a loose or damaged gas cap, and bad spark plugs and wires. It is important to have a mechanic diagnose and address the issue as soon as possible to avoid further damage to your vehicle.
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Deposits and imbalances
Fuel injectors will inevitably accumulate deposits as mileage increases. These deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. This imbalance can lead to engine problems such as rough idling, loss of power, or misfiring. Therefore, it is important to regularly service the injectors to prevent or address these issues.
Servicing the injectors typically involves removing them from the car. Once the engine is cold, the pressure within the fuel rail is relieved by briefly running the engine with the fuel pump fuse removed. The upper plenum on the intake manifold, along with any cables, hoses, or wiring that obstructs access, is then removed. The supply and return lines are disconnected from the fuel rail, and the electrical connectors to each injector are unlocked and detached. Subsequently, the fuel rail is unbolted and removed from the intake manifold.
The injector requiring replacement is taken out from the fuel rail, being cautious to prevent any debris from entering the exposed openings. An O-ring seal typically secures the injector tightly in a finely polished bore within the fuel rail. A new O-ring is used to reinstall the serviced or replaced injector into the fuel rail, with engine oil applied to the O-ring to avoid any damage. After reinstalling the fuel rail and reconnecting the supply and return lines, the plenum and associated cables, hoses, or wiring are put back in place. Finally, the engine is started, carefully checked for leaks, and road-tested.
To clean the injectors, a professional injector service facility will use ultrasonic cleaning methods and replace the tiny internal filter baskets for a relatively low cost. Alternatively, off-the-car cleaning can be performed, which is more effective than on-the-car cleaning due to the injectors' internal filter baskets. Using high-quality (Tier One) gasoline can help reduce deposits and extend the life of the fuel injectors.
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Cleaning the injectors
To clean the fuel injectors of your 2009 Lincoln MKZ, you can follow these steps:
Step 1: Choose a Fuel Injector Cleaner
Select a fuel injector cleaning chemical that contains concentrated detergents or polybutene amine (PBA) chemistry. These products are designed to break up and remove the minerals that clog the tiny nozzles on fuel injectors.
Step 2: Prepare the Fuel Tank
Ensure your fuel tank is not completely empty before adding the cleaner. Refer to your vehicle's specifications to determine the tank's capacity and add enough fuel to meet the requirements of the cleaning product. For example, if your car has a 15-gallon tank and is half full, you have 7.5 gallons of fuel.
Step 3: Add the Fuel Injector Cleaner
Pour the fuel injector cleaner into the gas tank as per the manufacturer's instructions. Do not add the cleaner to a tank with low fuel, as this can cause sediment to loosen and clog the injectors. The detergents will clean the injectors as you drive.
Step 4: Monitor Performance
After using the fuel additive, pay attention to any persisting issues such as sputtering and knocks. If these problems persist, consult a certified mechanic. The injectors may require professional pressure cleaning or there may be another issue with the engine.
It is important to note that on-the-car cleaning of fuel injectors may be less effective than off-the-car cleaning. This is because the injectors have tiny internal filter baskets that should be replaced or cleaned separately. A professional injector service facility can clean each injector ultrasonically and replace these filters at a relatively low cost.
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Replacing the injectors
Before attempting to replace the injectors, it is important to confirm that they are the source of the problem. Poor engine operation can have many causes, but faults in the fuel injection system are a common possibility. Signs of a faulty fuel injector include a rough idle, loss of power, or misfiring. If you notice any fuel odour around your car, a leaking fuel injector may be the culprit. In this case, do not start your car due to the fire hazard. The check engine light may also indicate a fuel injection failure, such as a faulty solenoid, which can cause a trouble code to be set in the PCM (powertrain control module).
Once it has been determined that the fuel injectors need to be replaced, the process typically involves the following steps:
- Disconnect the battery to ensure proper safety precautions against fire.
- Drain the coolant and oil, if necessary. Some cars have plastic intake manifolds that do not have oil or coolant passages, making this step unnecessary.
- Remove the necessary engine components to access the fuel injectors. This may include the intake manifold, fuel rail, and any cables, hoses, or wiring that restricts access.
- Disconnect the fuel injector from the fuel rail and electrical connector.
- Remove the fuel injector by relieving the pressure within the fuel rail. This can be done by briefly running the engine with the fuel pump fuse out once the engine is cold.
- Install the new fuel injector in its place, ensuring it is securely connected to the fuel rail and electrical connector.
- Reassemble the engine components and reconnect the battery.
The average cost for a Lincoln MKZ Fuel Injector Replacement is between $465 and $586, but prices can vary depending on the specific car and labour rates in your area. It is recommended to use high-quality, OEM (original equipment manufacturer) parts when replacing the injectors to ensure even power across the engine and a proper air-fuel mixture for all cylinders.
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Frequently asked questions
If you notice a fuel odor around your car, it could be a sign of a leaking fuel injector. If you suspect a leak, do not start your car as it could be a fire hazard. Other signs of fuel injector failure include rough idle, loss of power, or misfiring.
There are six fuel injectors per car.
The cost of a fuel injector ranges from $4,999 to $8,899.
Fuel injectors for a 2009 Lincoln MKZ can be purchased from online retailers such as Amazon and AutoZone.
To check the fuel injector wires, you will need to refer to a repair manual or seek assistance from a professional mechanic. They will be able to provide guidance on properly accessing and inspecting the fuel injector wires.
