Vehicle Compatibility Information
2004 For Ford Explorer 4.0L
2004 For Ford Explorer Sport Trac 4.0L
2004 For Mercury Mountaineer 4.0L
SYMPTOMS OF A FAULTY FUEL INJECTOR
!Rough idling & stalling. The vehicle might shake and stall when idling if it is not getting enough fuel in the combustion chambers.
!The engine misfires. Often caused by dirty or clogged fuel injectors.
!A fuel smell. You might smell a strong fuel odour in and around your car if there is a leak or the injectors are releasing too much fuel.
!Starting difficulties. When too much or too little fuel is being supplied this can prevent the engine from starting and lead to engine failure.
!Increased fuel consumption.
!The check engine light is on.
!Black or grey smoke. Black smoke is an indication that the air-fuel mixture is too rich. You can diagnose many different car problems by the colour of the exhaust gases. Read more about it here.
How to Replace Fuel Injectors
A quick disclaimer: This job might not be that tricky for most run-of-the-mill gas engines, but diesel is another story altogether. While gasoline is injected into the engine under relatively low pressure, diesel is often flowing through the system at pressures as high as 20,000 PSI. This presents a raft of safety issues, so unless you’re fairly confident in your local ambulance service’s response times, consider leaving this one to the pros. Some gas engines might also be a hassle depending on how the engine compartment is laid out and how many components you’ll have to remove to get to the fuel injectors themselves. So, make sure you know what you’re getting into before you get to work.
1. The first step in replacing a fuel injector is to relieve the pressure in the fuel system itself. Skipping this step could result in a messy and dangerous project, so refer to your vehicle’s owner’s manual for specific instructions on how to depressurize the fuel system. If the vehicle has been on recently, allow the engine to cool, then locate the fuel pump fuse or the relay that controls the fuel pump. Don’t pull it just yet; start the engine and disconnect the fuse. If all goes well, the engine should sputter out due to a lack of pressurized fuel.
2. Many fuel injection systems use a centralized fuel rail to route fuel to each individual injector. This will have to be removed to get to the injectors themselves, so disconnect the main fuel line feeding into the rail. Some systems will have fuel lines at each end of the rail and they’ll both need to be removed in order to proceed. Once this is done, simply remove the bolts or screws and the rail should pop right off. Some vehicles will have an individual fuel line feeding into each injector, which you can remove one by one.
3. With the tops of the fuel injectors exposed, it’s now time to remove the wiring harness connected to each injector. In some cases, the wiring will be located on top of the fuel rail itself and should be removed before disconnecting the rail. These harnesses are usually held on by little more than a single spring, which you can pry out with a flathead screwdriver or similar implement. Make sure to hold onto this small metal spring, as it’s all too easy to misplace.
4. Now you’re ready to get pulling. Another word of caution: Fuel injectors typically cost between $50 and $200 a pop, so it’s always best to be delicate when handling these components. Of course, in the case of a replacement, the fuel injector you’re pulling is already damaged or broken, but in case you misdiagnosed the specific injector that needed replacing, you don’t want to end up ruining a perfectly good part. It’s also possible for a fragile part of the injector to break off and become lodged in the cylinder should you remove it in too much of a rush, so I’d preach caution here.
5. After the fuel injector is removed, installation is a walk in the park. Simply lubricate the seals on the new injector, replace it in the same hole you took it out of, and reconnect the wiring harness. Reattach the fuel rail or individual fuel lines, bolt everything down, and replace the fuel pump fuse. Once you start up the vehicle, the fuel system should repressurize itself. With any luck, the engine will be purring like a cat in a sunbeam.
Noticed
-Instruction is not included. Professional installation is recommended
-Accessories: You will get exactly showing in the picture
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