Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2009MOUNTAINEER 4.6 8, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 132 (FUEL CHARGING SYSTEM & FUEL CONTROL SYSTEM)DESCRIPTION AND OPERATIONFUEL CHARGING AND CONTROLS
2009 Mercury Mountaineer 4.6 8, RWD
Fuel Charging and Controls
2009 Mercury Mountaineer 4.6 8, RWDSECTION Fuel Charging and Controls
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The fuel rail:
- delivers fuel to the fuel injectors.
- receives fuel from the fuel supply tube.
CAUTION:
Do not hold the throttle plate open with any object that could scratch the bore or plate while servicing or cleaning the throttle body (TB). Refer to Throttle Body .
The throttle body (TB):
- controls air supply to the upper intake manifold by positioning the throttle plate.
- is not adjustable.
- must be removed from the vehicle to be cleaned.
The fuel injector:
- is electrically operated by the PCM.
- has an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
- atomizes the fuel as the fuel is delivered.
- is deposit resistant.
The fuel rail pressure and temperature sensor:
- measures the pressure and temperature of the fuel in the fuel rail and sends these signals to the PCM.
- uses intake manifold vacuum as a pressure reference. For removal and installation, refer to ELECTRONIC ENGINE CONTROLS article.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.