Fuel Charging and Controls (4.4l) Land Rover Range Rover L322

SPECIFICATIONS

GENERAL SPECIFICATION

FUEL PRESSURES

TORQUE SPECIFICATIONS

Scheme 13

GENERAL

The major components of the fuel charging and control system comprise an intake manifold, a fuel pump, a fuel rail and 8 injectors. The fuel pump supplies fuel from the tank at a constant pressure, via a pipe routed along the side of the transmission, to the fuel rail. The fuel rail distributes the fuel equally to each of the 8 injectors. The fuel injectors, which are controlled by the Engine Control Module (ECM), are installed in the fuel rails on each side of the intake manifold. A cross over pipe connects the 2 fuel rails together at the front of the manifold.

INTAKE MANIFOLD

The intake manifold is located on top of the engine between the 2 cylinder banks and is manufactured from a composite material. The manifold comprises a central chamber with 8 tracts leading to the inlet ports on the engine. The air intake manifold is secured to the cylinder heads via 10 bolts.

Rubber gaskets, located in channels in the intake manifold, seal the joints between the ducts and the cylinder heads.

For additional information, refer to: Intake Air Distribution and Filtering (4.4L)

FUEL PUMP

The submersible electric fuel pump is attached to a carrier and is located at the bottom of the swirl pot inside the fuel tank. The fuel pressure regulator, which controls the fuel pressure in the feed pipe to fuel rail, is located in the fuel manifold in the fuel tank.

For additional information, refer to: Fuel Tank and Lines (4.4L)

THROTTLE BODY

The electronic throttle body controls the engine torque and is located on the air intake manifold. Its main components are, an electronic throttle control valve, Accelerator Pedal Position (APP) sensor and the ECM.

The APP sensor determines the driver demand to control throttle opening. This value is received by the EMS and the throttle is then opened to the correct angle by means of an integral electric motor. Sensors in the throttle body are used to determine the position of the throttle plate and the rate of change in its angle.

For additional information, refer to: Electronic Engine Controls - Description & Operation

INDUCTION ELBOW

The induction elbow provides the interface between the electronic throttle body and the intake manifold. Connections on the induction elbow provide vacuum take off's for various vehicle systems. A boss on the rear of the elbow accommodates the Exhaust Gas Recirculation (EGR) valve.

Scheme 14

Each fuel rail maintains a constant fuel pressure of 4.5bar (65 psi). Four fuel injectors are installed in each injector housing and are connected to the fuel rail. 'O' ring seals are used to seal the injectors in the fuel rails and inlet manifold. A 'Cooper' style fitting is used to connect the fuel jump hose to the LH fuel rail.

A fuel pressure damper is attached to each of the fuel rails.

FUEL PRESSURE DAMPER

A fuel pressure damper is attached centrally to each of the fuel rails. The dampers act to damp pulses from the pump and ensure that the fuel pressure in the rail and to the injectors is constant.

FUEL TEMPERATURE SENSOR

The fuel temperature sensor is located in the rear of the RH fuel rail. The sensor is a NTC sensor, which is connected to the ECM by two wires.

For additional information, refer to: Electronic Engine Controls - Description & Operation

INJECTORS

Eight, top fed, 12-hole, fuel injectors are installed in the fuel rails. Two 'O' rings seal each injector to the manifold interface and should be renewed whenever an injector is refitted to an engine. A small amount of engine oil can be applied to the 'O' rings to aid installation. No other form of lubrication should be used. The fuel jets from the injectors are directed onto the back of the intake valves.

The injectors are electromagnetic solenoid valves controlled by the ECM. Each injector contains a solenoid-operated needle valve, which is closed while the solenoid winding is de-energized. The solenoid winding is connected to a power feed from the main relay and to an earth through the ECM. The ECM switches the earth to control the opening and closing of the needle valve. While the needle valve is open, fuel is sprayed into the cylinder intake tract onto the back of the intake valves. The ECM meters the amount of fuel injected by adjusting the time that the needle valve is open.

For additional information, refer to: Electronic Engine Controls - Description & Operation

FUEL RAIL

SPECIAL TOOLS Tool Illustration Tool Name Tool Number Fuel spring lock decoupling tool 310-005

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. Disconnect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .
2. Remove the engine cover. Refer to «Engine Cover - 4.4L»(/land-rover/range-rover/l322-2005-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
3. Remove the purge valve assembly. Refer to «Evaporative Emission Canister Purge Valve»(/land-rover/range-rover/l322-2005-2009/remont/auxiliary-emission-control-systems/#evaporative-emissions-44l) .
4. Release the heater hose support bracket. Remove the 3 nuts. Tie the bracket aside.
5. Remove the LH engine cover bracket. Release the electrical connector.
6. Remove the RH engine cover bracket. Remove the 2 nuts. Remove the bolt. Release the electrical connector.
7. Disconnect the crankcase vent hoses.
8. Using the special tool, disconnect the fuel line. Position an absorbent cloth to collect fluid spillage.
9. Position the wiring harness support bracket aside for access. Remove the 2 bolts.
10. Release the engine wiring harness clips. Release the 4 clips. Remove the 2 bolts.
11. Disconnect the fuel injector electrical connectors.
12. Disconnect the engine gas recirculation modulator electrical connection.
13. Disconnect the fuel temperature sensor electrical connector.
14. Remove the fuel rail. Remove the 4 Torx bolts. Remove and discard the fuel injector O-ring seals.
15. Remove the fuel temperature sensor.
16. Remove the fuel injectors. Remove the retaining clips. Release the fuel injectors. Remove and discard the fuel injector O-ring seals.

INSTALLATION

1. Clean the components.
2. Install the fuel injectors to the fuel rail. Install fuel injector O-ring seals. Lubricate the O-ring seals with clean engine oil. Install the fuel injectors. Secure the fuel injector retaining clips.
3. Install the fuel temperature sensor. Tighten the sensor to 10 Nm (7 lb.ft).
4. Install the fuel rail. Install fuel injector O-ring seals. Lubricate the O-ring seals with clean engine oil.
5. Connect the fuel temperature sensor electrical connector.
6. Connect the fuel injector electrical connectors.
7. Connect the engine wiring harness to the intake manifold. Tighten the M6 bolts to 10 Nm (7 lb.ft).
8. Connect the fuel line to the fuel rail. Clean the component mating faces. Position the fuel pipe into clips.
9. Connect the crankcase vent hoses. Clean the component mating faces.
10. Install the engine cover mounting brackets. Tighten the nuts to 6 Nm (4 lb.ft). Attach the wiring harness connector blocks to the brackets.
11. Install the heater hose support bracket. Tighten the nuts to 10 Nm (7 lb.ft).
12. Check and top-up the coolant if required.
13. Install the engine cover. Refer to «Engine Cover - 4.4L»(/land-rover/range-rover/l322-2005-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
14. Install the purge valve. Refer to «Evaporative Emission Canister Purge Valve»(/land-rover/range-rover/l322-2005-2009/remont/auxiliary-emission-control-systems/#evaporative-emissions-44l) .
15. Connect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .

Scheme 24

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information) .
2. Remove the engine cover. Refer to «Engine Cover - 4.4L»(/land-rover/range-rover/l322-2005-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
3. Remove the air intake resonator. Refer to «Intake Air Resonator»(/land-rover/range-rover/l322-2005-2009/remont/mechanical/#intake-air-distribution-and-filtering-44l) .
4. Release the throttle body. Remove the 4 bolts. Remove and discard the throttle body gasket.

1. Install the throttle body. Clean the components. Install a new gasket. Tighten the 4 bolts to 10 Nm (7 lb.ft).
2. Install the air intake resonator. Refer to «Intake Air Resonator»(/land-rover/range-rover/l322-2005-2009/remont/mechanical/#intake-air-distribution-and-filtering-44l) .
3. Install the engine cover. Refer to «Engine Cover - 4.4L»(/land-rover/range-rover/l322-2005-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
4. Connect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information) .

REMOVAL

Scheme 25

1. Disconnect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information) .
2. Remove the fuel rail. See «FUEL RAIL»(/land-rover/range-rover/l322-2005-2009/remont/fuel-system/#fuel-charging-and-controls-44l) .
3. Remove the fuel injectors. Release the 8 clips. Remove and discard the fuel injector O-ring seals.

1. Clean the component mating faces.
2. Install the fuel injectors. Lubricate the O-ring seals with clean engine oil. Install fuel injector O-ring seals.
3. Install the fuel rail. See «FUEL RAIL»(/land-rover/range-rover/l322-2005-2009/remont/fuel-system/#fuel-charging-and-controls-44l) .
4. Connect the battery ground cable. Refer to «Specifications»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information) .

See also:
• Intake Air Distribution and Filtering (4.4L)
• Fuel Tank and Lines (4.4L)
• Electronic Engine Controls - Description & Operation
• SPECIFICATIONS
• Engine Cover - 4.4L
• Evaporative Emission Canister Purge Valve
• Specifications
• FUEL RAIL