2003 FORD MUSTANG fuel

DESCRIPTION AND OPERATION
Engine
WARNING: Do not operate the engine with the hood open until the fan blade has been first
examined for possible cracks and separation.
The 4.6L (4V) (281 CID) is a V- 8 engine with the following features:
z dual overhead camshafts
z four valves per cylinder
z sequential multiport fuel injection (SFI)
z an aluminum intake manifold
z aluminum cylinder heads
z a cast aluminum, 90-degree V- cylinder block
z individually chain- driven camshafts with a hydraulic timing chain tensioner on each timing chain
z the electronic ignition system with eight ignition coils
Identification
Always refer to these labels when replacement parts are necessary or when checking engine
calibrations. The engine parts often differ within a CID family. Verification of the identification codes will
ensure that the correct parts are obtained. These codes contain all the pertinent information relating to
the dates, optional equipment and revisions. The Ford Master Parts Catalog contains a complete
listing of the codes and their application.
Code Information
The engine code information label, located on the side of the valve cover and the front side of the
valve cover, contains the following:
zengine build date
z engine plant code
z engine code
Exhaust Emission Control System
Operation and necessary maintenance of the exhaust emission control devices used on this engine is
covered in the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
Induction System
The sequential multiport fuel injection (SFI) provides the fuel/air mixture needed for combustion in the
cylinders. The eight solenoid- operated fuel injectors:
z are mounted in the lower intake manifold.
z meter fuel into the air intake stream in accordance with engine demand.
z are positioned so that their tips direct fuel just ahead of the engine intake valves.
SECTION 303-
01D: Engine — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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z
are connected in series with the fuel pressure sensor.
z supply fuel from the fuel tank with a fuel pump mounted in the fuel tank.
A constant fuel pressure drop is maintained across the fuel injectors by the fuel pressure sensor. The
fuel pressure sensor:
zis positioned upstream from the fuel injectors on the fuel injection supply manifold.
Valve Train
The valve train operates as follows:
zball- tip hydraulic lash adjusters provide automatic lash adjustment.
z roller followers ride on the camshaft lobes, transferring the up-and- down motion of the
camshafts to the valves in the cylinder heads.
Positive Crankcase Ventilation System
All engines are equipped with a closed- type positive crankcase ventilation system recycling the
crankcase vapors to the upper intake manifold.
Lubrication System
The engine lubrication system operates as follows:
zoil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil
pan.
z oil is pumped through the oil bypass filter on the left front side of the cylinder block.
z oil enters the main oil gallery where it is distributed to the crankshaft main journals and to both
cylinder heads.
z From the main journals, the oil is routed through cross- drilled passages in the crankshaft to
lubricate the connecting rod bearings. Controlled leakage through the crankshaft main bearings
and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls as
well as the entire connecting rod, piston and piston rings assembly.
z The left cylinder head is fed from a drilling into the supply passage feeding the main gallery at
the front of the cylinder block. The right cylinder head is fed from a drilling into the rear of the
main gallery. Main gallery pressure is reduced as it enters the cylinder head galleries through
fixed serviceable orifices located at the upper part of the feed passages. It is this reduced
pressure in the cylinder head galleries which feeds the camshaft journals, the hydraulic lash
adjusters and the primary and secondary timing chain tensioners.
z The camshaft lobe and roller followers are lubricated by splash created through valve train
operation.
Oil Pump
The lubrication system of the 4.6L (4V) engine is designed to provide optimum oil flow to critical
components of the engine through its entire operating range. The heart of the system is a positive
displacement internal gear oil pump using top seal rotors. Generically this design is known as a gerotor
pump, which operates as follows.
zThe oil pump is mounted on the front face of the cylinder block.
z The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft. Klj . 2 ba
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9 9D476 EGR valve gasket
10 9J459 EGR vacuum regulator solenoid
11 W701557 Bolt (2 req'd)
12 9F792 Fuel injection supply manifold
13 N811449 Stud (4 req'd)
14 9E498 Vacuum harness
15 W704682 Bolt (10 req'd)
16 9J447 Intake manifold (lower)
17 8548 Coolant crossover
18 9F593 Fuel Injector (8 req'd)
19 N605892 Bolt (2 req'd)
20 9728 Bracket
21 9424 Intake manifold (upper)
22 9E936 Throttle body gasket
23 9E926 Throttle body Klj . 6 ba
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IN-
VEHICLE REPAIR
Intake Manifold — Lower
Removal 1. Remove the upper intake manifold. For additional information, refer to Intake Manifold — Upper
in this section.
2. Disconnect the fuel line. For additional information, refer to Section 310 - 00 .
3. Remove the coolant by- pass tube. For additional information, refer to Section 303 - 03A .
4. Remove the generator. For additional information, refer to Section 414 - 02 .
5. Disconnect the electrical connector and the vacuum line from the fuel pressure sensor.
6. Disconnect the eight fuel injector electrical connectors.
7. Separate the fuel charging wiring harness from the fuel injection supply manifold studs in three places.
SECTION 303-
01D: Engine — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Material
Item Specification
Metal Surface Cleaner
F4AZ-
19A536- RA or equivalent WSE-
M5B392- A Klj . 1 ba
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8. Remove the ten bolts in the sequence shown and raise the lower intake manifold slightly.
9. Disconnect the fuel charging wiring harness from the rear of the lower intake manifold and
remove the manifold.
10. Remove the intake manifold gaskets. zClean and inspect the sealing surfaces.
Installation 1. Install the lower intake manifold gaskets. Klj . 2 ba
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2. Connect the fuel charging wiring harness to the rear of the lower intake manifold and install the
manifold.
3. Install the intake manifold fasteners and tighten in the sequence shown.
4. Position the fuel charging wiring harness and connect it to the fuel injection supply manifold in three places.
5. Connect the eight fuel injector electrical connectors. Klj . 3 ba
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6. Connect the electrical connector and the vacuum line to the fuel pressure sensor.
7. Install the generator. For additional information, refer to
Section 414 - 02 .
8. Install the coolant bypass tube. For additional information, refer to Section 303 - 03A .
9. Connect the fuel line. For additional information, refer to Section 310 - 00 .
10. Install the upper intake manifold. For additional information, refer to Intake Manifold — Upper in
this section. Klj . 4 ba
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7. Remove the ignition coils.
8. Remove the throttle body. For additional information, refer to Section 303
- 04D .
9. Disconnect the fuel tube spring lock coupling. For additional information, refer to Section 310 -
00 .
10. Disconnect the heater hose.
11. Disconnect the A/C suction tube at the accumulator.
12. Disconnect and remove the A/C suction tube. Klj . 2 ba
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