fuel pressure FORD MUSTANG 2003 Owner's Manual

IN-
VEHICLE REPAIR
Valve Cover LH
Removal and Installation 1. Remove the Hydro Boost brake booster. For additional information, refer to Section 206 - 07 .
2. Remove the LH ignition coils. For additional information, refer to Section 303 - 07C .
3. Disconnect the engine coolant temperature (ECT) sensor and unclip the wiring harness from the stud.
4. Unclip the wiring harness from the power steering bracket.
5. Disconnect the electrical connectors from the fuel pulse damper, EGR vacuum regulator solenoid, supercharger bypass vacuum solenoid, and the differential pressure feedback EGR
system.
SECTION 303-
01C: Engine — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Material
Item Specification
Silicone Gasket and Sealant
F7AZ-
19554- EA WSE-
M4G323- A4 Metal Surface Cleaner
F4AZ-
19A536- RA WSE-
M5B392- A Klj . 1 ba
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6. Disconnect the vacuum hoses from the differential pressure feedback EGR system.
7. Disconnect the vacuum hoses from the supercharger bypass vacuum solenoid and the actuator.
8. Disconnect the vacuum hoses from the fuel pulse damper and the EGR vacuum regulator
solenoid, and position the vacuum harness aside. 9. Remove the vacuum accessory bracket mounting nut. Klj . 2 ba
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REMOVAL
Engine
Removal
1. Remove the battery. For additional information, refer to Section 414 - 01 .
2. Release the fuel pressure. For additional information, refer to Section 310 - 00 .
3. Drain the engine cooling system. For additional information, refer to Section 303 - 03A .
4. Drain the supercharger cooling system. For additional information, refer to Section 303 - 03B .
5. Recover the A/C system refrigerant. For additional information, refer to Section 412 - 00 .
6. Remove the hood- to-body ground strap. 7. NOTE: Mark the hood hinge locations to aid in hood installation. SECTION 303-
01C: Engine — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Special Tool(s)
Lifting Bracket, Engine
303-
D087 (D93P-6001- A1) Lifting Bracket, Engine
303-
D088 (D93P-6001- A2) Spreader Bar
303-
D089 (D93P-6001- A3) Klj . 1 ba
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12. Disconnect the throttle position (TP) sensor and the idle air control (IAC) valve electrical
connectors.
13. Disconnect the vacuum hose.
14. Disconnect the A/C pressure switch electrical connector.
15. Disconnect the fuel tube spring lock coupling. For additional information, refer to Section 310 -
00 . Klj . 3 ba
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pressure feedback EGR system.
9. Disconnect the vacuum hoses from the differential pressure feedback EGR system.
10. Disconnect the vacuum hoses from the supercharger bypass vacuum solenoid and the actuator.
11. Disconnect the vacuum hoses from the fuel pulse damper and the EGR vacuum regulator solenoid.
12. Disconnect the vacuum hose from the EGR valve. Klj . 4 ba
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95. Connect the vacuum hoses to the supercharger bypass vacuum solenoid and the actuator.
96. Connect the vacuum hoses to the differential pressure feedback EGR system.
97. Connect the electrical connectors to the fuel pulse damper, EGR vacuum regulator solenoid,
supercharger bypass vacuum solenoid, and the differential pressure feedback EGR system. 98. Install the drain plug. Klj . 32 ba
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51. Connect the accelerator controls.
zConnect the accelerator cable.
z If equipped, connect the speed control cable.
52. Connect the fuel tube spring lock coupling. For additional information, refer to Section 310 - 00 .
53. Connect the A/C pressure switch electrical connector.
54. Connect the vacuum hose. Klj . 14 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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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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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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