2003 FORD MUSTANG low oil pressure

REMOVAL AND INSTALLATION
Fuel Injectors
Removal and Installation
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and may ignite. Failure to follow these instructions may result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel pressure must be relieved. Failure to follow these instructions may result
in personal injury
1. Remove the supply manifold. For additional information, refer to Supply Manifold in this section.
2. Remove the six fuel injectors from the supply manifold.
3. CAUTION: The retaining clip must be in the upper groove on the injector or the
injector may become loose.
NOTE: Inspect the two O- rings from each fuel injector. Install new O- rings as needed.
NOTE: Lubricate the new O- rings with clean engine oil to aid installation.
To install, reverse the removal procedure.
SECTION 303-
04A: Fuel Charging and Controls — 3.8L 2003 Mustang Workshop Manual Material
Item Specification
SAE 5W-
20 Premium Synthetic
Blend Motor Oil
XO- 5W20-QSP or equivalent WSS-
M2C153-
H Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

18. Disconnect the generator connectors:
zBattery power supply wire
z Voltage regulator
19. Disconnect the following connectors: zLH fuel injectors
z LH ignition coils
20. Disconnect the following connectors: zExhaust vacuum regulator (EVR)
z Ground wire
21. Disconnect the EGR pressure transducer electrical connector. Klj . 5 ba
142003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Fuel Charging Wiring Harness
Removal and Installation
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and can ignite. Failure to follow these instructions can result in personal injury.
1. Disconnect the battery ground cable.
2. Remove the exhaust gas recirculation (EGR) valve and the exhaust manifold to EGR valve tube. For additional information, refer to Section 303 - 08 .
3. Remove the bolts and the LH ignition coil cover.
4. Disconnect the LH ignition coil electrical connectors. 5. Disconnect the barometric pressure (BARO) sensor electrical connector. SECTION 303-
04C: Fuel Charging and Controls — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
72003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Fuel Injection Supply Manifold and Fuel Injector
Removal and Installation
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and can ignite. Failure to follow these instructions can result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel system pressure must be relieved. Failure to follow these instructions
can result in personal injury.
1. Disconnect the battery ground cable.
2. Remove the air cleaner outlet tube. For additional information, refer to Section 303 - 12 .
3. Release the fuel pressure. For additional information, refer to Section 310 - 00 .
4. Disconnect the fuel supply hose spring lock coupling. For additional information, refer to Section 310 - 00 .
5. Remove the exhaust gas recirculation (EGR) valve and the exhaust manifold- to-EGR valve
tube. For additional information, refer to Section 303 - 08 .
6. Remove the throttle body and spacer assembly.
7. Disconnect the vacuum hose.
SECTION 303-
04C: Fuel Charging and Controls — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Material
Item Specification
SAE 5W-
20 Premium Synthetic
Blend Motor Oil
XO- 5W20- QSP WSS-
M2C153-
H Klj . 1 ba
42003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Fuel Injectors
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and can ignite. Failure to follow these instructions can result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel system pressure must be relieved. Failure to follow these instructions
can result in personal injury.
1. Remove the supply manifold. For additional information, refer to Supply Manifold in this section.
2. Remove the eight fuel injectors from the supply manifold.
Installation CAUTION: The retaining clip must be in the upper groove on the injector or the injector
can become loose.
1. NOTE: Inspect the two O- rings from each fuel injector. Install new O- rings as needed.
NOTE: Lubricate the new O- rings with clean engine oil.
To install, reverse the removal procedure.
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Intake Air Distribution and Filtering —
Supercharger,
Charge Air Cooler
The supercharger (SC) is a positive displacement pump. Its purpose is to supply an excess volume of
intake air to the engine by increasing air pressure and density in the intake manifold. The supercharger
is matched to the engine by its displacement and belt ratio, and can provide excess airflow at any
engine speed.
NOTE: The supercharger is repaired only as an assembly. Disassembly of the supercharger unit may
void the warranty.
NOTE: The supercharger is not a bolt- on option. It is part of an integrated engine system. Many
components of the supercharged engine are not interchangeable with similar parts from a non-
supercharged engine.
The supercharger contains two three- lobed rotors. The helical shape and specialized porting provide a
smooth discharge flow and low level of noise during operation. The rotors are supported by ball
bearings in front and needle bearings at the rear. The drive gears are pressed into place, therefore the
supercharger is installed new as a unit, and is not repairable.
The supercharger system is a blow- through type with the fuel injected directly into the intake ports. The
supercharger is belt driven off the crankshaft through an idler pulley. The throttle body controls the
amount of intake air to the supercharger through the intake plenum. Air from the supercharger is
routed through the charge air cooler (CAC), then to the intake manifold. The resulting denser air
charge in the combustion chamber provides for a higher power output of the engine over a non-
supercharged engine of the same displacement.
NOTE: It is not possible to increase manifold pressure or engine power output by altering the bypass
valve or the actuator.
At partial- throttle opening or when vacuum is present in the intake system, a vacuum- controlled
bypass valve reroutes some discharged air from the supercharger back through the intake plenum.
This prevents the supercharger from cavitating, causing reduced performance, increased
temperatures, and poor fuel economy.
The supercharger has a self- contained oiling system that does not require a fluid change for the life of
the vehicle. However, at every 30,000 mile interval, the supercharger fluid level should be checked.
The vehicle should be parked on a level surface, the engine cool, and not running. To check the oil,
remove the Allen head plug located at the front of the supercharger. The oil level should be at the
bottom of the fill plug threads when cold. If the fluid level is low, add Synthetic Supercharger Fluid
E9SZ- 19577- A or equivalent meeting Ford specification ESE-M99C115–A
Supercharged vehicles are equipped with a charge air cooler (CAC). The CAC cools the pressurized
air from the supercharger, increasing the air density, which improves combustion efficiency, engine
horsepower and torque. SECTION 303-
12: Intake Air Distribution and Filtering 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Fuel Pressure Sensor
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and may be ignited. Failure to follow these instructions may result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel system pressure must be relieved. Failure to follow these instructions
may result in personal injury.
Mach I
1. Remove the air intake scoop. For additional information, refer to Section 303 - 12 .
All engines 2. Relieve the fuel pressure. For additional information, refer to Section 310 - 00 .
3. NOTE: The 4.6L (4V) Cobra engine is shown, the other engines are similar.
Disconnect the connector and the vacuum line. 4. Remove the bolts and the sensor. SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual Material
Item Specification
Super Premium SAE 5W-20
Motor Oil
XO- 5W20- DSP or equivalent WSS-
M2C914-
A Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Ignition Coil —
Coil On Plug
The engine uses eight separate coil per plug units. Each coil per plug unit is controlled by the
powertrain control module (PCM).
Each coil per plug unit is mounted directly above each spark plug and activates its own spark plug in
the correct sequence as controlled by the PCM.
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for additional information on the
ignition system.
Intake Air Temperature (IAT) Sensor
The intake air temperature (IAT) sensor provides the sequential fuel injection (SFI) system mixture
temperature information. The IAT sensor is used both as a density corrector for air flow calculation and
to proportion cold enrichment fuel flow. The IAT sensor is installed in the air cleaner inlet tube. The IAT
sensor is also used in determining EPC pressures.
Mass Air Flow (MAF) Sensor
The mass air flow (MAF) sensor measures the mass of air flowing into the engine. The MAF sensor
output signal is used by the powertrain control module to calculate injector pulse width. For
transmission strategies, the mass air flow sensor is used to regulate EPC, shift and torque converter
clutch scheduling.
Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a
signal is sent to the PCM to allow automatic shifts from first through fourth gears or first through third
gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.
The TCIL indicates overdrive cancel mode activated (lamp on). When the TCIL is flashing, it indicates
electronic pressure control (EPC) circuit shorted or a monitored sensor failure.
Throttle Position (TP) Sensor
The throttle position (TP) sensor is a potentiometer mounted on the throttle body. The TP sensor
detects the position of the throttle plate and sends this information to the PCM. The TP sensor is used
for shift scheduling, electronic pressure control (EPC) and TCC control.
Digital Transmission Range (TR) Sensor
The digital transmission range (TR) sensor is located on the outside of the transmission at the manual
lever. The digital sensor completes the start circuit in PARK and NEUTRAL, and the back- up lamp
circuit in REVERSE. The digital sensor also opens/closes a set of four switches that are monitored by
the PCM to determine the position of the manual lever (P, R, N, D, 2, 1).
Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that
sends a signal to the powertrain control module (PCM) to indicate transmission output shaft speed.
The OSS sensor is used for torque converter clutch (TCC) control, shift scheduling and to determine
electronic pressure control (EPC).
Electronic Pressure Control (EPC) Solenoid
The EPC solenoid regulates transmission pressure. EPC valve pressure is used to control line
pressure.
Torque Converter Clutch (TCC) Solenoid Klj . 2 ba
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