fuel type FORD MUSTANG 2003 Owner's Manual

REMOVAL AND INSTALLATION
Throttle Body
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.
CAUTION: The throttle body bore and plate area have a special coating and cannot be
cleaned.
1. Remove the air intake scoop bracket. For additional information, refer to Section 303 - 12 .
2. Remove the air cleaner outlet tube. For additional information, refer to Section 303 - 12 .
3. Disconnect the throttle position (TP) sensor electrical connector.
4. Disconnect the accelerator controls. zDisconnect the accelerator cable.
z Disconnect the speed control cable.
z Disconnect the return spring.
5. NOTE: Discard the throttle body gasket after removing the throttle body.
Remove the throttle body. zRemove the four bolts.
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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.
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REMOVAL AND INSTALLATION
Wiring Harness
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.
1. With the vehicle in neutral, position it on a hoist. For additional information, refer to Section 100 -
02 .
2. Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
3. Remove the upper intake manifold. For additional information, refer to Section 303 - 01D .
4. Disconnect the following connectors: zThe 42 pin engine bulkhead electrical connector.
z The 16 pin electrical connector.
5. Separate the wiring harness from the dash panel.
6. Remove the RH ignition coil cover. zRemove the bolts.
z Remove the coil cover.
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REMOVAL AND INSTALLATION
Supply Manifold
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. Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
2. Remove the upper intake manifold. For additional information, refer to Section 303 - 01D .
3. Relieve the fuel pressure. For additional information, refer to Section 310 - 00 .
4. Disconnect the fuel line. For additional information, refer to Section 310 - 00 .
5. Position the wiring harness aside. zDisconnect the RH fuel injector electrical connectors.
z Separate the harness from the RH fuel supply manifold stud bolt.
6. Disconnect the fuel pressure sensor. zDisconnect the electrical connector.
z Disconnect the vacuum hose.
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DESCRIPTION AND OPERATION
Engine Ignition
The ignition coil (12029), which is mounted on the upper intake manifold, can be described as a coil
pack containing three separate coil units. Each coil unit is individually controlled by the powertrain
control module (PCM) (12A650) through separate wire leads. Each coil unit activates two spark plugs
wired in a series by the spark plug wires (12286).
zOne spark plug activates on the compression stroke and uses the majority of the ignition coil's
stored energy.
z The other spark plug activates on the exhaust stroke and uses very little of the ignition coil's
stored energy.
z Because the pairs of spark plugs are connected in a series, one spark will travel from ground to
the electrode while the other spark will travel from the electrode to ground.
The spark plug (12405):
zchanges the high voltage pulse into a spark which ignites the fuel and air mixture.
z originally equipped on the vehicle has a platinum- enhanced active electrode for long life.
The crankshaft position (CKP) sensor (6C315):
NOTE: Initial engine ignition timing is set at 10 degrees ± 2 degrees before top dead center (BTDC)
and is not adjustable.
zis a variable reluctance sensor triggered by a 36- minus-1 tooth trigger pulse wheel located on
the crankshaft (6303) inside the engine front cover (6019).
The sine wave type signal generated from the crankshaft position sensor provides two types of
information:
zposition of the crankshaft in 10 degree increments
z the crankshaft speed (rpm)
The powertrain control module (PCM) (12A650) uses this information to determine ignition coil turn ON
and turn OFF times and misfire detection.
For additional information, refer to Section 303 - 14 .
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual Klj . 1 ba
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7. Inspect for normal burning.
zThis can be identified by light tan or gray deposits on the firing tip.
8. Inspect for pre- ignition.
z This can be identified by melted electrodes and possibly a blistered insulator. Metallic
deposits on the insulator indicate engine damage.
z Install a new spark plug.
9. Inspect for overheating. zThis can be identified by a white or light gray insulator with small black or gray brown
spots and a bluish- burnt appearance of the electrodes.
z This may be caused by engine overheating, the wrong type of fuel, loose spark plugs, too
hot a plug, low fuel pump pressure or incorrect ignition timing.
z Install a new spark plug. Klj . 3 ba
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DESCRIPTION AND OPERATION
Engine Ignition
Eight separate ignition coils (12029):
zare mounted directly above each spark plug (12405).
z are controlled by the powertrain control module (PCM) for correct firing sequence.
The spark plug:
zchanges the high voltage pulse into a spark which ignites the fuel and air mixture.
z originally equipped on the vehicle has a platinum- enhanced active electrode for long life.
Crankshaft position (CKP) sensor (6C315):
NOTE: Initial engine ignition timing is set at 10 degrees ± 2 degrees before top dead center (BTDC)
and is not adjustable. For additional information, refer to the Powertrain Control/Emissions Diagnosis
(PC/ED) manual.
zis a variable reluctance sensor triggered by a 36- minus-1 tooth trigger pulse wheel located on
the crankshaft (6303) inside the engine front cover (6019).
The sine wave type signal generated from the crankshaft position sensor provides two types of
information:
zposition of the crankshaft in 10 degree increments
z the crankshaft speed (rpm)
The powertrain control module (PCM) (12A650) uses this information to determine ignition coil turn ON
and turn OFF times and misfire detection.
For additional information, refer to Section 303 - 14 .
SECTION 303-
07B: Engine Ignition — 4.6L (2V) 2003 Mustang Workshop Manual Klj . 1 ba
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8. Inspect for overheating.
zThis can be identified by a white or light gray insulator with small black or gray brown
spots and with bluish- burnt appearance of the electrodes.
z This may be caused by engine overheating, wrong type of fuel, loose spark plugs, too hot
a plug, low fuel pump pressure or incorrect ignition timing.
z Install a new spark plug.
9. Inspect for fused spot deposits. zThis can be identified by melted or spotty deposits resembling bubbles or blisters.
z This may be caused by sudden acceleration.
z Clean the spark plug.
Installation 1. Adjust the spark plug gap as necessary. Klj . 3 ba
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DESCRIPTION AND OPERATION
Engine Ignition
Eight separate ignition coils:
zare controlled by the powertrain control module (PCM).
z are mounted directly above each spark plug.
z are controlled by the powertrain control module for correct firing sequence.
The spark plug:
zchanges the high voltage pulse into a spark which ignites the fuel and air mixture.
z originally equipped on the vehicle has a platinum- enhanced active electrode for long life.
The crankshaft position (CKP) sensor:
NOTE: Initial engine ignition timing is set at 10 degrees ± 2 degrees before top dead center (BTDC)
and is not adjustable. For additional information, refer to the Powertrain Control/Emissions Diagnosis
(PC/ED) manual.
zis a variable reluctance sensor, triggered by a 36- minus-1 tooth trigger pulse wheel located on
the crankshaft, inside the engine front cover.
The sine wave type signal generated from the crankshaft position sensor provides two types of
information:
zposition of the crankshaft in 10 degree increments
z the crankshaft speed (rpm)
For additional information, refer to Section 303 - 14 .
SECTION 303-
07C: Engine Ignition — 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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DESCRIPTION AND OPERATION
Engine Emission Control
CAUTION: Do not remove any part of the engine emission control system. Operating the
engine without the engine emission control system will reduce fuel economy and engine
ventilation. This will weaken engine performance and shorten engine life.
The engine emission control consists of the:
zpositive crankcase ventilation (PCV) system.
z exhaust gas recirculation (EGR) system.
Typical Vehicle Emission Control Information (VECI) Decal
The Vehicle Emission Control Information (VECI) decal shows:
zthe components of the emission control system.
z the correct vacuum hose routing.
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Item Part Number Description
1 — Adjustment procedure notes
2 — Ignition timing specification
3 — Engine vacuum hose routing (typical)
4 — Spark plug gap specification
5 — Engine type Klj . 1 ba
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