2003 FORD MUSTANG fuel type

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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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
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REMOVAL AND INSTALLATION
Evaporative Emission Canister
Removal and Installation
1. WARNING: The evaporative emission system contains fuel vapor and condensed
fuel vapor. Although not in large quantities, it still presents the danger of explosion or
fire. Disconnect the battery ground cable from the battery to minimize the possibility of
an electrical spark occurring, possibly causing a fire or explosion if fuel vapor or liquid
fuel is present in the area. Failure to follow these instructions may result in personal
injury.
Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
2. Raise and support the vehicle. For additional information, refer to Section 100 - 02 .
3. Remove the left rear wheel. For additional information, refer to Section 204 - 04 .
4. WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or around any fuel- related component. Highly flammable mixtures are always
present and may be ignited. Failure to follow these instructions may result in personal
injury.
Disconnect the canister vent solenoid hose assembly.
5. Disconnect the connector.
6. Disconnect the evaporative emission (EVAP) canister purge outlet tube.
SECTION 303-
13: Evaporative Emissions 2003 Mustang Workshop Manual Klj . 1 ba
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