oil FORD MUSTANG 2003 Workshop Manual

DESCRIPTION AND OPERATION
Starting System
Starter Motor
The starter motor is a 12-
volt unit that has the starter solenoid mounted on the drive end housing and
functions as follows:
zThe current flows through the solenoid energizing coil until the solenoid plunger is at the end of
its travel.
z The plunger closes a set of contacts that bypass the energizing coil, letting the holding coil keep
the starter drive engaged and passing starting current to the starter motor.
z The motor is energized when the starter solenoid contacts are closed.
z The starter drive engages the flywheel ring gear and starts the engine.
z An overrunning clutch in the starter drive protects the starter motor from excessive speed when
the engine starts.
Starter Relay
The starter interrupt relay consists of:
zpull in coil and contacts
When the ignition switch is in the START position:
zthe pull- in coil is activated and pulls the contacts together.
z current passes through the starter relay from the engine compartment power distribution box to
the starter solenoid.
Clutch Pedal Position (CPP) Switch
The CPP switch for:
za manual transmission closes when the clutch pedal is depressed, completing the starting
circuit.
z an automatic transmission is a jumper inserted in place of the CPP switch to complete the
circuit.
Starter System — Operation
When the ignition switch is turned to the START position the starter relay switches power to the starter
solenoid causing the starter motor to engage as long as:
zthe clutch pedal is depressed (manual transmission only).
z the digital transmission range (TR) sensor is in PARK or NEUTRAL (automatic transmission
only).
SECTION 303-
06: Starting System 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
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SPECIFICATIONS
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual General Specifications
Item Specification
Base ignition timing TBD
Firing order 1-4-2-5-3-
6 Spark plug gap mm (in) 1.32-
1.42 (0.052- 0.056) Spark plug type production LH AWSF-
42E Spark plug type production RH AWSF-
42EG Spark plug type service AWSF-
42EE Silicone Brake Caliper Grease and Dielectric Compound D7AZ-19A331-
A ESE-
M1C171- A
Torque Specifications Description Nm lb-
ft lb-
in Spark plugs 15 11 —
Ignition coil bolts 7 — 52 Klj . 1 ba
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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
22003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Ignition Coil
Removal and Installation
1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414 -
01 .
2. Disconnect the ignition coil electrical connector.
3. CAUTION: Spark plug wires (12286) must be connected to the correct ignition coil
terminal. Mark spark plug wire locations before removing them.
Twist while pulling upward to disconnect the spark plug wires.
4. Disconnect the accelerator cable retaining clamp from the ignition coil stud bolt.
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual Material
Item Specification
Silicone Brake Caliper Grease
and Dielectric Compound
D7AZ-
19A331-A or equivalent ESE-
M1C171-
A Klj . 1 ba
22003 Mustang Workshop Manual
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5. Remove the bolts and the ignition coil (12029).
6.
NOTE: Apply silicone brake caliper grease and dielectric compound to the inside of the spark
plug wire coil boot.
NOTE: Be sure to reinstall the radio ignition interference capacitor (18801) under the correct
mounting bolt.
To install, reverse the removal procedure. Klj . 2 ba
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REMOVAL AND INSTALLATION
Spark Plug Wire
Removal and Installation
CAUTION: It is important to twist the spark plug wire boots while pulling upward to avoid
possible damage to the spark plug wire.
CAUTION: Spark plug wires must be connected to the correct ignition coil terminal. Mark
spark plug wire (12286) locations before removing them.
1. Using the special tool, remove the spark plug wire from the spark plug using a twisting motion.
2. Twist while pulling upward to disconnect the spark plug wires from the ignition coil (12029).
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual Special Tool(s)
Remover, Spark Plug Wire
303-
106 (T74P- 6666A)
Material Item Specification
Silicone Brake Caliper Grease
and Dielectric Compound
D7AZ-
19A331-A or equivalent ESE-
M1C171-
A Klj . 1 ba
22003 Mustang Workshop Manual
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3.
CAUTION: Be sure to orient the spark plug boots so the spark plug wires do not
contact the exhaust manifold.
NOTE: Apply silicone brake caliper grease and dielectric compound to the inside of spark plug
and ignition coil boots of the spark plug wire.
To install, reverse the removal procedure. Klj . 2 ba
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REMOVAL AND INSTALLATION
Spark Plugs
Removal and Installation
CAUTION: It is important to twist the spark plug wire boots while pulling upward to avoid
possible damage to the spark plug wire.
CAUTION: Spark plug wires must be connected to the correct ignition coil terminal. Mark
spark plug wire (12286) locations before removing them.
1. Remove the air cleaner outlet pipe. For additional information, refer to Section 303 - 12 .
2. Using the special tool, remove the spark plug wires from the spark plugs using a twisting motion.
3. NOTE: Use compressed air to remove any foreign material from the spark plug well before
removing the spark plugs.
NOTE: If an original spark plug is reused, make sure it is installed in the same cylinder from
which it was taken. New spark plugs can be used in any cylinder.
NOTE: Left side shown, right side similar.
Remove the spark plugs.
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual Special Tool(s)
Remover, Spark Plug Wire
303-
106 (T74P- 6666A)
Material Item Specification
Silicone Brake Caliper Grease
and Dielectric Compound
D7AZ-
19A331-A or equivalent ESE-
M1C171-
A Klj . 1 ba
52003 Mustang Workshop Manual
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4. Inspect for gap bridged.
zThis can be identified by deposit build up closing the gap between electrodes.
z This may be caused by oil or carbon fouling.
z Clean the spark plug.
5. Inspect for oil fouling. zThis can be identified by wet black deposits on the insulator shell bore electrodes.
z This may be caused by excessive oil entering the combustion chamber through worn
rings and pistons, excessive clearance between valve guides and stems, or worn or
loose bearings. Correct the oil problem.
z Install a new spark plug.
6. Inspect for carbon fouling. zThis can be identified by black, dry, fluffy carbon deposits on the insulator tips, exposed
shell surfaces and electrodes.
z This may be caused by too cold a plug, dirty air cleaner, damaged fuel pump, too rich a
fuel mixture or excessive idling.
z Clean the spark plug. Klj . 2 ba
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SPECIFICATIONS
SECTION 303-
07B: Engine Ignition — 4.6L (2V) 2003 Mustang Workshop Manual General Specifications
Item Specification
Base ignition timing 10 degrees ±
2 degrees non- adjustable Firing order 1-3-7-2-6-5-4-
8 Spark plug gap mm (in) 1.32-
1.42 (0.052- 0.056) Spark plug type AWSF-
32PP
Torque Specifications Description Nm lb-
ft lb-
in Spark plugs 15 11 —
Coil on plug bolts 10 — 89 Klj . 1 ba
12003 Mustang Workshop Manual
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