FORD MUSTANG 2003 Workshop Manual

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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Klj . 2 ba
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DIAGNOSIS AND TESTING
Engine Ignition
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
SECTION 303-
07C: Engine Ignition — 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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REMOVAL AND INSTALLATION
Ignition Coil-
On-Plug
Removal and Installation 1. Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
2. Remove the air cleaner outlet pipe. For additional information, refer to Section 303 - 12 .
3. Remove the RH ignition coil cover bolts and the cover.
4. Remove the ignition coils. 1. Disconnect the electrical connectors.
2. Remove the ignition coils.
SECTION 303-
07C: Engine Ignition — 4.6L (4V) 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
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5. Remove the LH ignition coil cover bolts and the cover.
6. Remove the ignition coils.
1. Disconnect the connectors.
2. Remove the ignition coils. Klj . 2 ba
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7.
NOTE: Verify that the ignition coil spring is correctly located inside the ignition coil boot and that
there is no damage to the tip of the boot.
To install, reverse the removal procedure.
zApply a light coat of dielectric grease to the inside of the ignition coil boots. Klj . 3 ba
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REMOVAL AND INSTALLATION
Spark Plugs
Removal and Installation
1. Remove the ignition coil- on-plug. For additional information, refer to Ignition Coil - On - Plug in this
section.
2. 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 used, make sure it is installed in the same cylinder from which
it was taken. New spark plugs can be used in any cylinder.
Remove the RH spark plugs.
3. Remove the LH spark plugs.
4. Inspect the spark plugs. Install new spark plugs as necessary. For additional information, refer to Section 303 - 00
5. Adjust the spark plug gap as necessary.
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6. To install, reverse the removal procedure. Klj . 2 ba
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SPECIFICATIONS
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Torque Specifications
Description Nm lb-
ft lb-
in EGR vacuum regulator solenoid nuts 7 — 62
Differential pressure feedback EGR 7 — 62
Differential pressure feedback EGR —
Bullitt 10 — 89
EGR valve bolts 10 — 89
EGR valve-to-
exhaust manifold tube fitting 35 26 —
EGR tube-
to-exhaust manifold fitting (except Bullitt) 40 30 —
EGR tube-
to-exhaust manifold fitting 35 26 —
Vacuum accessory bracket fasteners 10 — 89
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhuast gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 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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