2003 FORD MUSTANG engine

z
Install a new spark plug.
5. Inspect for carbon fouling. zThis can be identified by black, dry fluffy carbon deposits on 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.
6. Inspect for normal burning. zThis can be identified by light tan or gray deposits on the firing tip.
7. Inspect for pre- ignition.
z This can be identified by melted electrodes and possibly a blistered insulator. Metallic
deposits on insulator indicate engine damage.
z Install a new spark plug. Klj . 2 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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SPECIFICATIONS
SECTION 303-
07C: Engine Ignition — 4.6L (4V) 2003 Mustang Workshop Manual General Specifications
Item Specification
Ignition timing 10 degrees BTDC ±
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-
32EM
Torque Specifications Description Nm lb-
ft lb-
in Spark plugs 15 11 —
Ignition coil cover bolts 10 — 89 Klj . 1 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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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
12003 Mustang Workshop Manual
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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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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.
SECTION 303-
07C: Engine Ignition — 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
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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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