FORD MUSTANG 2003 Workshop Manual

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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DIAGNOSIS AND TESTING
Engine Ignition
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
SECTION 303-
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REMOVAL AND INSTALLATION
Ignition Coil —
Coil On Plug
Removal 1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414 -
01 .
2. Remove the air cleaner outlet tube (9B659). For additional information, refer to Section 303 - 12 .
3. NOTE: One ignition coil is shown, and the others are similar.
Disconnect the connector from the ignition coil (12029).
4. Remove the bolt and the ignition coil.
Installation 1. NOTE: Verify the ignition coil spring is correctly located inside the ignition coil boot and there is
no damage to the tip of the boot.
To install, reverse the removal procedure.
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REMOVAL AND INSTALLATION
Spark Plug
Removal
1. Remove the ignition coil on plug. For additional information, refer to Ignition Coil — 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 (12405).
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 used in any cylinder.
NOTE: One spark plug is shown; others are similar.
Remove the spark plugs
3. Inspect for gap bridged. zThis can be identified by a deposit build up closing the gap between electrodes.
z This can be caused by oil or carbon fouling.
z Clean the spark plug.
4. Inspect for oil fouling. zThis can be identified by wet black deposits on the insulator shell bore electrodes.
z This can 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.
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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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2. To install, reverse the removal procedure. Klj . 4 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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