spark plugs FORD MUSTANG 2003 Owner's Manual

IN-
VEHICLE REPAIR
Valve — Springs, Retainer and Valve Stem Seal
Removal 1. Remove the roller followers. For additional information, refer to Roller Followers in this section.
2. Remove the spark plugs. For additional information, refer to Section 303 - 07C .
3. Position the piston of the cylinder being serviced at the bottom of the stroke.
4. CAUTION: If air pressure has forced the piston to the bottom of the cylinder any
loss of air pressure will allow the valve to fall into the cylinder. If air pressure must be
removed support the valve prior to removal. Use compressed air in the cylinder to hold both valves in position. SECTION 303-
01D: Engine — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Special Tool(s)
Compressor, Valve Spring
303-
452 (T93P-6565- AR) Installer, Valve Stem Oil Seal
303-
383 (T91P-6571- A) Compressor, Valve Spring
303-
567 (T97P-6565- AH) Spacer, Valve Spring
Compressor
303-
382 (T91P-6565- AH) Klj . 1 ba
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4. Using the special tool, install the intake valve spring, the spring retainer and the valve spring
retainer keys.
5. Install the Valve Spring Compressor Spacer between the valve spring coils to protect the intake valve stem seal from damage.
6. Using the special tool, install the exhaust valve spring, the spring retainer and the valve spring retainer keys.
7. Remove the compressed air hose from the cylinder.
8. Install the spark plugs. For additional information, refer to Section 303 - 07C .
9. Install the roller followers. For additional information, refer to Roller Followers in this section. Klj . 4 ba
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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
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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
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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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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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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.
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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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
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...