2003 FORD MUSTANG spark plugs

39.
NOTE: Use compressed air to remove any foreign material from the spark plug well before
removing the spark plugs.
NOTE: One spark plug shown, others are similar.
Remove the spark plugs.
40. Install the special tool between the valve spring coils to prevent valve stem seal damage.
41. NOTE: Rotate the camshaft to see the base circle of the camshaft's lobe before removing the
followers. Keep roller followers in order when removing.
Use the special tool to compress the valve springs and remove the 16 camshaft roller followers.
Rotate the camshaft and crankshaft as necessary.
42. Remove the crankshaft pulley bolt. Klj . 13 ba
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43.
NOTE: Use compressed air to remove any foreign material from the spark plug well before
removing the spark plugs (12405).
NOTE: One spark plug is shown; others are similar.
Remove the spark plugs.
44. NOTE: Rotate the camshaft to the base circle of the camshaft lobe before removing followers.
Keep roller followers in order when removing.
Use special tool to compress the valve springs (6513) and remove the 16 camshaft roller
followers.
zRotate the camshaft and the crankshaft as necessary.
45. Remove the crankshaft pulley bolt.
46. Using the special tool, remove the crankshaft pulley. Klj . 15 ba
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68. Install the camshaft roller followers.
1. Install the special tool.
2. Compress the valve spring.
3. Install the camshaft follower.
69. NOTE: One spark plug shown, others similar.
Install spark plugs.
70. NOTE: The RH side is shown, the LH side is similar. Klj . 26 ba
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39.
NOTE: Lubricate the camshaft roller followers using clean engine oil.
NOTE: Position the cam lobe away from the camshaft roller follower location prior to installing
each camshaft roller follower.
Install the camshaft roller followers. 1. Install the special tool.
2. Compress the valve spring.
3. Install the camshaft roller followers in their original locations.
40. Remove the special tool.
41. NOTE: One spark plug shown, others similar.
Install the spark plugs.
42. NOTE: RH side shown, LH side similar.
NOTE: If not secured within four minutes, the sealant must be removed and the sealing area
cleaned. To clean the sealing area, use silicone gasket remover and metal surface prep. Follow
the directions on the packaging. Failure to follow this procedure can cause future oil leakage.
Apply silicone gasket and sealant in the locations shown. Klj . 15 ba
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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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