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DIAGNOSIS AND TESTING
Engine Ignition
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
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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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07B: Engine Ignition — 4.6L (2V) 2003 Mustang Workshop Manual Klj . 1 ba
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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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