Spark Plug - Ford 2003 Mustang Workshop Manual

SECTION 303-07B: Engine Ignition — 4.6L (2V)
REMOVAL AND INSTALLATION

Spark Plug

Removal
1. Remove the ignition coil on plug. For additional information, refer to
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.
This can be identified by a deposit build up closing the gap between electrodes.
This can be caused by oil or carbon fouling.
Clean the spark plug.
4. Inspect for oil fouling.
This can be identified by wet black deposits on the insulator shell bore electrodes.
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.
2003 Mustang Workshop Manual
Ignition Coil—Coil On Plug