1987 Ford Crown Victoria 5.0L FI 8cylDuraspark Type Plug Wires
The spark plug wires used with the Duraspark type ignition system are
in. (8mm) in diameter to contain the higher output voltage. There are
two types of wires used in this system, and some engines may have both
types installed. It is important to properly identify the type of wire
used for each cylinder before replacements are made.
Both types are blue in color and have silicone
jacketing. The insulation material underneath the jacketing on some
plug wires is a silicone layer separated by glass braid. The plug cable
not incorporating the silicone layer is used where engine temperatures
are cooler and are identified with the letter SE with black printing.
The plug cables with the silicone insulation are used where high engine
temperatures are present. These cables are identified with the letters
SS with white printing.
Each spark plug cable, if original, is
marked with the cylinder number, model year and date of cable
manufacture (quarter and year). Service replacement wires will not have
cylinder numbers, or manufacture date.
On any vehicle equipped with a catalytic converter, never allow the
engine to run for more than 30 seconds with a spark plug wire
disconnected. Unburned fuel in the cylinder may ignite in the converter
as it is exhausted and damage the converter.
removing spark plug wires, mark and tag the individual wires. Grasp,
then slowly, twist the insulator back and forth on the spark plug to
free the insulator. Do not pull on the wire directly as it may become
separated from the connector inside the insulator. Special tools are
available which can help ease plug wire removal, and prevent damage to
When installing a new set of spark plug wires, replace
the wires one at a time so there will be no confusion. Start by
replacing the longest wire first. Route the wire exactly the same as
the original.Fig. 1: 6 cylinder engine-240Firing Order: 1-5-3-6-2-4Distributor Rotation: Clockwise
Fig. 2: 8 cylinder engine-255, 302, 351, 400Firing Order: 1-5-4-2-6-3-7-8Distributor Rotation: Counterclockwise
Fig. 3: 8 cylinder engine-390, 427, 429, 460Firing Order: 1-3-7-2-6-5-4-8 DistributorRotation: Counterclockwise
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