Question about Cars & Trucks
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Posted on Jan 02, 2017
1987 Ford Crown Victoria 5.0L FI 8cyl
Duraspark Type Plug Wires
The spark plug wires used with the Duraspark type ignition system are 5 / 16 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.
When 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 a cable.
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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I hope helped (rememer rated this) Good luck.
Posted on Oct 15, 2009
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