DeVille V8-4.9L VIN B (1995)
Spark Plug Wire: Description and Operation
The spark plug wire boots contain FHC grease as a lubricant, which will last the entire life of the spark plug wires. This coating is clear with a
slightly waxy feel. The coating helps prevent the silicone spark plug boot from sticking to the spark plug ceramic. This greatly reduces the effort
required to remove and install the spark plug boot and spark plug wires. If silicone type lubricants are added to FHC coated spark plug boot,
carbon tracking of spark plugs may occur.
NOTE: It is important that technicians wash their hands after handling coated spark plugs and before smoking. The coating itself is a
non-hazardous material and incidental contact will not cause any adverse effects. However, exposure to polymer vapors - the result of
contamination of cigarette products and subsequent burning of the polymer may result in flu-like symptoms and should be avoided.
The spark plug wiring connects the distributor to the spark plugs. Spark plug wires used in this system are composed of four major components:
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An 8mm (5/16") silicone jacket for high temperature protection. This outer jacket also provides excellent insulation for the high voltages of the
ignition system.
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A reinforcing fiberglass braid for strength.
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An inner core insulation composed of Ethylene Propylene Diane Monomer (EPDM) for strength and voltage insulation.
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A Composite High Temperature (CHT) core composed of aramid fibers impregnated with conductive latex and wrapped with conductive
silicone.
Care should be exercised when connecting a timing light of other test equipment to the spark plug wires. Do not force anything between the boot
and wiring, or through the silicone jacket. Connection should be made in series using an adapter or by using a inductive pickup. DO NOT pull on
the wire to remove, pull on the boot, or use a tool designed for this purpose.
