The engine's effectiveness depends upon how effective your spark plug actively works to ignite compressed air-fuel blend inside your combustion chamber. Your spark plug derives its igniting power from your Mercury Marquis spark plug wire. It is a very protected cable which then links the ignition coil to the spark plug, which in turn, is pierced into the head cylinder of an engine. This specific cable will transport voltage to the spark plug that will be employed to spark the compressed fuel-air inside the cylinder.

To ensure that your Mercury Marquis spark plug wire is capable of hold above 3,000 volts, it is then intensely covered. Wear and tear found on the insulation or its fitting make cable ineffective. You have to change your defective ignition wire immediately to stop it from causing severe problems in the engine.

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