The small yet important component of a Mazda Tribute is the Ignition Coil, which transforms the 12 volts of the battery to 15,000 to 40,000 volts and causes each spark plug to ignite the air-fuel blend when needed. It is housed in epoxy around a laminated iron core, which supports two copper windings, a low-turn primary and a high-turn secondary, and, when the current in the primary is switched off, the collapsing magnetic field produces the surge that is sent to the plugs. Early model years employed a single coil which supplied a distributor cap and rotor, receiving the voltage via long plug wires. Subsequent designs, including the Tribute, converted to distributorless waste-spark coil packs, where each pack had two or more coils which fired paired cylinders with each crank revolution, and one spark was wasted but reliability increased. The new design is called coil-on-plug, whereby an Ignition Coil is placed directly above each spark plug, eliminating much of the wasted energy and eliminating large wires. Each architecture was selected by Mazda in line with the changing electronics based on the cost-performance ratio. The style does not matter; the housing can crack from heat, vibration, and moisture that afflicted certain Mazda years, causing hard starts, misfires, and highway stalls which occurred unexpectedly. The use of regular inspections, proper maintenance of plug gaps, and replacement of coils, typically at 60,000 to 80,000 miles, is applied to ensure that owners maintain sharp throttle response and the fuel economy numbers Mazda is boasting. Since the Tribute has an engine bay layout identical to other company models, it is an easy task to access the coils, and thus preventive checks are fast. Checking Ignition Coil resistance values with a multimeter against factory values is a quick way of unearthing concealed woes.
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