The Ignition Coil in your Toyota Tercel performs an important job. In order to generate the spark to fire the engine, the Ignition Coil takes the modest 12 volts coming from the battery and generates tens of thousands of volts. Thus, your Ignition Coil is essential for smooth running and crisp starts. Within the device, there is a strong primary winding and a very fine winding of thousands of turns for the secondary winding which wraps an iron core. When the primary circuit opens suddenly, the collapse of the fields raises the voltage to roughly 15,000 to 40,000 volts for the spark. The ignition system of earlier Tercel models was composed of one Ignition Coil and one distributor. The rotor applied to take the high tension current to each cylinder. The line was refined by Toyota and to cut moving parts and enhance reliability, twin coil distributorless systems appeared, each firing two cylinders in a waste spark pair. The later versions adopted designs of a coil-on-plug or coil-near-plug type where every cylinder had its own Ignition Coil for hotter sparks and cleaner emissions. The voltage travel and number of parts are the main differences with a distributor style using long leads, waste spark pack halving the leads and individual coils not using leads at all. No matter what design your Toyota Tercel has, a failing Ignition Coil can announce itself through rough idle, hesitation, poor mileage, or an illuminated check engine light.
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