The Nissan Quest Distributor transmits high voltage from the ignition coil to each of the spark plugs, but in the correct firing order. This way, combustion begins at the right moment. Within a cast iron or aluminum housing, the Distributor is equipped with a camshaft-driven shaft. The mechanism spins a rotor that sits beneath the plastic cap. The cap has perimeter terminals that connect to every cylinder and a center post from the coil. As the shaft rotates, the rotor reaches each terminal, allowing current to flow through the plug wires to the spark plugs. Centrifugal weights that respond to engine speed and a vacuum diaphragm that reacts to manifold pressure change spark timing inside the Distributor, advancing or retarding ignition as conditions vary. The earlier units rely on a mechanical breaker point. The electronic version uses a toothed reluctor. It also uses a magnetic or hall sensor. It then opens and closes the circuit with the coil, thus requiring fewer maintenance needs. The Quest unit in Nissan service schedules is treated as a wear part, requiring periodic renewal of the cap and rotor. A dependable performance of the Distributor assists in easy starting and smooth running of Nissan Quest engines. A failing Distributor may cause a Nissan Quest misfire.
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