Ignition System: Description and Operation

Ignition Component Locations:

PURPOSE
The Bosch EZL ignition system delivers a precisely timed, high energy spark to the combustion chamber to ensure efficient combustion, optimum performance, and strict emissions compliance. The high tension ignition system delivers sufficient energy to ignite the air/fuel mixture under all normal operating conditions.

COMPONENTS
The EZL/AKR computerized ignition system consists of (2) EZL/AKR control units, (2) ignition coils, (2) high-tension distributor, ignition wires with suppression connectors, and spark plugs.

OPERATION
High voltage for cylinders 1, 4, 6 and 7 is routed through the distributor mounted on the left cylinder head, and high voltage for cylinders 5, 8, 3, and 2 are routed through the distributor mounted on the right cylinder head.

The primary side of the coils is connected with the positive battery terminal via the ignition switch. During the primary current-flow time (coil saturation) the coil is connected to ground through the power output transistor of the EZL/AKR control unit (ECU). The ECU receives input signals from the ignition switch, crankshaft position sensor, reference resistor, intake manifold vacuum signal, coolant temperature sensor, throttle valve switch, camshaft position sensor, knock sensors, transmission overload protection sensor, and the CIS-E control unit; processes these signals, and calculates the appropriate dwell/ignition angle, and simultaneously switches the ignition coil ground circuit.