In read-only memory (ROM) The microcomputer has 256 values of the ignition timing, corresponding to 16 values of the crankshaft speed and 16 values of the engine load.
Based on the information from the sensors, the microcomputer calculates the optimal ignition timing and compares it with the values stored in the ROM. If the calculated ignition timing matches the values entered into the ROM, the microcomputer uses this value. If the calculated value of the ignition advance angle is between any two consecutive values in the ROM, the intermediate memory of the microcomputer determines the intermediate value of the ignition advance angle. The intermediate memory can calculate three different intermediate ignition timing values. This ensures a very high accuracy of ignition timing control.
Ignition coil
Brand and type: AC Delco 90 240 252.
Primary winding resistance at +20°С, Ohm: 0.300-0.652.
Resistance of the secondary winding at +20°C, kOhm: 7.2-8.2.
Spark plug
Make and type: AC Delco CR 42 CXLS.
Thread of the screw-in part: M14x 1.25.
Gap between electrodes, mm: 0.7.
Block octane correction
The octane correction block is located on the left side of the engine compartment and ensures that the controller adapts the ignition timing depending on the octane number of the gasoline used. When the engine is running on gasoline with an octane rating of 95, through a block through a 2202 Ohm resistor, it closes to «mass» conclusion «15» controller, and when using gasoline with an octane rating of 98, this output closes to «mass» through a 750 ohm resistor.
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