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Home >> Cadillac >> 1982 >> Seville 4.1L Eng VIN 8 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> DFI Control System >> Operation >> Data Sensors >> Engine Speed Sensor
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Engine Speed Sensor

The engine speed sensor signal comes from 7 terminal HEI module in distributor. Pulses from distributor are sent to ECM where time between pulses is used to calculate engine speed. The ECM adds spark advance modifications to signal and sends this signal back to distributor.

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