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Home >> Opel >> 1978 >> Opel 4D Sedan, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Coasting Richer System >> Operation >> Engine Speed Sensor >> 1976-78 California Models

1976-78 California Models

Engine speed sensor detects engine RPM by sensing pulses from ignition coil. When engine speed exceeds 1600 RPM, engine speed sensor turns on and coasting richer solenoid valve may be energized.

Fig 1: 1976-78 Coasting Richer System (California Models)
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