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Home >> Plymouth >> 1988 >> Colt DL, 2D Hatchback, 1.5 K, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Deceleration System >> Operation >> Deceleration Spark Control
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Deceleration Spark Control

Deceleration spark control system advances ignition timing by changing carburetor ported intake vacuum to intake manifold vacuum via a solenoid valve. See Figure . Solenoid valve is activated by engine speed sensor in the ECU.