Excel L4-1468cc 1.5L SOHC (8 VALVE) (1986)
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Distributor Advance Unit: Description and Operation
Deceleration Spark Control System
The deceleration spark control system decreases hydrocarbon emissions during vehicle deceleration by advancing the ignition timing. Timing is
advanced by a solenoid operated vacuum valve on the distributor. The solenoid changes vacuum supplied to the valve from ported (carburetor) to full
manifold vacuum. The solenoid valve is controlled by the ECU based on engine speed.
