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Home >> Jeep >> 1987 >> Comanche Chief, 2.5 H, RWD, AX5 >> Repair and Diagnosis >> Engine Performance >> System >> 4.0L MPI System >> Operation >> Electronic Spark Advance
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Electronic Spark Advance

Based upon engine operating conditions received from the sensors and switches, the ECU controls spark timing. The ECU triggers the ignition coil through the ignition control module.