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Home >> Chevrolet >> 1989 >> Forward Control 3.9 L, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Vacuum Advance Spark Control System >> Description >> Spark Vacuum Delay

Spark Vacuum Delay

Spark vacuum delay is used on 5.7L V8 engines with Heavy Duty emissions. Spark vacuum delay is installed between TVS check valve and distributor.