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Home › Jeep › 1985 › Cherokee Base, 2D Utility, 2.1 B, Automatic › Repair and Diagnosis › Engine Performance › Ignition System › Ignition System - HEI › Overhaul › Reassembly › Reading Scope Primary Pattern:

Reading Scope Primary Pattern:

  1. A)

    Spark Zone - spark plug arcing.

  2. B)

    Coil and Condenser Zone

  3. B1)

    Firing Zone - no plug arc.

  4. C)

    Dwell Zone - displays current through coil primary with module turned on.
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