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Home >> Jeep >> 1985 >> Wagoneer Base, 2.8 W, Standard >> 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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