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Home >> Jeep >> 1985 >> Scrambler Laredo, 4.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> Ignition System - Solid State >> Testing >> Coil Output Check
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Coil Output Check

  1. Connect oscilloscope to engine. Start engine and observe secondary winding spark voltage. Remove 1 spark plug wire (not wire No. 3 on 4-cylinder, No. 1 or 5 on 6-cylinder engine nor wire No. 3 or 4 on V8 engines) from distributor cap. Run engine at 1000 RPM.
  2. Observe voltage on oscilloscope. This voltage, referred to as open circuit voltage, should be 24,000 volts minimum.
NOTE: Do not operate engine with spark plug disconnected for more than 30 seconds or damage may result to catalytic converter.
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