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HOMESERVICE MANUALSJEEP1986COMANCHE CUSTOM, 2.5 H, RWD, STANDARD, AX4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - SOLID STATETESTINGCOIL OUTPUT CHECK
1986 Jeep Comanche Custom, 2.5 H, RWD, Standard, AX4

Coil Output Check

1986 Jeep Comanche Custom, 2.5 H, RWD, Standard, AX4SECTION Coil Output Check

Connect oscilloscope to engine. Start engine and observe secondary voltage. Remove No. 2 spark plug wire from distributor cap to create open circuit. Run engine at 1000 RPM. Observe voltage on oscilloscope. The 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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.