Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1986 Jeep Comanche Base, 2.8 W, 4WD, StandardFACTORY OEM SERVICE PROCEDURE
External Ignition Coil
- Connect ohmmeter leads to battery and "TACH" terminals. See Fig 1 . Primary resistance should read approximately zero. Attach leads to battery terminal and ground. An infinite reading indicates coil is okay.
- Connect ohmmeter leads to "TACH" and high voltage terminal. Use high resistance scale. If ohmmeter does not indicate below infinite resistance, coil must be replaced. See Fig 1 .
Factory Service Tools
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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.
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