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.
1987 Chevrolet Hi-Cube 6.2 J, 400/M40FACTORY OEM SERVICE PROCEDURE
Ignition Coil
- Connect an ohmmeter between the negative terminal and the high voltage terminal. See Fig 1. Use high resistance scale. If ohmmeter does not indicate below infinite resistance, coil must be replaced.
- Connect ohmmeter between the positive terminal and coil frame (ground). Use the high resistance scale. If ohmmeter does not indicate infinite resistance, replace coil.
- Connect ohmmeter between positive and negative terminals. Use low resistance scale. Ohmmeter should indicate zero to one. If not, replace coil.
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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