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.
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HOMESERVICE MANUALSCHEVROLET1987FORWARD CONTROL 4.8 T, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - HEI (CARBURETED MODELS)COMPONENT TESTINGIGNITION COIL
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40
Ignition Coil
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40SECTION 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.
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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.