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 MANUALSPONTIAC1991LEMANS LE, 2D HATCHBACK, AUTOMATIC, 3T40/MD9REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSHEI/EST IGNITION SYSTEMIGNITION COIL TESTING
1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9
Ignition Coil Testing
1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9SECTION Ignition Coil Testing
- Using an ohmmeter, check continuity between B+ terminal and base of ignition coil. See Figure . Reading should be infinite (open circuit). If reading is not infinite, replace coil.
- Check continuity between B+ terminal and "C" terminal. Reading should be low or zero (continuity). If reading is not low or zero, replace coil.
- Check continuity between C+ terminal and coil secondary terminal. If reading is infinite (open circuit), 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.