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 MANUALSPONTIAC1991TRANS SPORT SE, 3T40/MD9REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGC-4, BASIC IGNITION SYSTEM CHECKS (GASOLINE)HEI-EST DISTRIBUTORIGNITION COIL POWER SOURCE
1991 Pontiac Trans Sport SE, 3T40/MD9
Ignition Coil Power Source
1991 Pontiac Trans Sport SE, 3T40/MD9SECTION Ignition Coil Power Source
- Turn ignition on. On models with remotely mounted ignition coil, use voltmeter to check voltage between terminal "B" of ignition coil and ground. If battery voltage does not exist, check for open circuit, blown ignition fuse or defective ignition switch.
- On models equipped with integrally mounted ignition coil, check voltage between BAT terminal and ground at distributor. If battery voltage does not exist, check for open circuit, blown ignition fuse or defective ignition switch.
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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.