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 MANUALSBUICK1987REGAL GRAND NATIONALREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPIGNITION SYSTEM - HEI-ESTTESTINGIGNITION COIL RESISTANCE CHECKINTEGRALLY MOUNTED IGNITION COIL
1987 Buick Regal Grand National
Integrally Mounted Ignition Coil
1987 Buick Regal Grand NationalSECTION Integrally Mounted Ignition Coil
- Turn ignition off. Remove the distributor cap and coil assembly. See Fig 1. Set ohmmeter to low scale. Connect leads to coil "BAT" and "TACH" terminals. If resistance exceeds 1 ohm, replace ignition coil.
- Set ohmmeter on high scale. Connect one lead to coil secondary terminal and the other lead first to "TACH" terminal and then to ground terminal.
- If one reading is infinity and other is 6000-30,000 ohms, ignition coil is good. If resistance reading in BOTH instances is infinity, replace ignition 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.