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 MANUALSPONTIAC1990FIREBIRD TRANS AM, 5.0 F, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGBASIC IGNITION SYSTEM CHECKSHEI-EST DISTRIBUTORIGNITION COIL RESISTANCE (EXTERNALLY MOUNTED)
1990 Pontiac Firebird Trans Am, 5.0 F, Standard
Ignition Coil Resistance (Externally Mounted)
1990 Pontiac Firebird Trans Am, 5.0 F, StandardSECTION Ignition Coil Resistance (Externally Mounted)
- Remove coil connectors and secondary coil wire. In test "A", use high ohmmeter scale. See Fig 1 . Resistance value should be very high (infinite). If not, replace coil.
- In test "B", use low ohmmeter scale. Reading should be approximately zero ohms or replace coil. In test "C", use high ohmmeter scale. If there is no continuity, 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.