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 MANUALSPONTIAC1987FIREBIRD FORMULA, 5.0 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM5.0L FEEDBACK CARBURETOR TESTS W/CODESCODE 51 - PROM
1987 Pontiac Firebird Formula, 5.0 H, Automatic
Code 51 - Prom
1987 Pontiac Firebird Formula, 5.0 H, AutomaticSECTION Code 51 - Prom
Code 51 sets if any of the following occur:
- Faulty PROM unit.
- PROM unit improperly installed (may not set a code if installed backward).
- Some PROM pins not making contact (i.e. bent).
Ensure PROM pins are not bent and are inserted properly into ECM. Ensure PROM is installed in proper direction as shown in chart.
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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.