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 MANUALSPONTIAC1991FIREBIRD FORMULA, 5.0 F, STANDARD, M39REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (ENGINE CONTROLS - TESTS W/CODES - 5.7L PFI)PCM/BCM CODE CHARTSCODE 35, IAC IDLE SPEED ERROR, W/O TECH 1PCV VALVE
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39
PCV Valve
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION PCV Valve
WARNING: This page is about a different car, the 1992 Pontiac Firebird, 1992 Chevrolet Corvette, and 1992 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
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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.