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 FORMULA, 5.0 F, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL CONTROL (CARBURETED)HOT AIR CHOKE
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8
Hot Air Choke
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8SECTION Hot Air Choke
- Warm engine to normal operating temperature. Check choke valve. Choke valve should be fully open. If choke is not fully opened, touch choke housing and hot air inlet pipe or hose to determine if sufficient heat is reaching choke thermostatic spring.
- If choke housing or hot air inlet pipe is not getting hot, check choke housing, choke heat pipe or manifold choke heat stove for restricted passages. Repair or replace components.
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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.