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.
1987 Pontiac Fiero Base, Standard, MG3FACTORY OEM SERVICE PROCEDURE
ECM Operating Systems Controlled
- A/C
- Air Management
- Canister Purge
- Diagnostics: Check Engine Light, Data Output (ALCL) & Diagnostic Test Terminal (ALCL)
- Early Fuel Evaporation (EFE)
- Electric Fuel Pump
- Electronic Fuel Injection (TBI & Port)
- Electronic Spark Control (ESC)
- Electronic Spark Timing (EST)
- Engine Cooling Fan
- Exhaust Gas Recirculation (EGR)
- Fuel Control (M/C solenoid)
- Hood Louvre
- Idle Air Control (IAC)
- Idle Speed (ISC. ILC ISS)
- Transmission Converter Clutch (TCC)
- Turbo Wastegate
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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