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 MANUALSPONTIAC1987FIERO BASE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETHEORY AND OPERATIONCCC THEORY/OPERATION
1987 Pontiac Fiero Base, Automatic
CCC Theory/Operation
1987 Pontiac Fiero Base, AutomaticSECTION CCC Theory/Operation
- Vehicle Identification
- Description
- Operation
- System Overview
- ECM Operating Conditions Sensed
- ECM Operating Systems Controlled
- Fuel Control (CARBURETED Models)
- Fuel Control Operation (Fuel Injected Models)
- Data Sensors
- Notes
- Air Conditioner "On" Switch
- Barometric Pressure Sensor (BARO)
- Coolant Temperature Sensor (CTS)
- Crank Signal
- E-Cell Timer
- High Gear Switch
- Mass Air Flow Sensor (MAF)
- Manifold Absolute Pressure Sensor (MAP)
- Manifold Air Temperature Sensor (MAT)
- Oxygen Sensor (O2)
- Park/Neutral Switch (P/N)
- Throttle Position Sensor (TPS)
- Vacuum Sensor
- Vehicle Speed Sensor (VSS)
- Electronic Control Module (ECM)
- Ignition Timing Operation
- Idle Air Control (IAC) Valve
- Idle Speed Control (ISC) (CARBURETED Models)
- Idle Speed Module (2.0L TBI Engine - 1986-87)
- Emission Control
- Torque Converter Clutch (TCC)
- Diagnostic System
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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.