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 V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSERVICE PRECAUTIONSELECTRONIC COMPONENT HANDLING
1987 Pontiac Firebird V8-350 5.7L
Electronic Component Handling
1987 Pontiac Firebird V8-350 5.7LSECTION Electronic Component Handling
STATIC DISCHARGE
^ Discharge any static electrical charges before handling electronic parts by touching ground or maintaining a ground connection to a bare skin area like the wrist.
^ Never touch the ECU connector pins, integrated circuit connector pins, or soldered components on the ECU circuit board.
TESTING
^ When measuring voltage at the control unit harness connector, disconnect harness connector with the ignition OFF, then turn ignition "ON" as necessary.
^ To prevent deforming control unit harness connectors, do not probe terminals directly. Instead, insert a pin from the harness side and perform measurements through pin.
CONTROL UNIT DAMAGE
^ Do not try to disassemble the control unit.
^ Before performing electrical welding (for instance, spot welding), disconnect the battery, climate control, injection, cruise control, ECU and radio.
^ If temperatures may exceed 80°C (176°F), (example: infra-red spray booth), remove all ECMs.
^ Avoid getting water on any of the Fuel and Engine Control System Components.
^ Never apply battery power to a component unless directed to do so in a test procedure.
^ Discharge any static electrical charges before handling electronic parts by touching ground or maintaining a ground connection to a bare skin area like the wrist.
^ Never touch the ECU connector pins, integrated circuit connector pins, or soldered components on the ECU circuit board.
TESTING
^ When measuring voltage at the control unit harness connector, disconnect harness connector with the ignition OFF, then turn ignition "ON" as necessary.
^ To prevent deforming control unit harness connectors, do not probe terminals directly. Instead, insert a pin from the harness side and perform measurements through pin.
CONTROL UNIT DAMAGE
^ Do not try to disassemble the control unit.
^ Before performing electrical welding (for instance, spot welding), disconnect the battery, climate control, injection, cruise control, ECU and radio.
^ If temperatures may exceed 80°C (176°F), (example: infra-red spray booth), remove all ECMs.
^ Avoid getting water on any of the Fuel and Engine Control System Components.
^ Never apply battery power to a component unless directed to do so in a test procedure.
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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.