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 V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATIONELECTRONIC SPARK CONTROL (ESC)
1991 Pontiac Firebird V8-350 5.7L
Electronic Spark Control (ESC)
1991 Pontiac Firebird V8-350 5.7LSECTION Electronic Spark Control (ESC)
Chart C-5 Wiring Diagram:
The Electronic Spark Control (ESC) has two major components:
^ ESC Module (part of the MEM-CAL).
^ ESC knock sensor.
The ESC knock sensor detects abnormal vibration (spark knocking) in the engine. The sensor is mounted in the engine block near the cylinders. The sensor produces a AC output voltage which increases with the severity of the knock. This signal voltage inputs to the ECM. The ECM then adjust the Electronic Spark Timing (EST) to reduce spark knocking.
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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.