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 MANUALSCHEVROLET1987BLAZER FULL SIZE V8-305 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORDESCRIPTION AND OPERATIONELECTRONIC SPARK CONTROL (ESC)
1987 Chevrolet Blazer Full Size V8-305 5.0L
Electronic Spark Control (ESC)
1987 Chevrolet Blazer Full Size V8-305 5.0LSECTION Electronic Spark Control (ESC)
Electronic Spark Control (ESC) is used on some models. The ESC system is used in conjunction with the EST system to provide additional spark retard during engine detonation. A knock sensor signals a separate ESC controller to retard the timing when it senses engine knock. The ESC controller signals the ECM which reduces spark advance until no more signals are received from the knock sensor.
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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.