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 MANUALSCHEVROLET1990R 20 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORDESCRIPTION AND OPERATION
1990 Chevrolet R 20 P/U 2WD V8-350 5.7L
Knock Sensor: Description and Operation
1990 Chevrolet R 20 P/U 2WD V8-350 5.7LSECTION Description and Operation
ESC Wiring Diagram:
The Electronic Spark Control (ESC) system is comprised of a knock sensor, the ESC module, and the ECM. As the knock sensor detects engine knock, it sends a voltage signal to the ECM. The ECM responds by retarding the ignition timing until the knocking ceases. As detonation is reduced, the ECM advances the timing again in small increments back to the pre-programmed point for that engine speed and load.
RENDER: 1.0x
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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.