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 MANUALSCHEVROLET1994ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORDESCRIPTION AND OPERATION
1994 Chevrolet Astro Van M V6-262 4.3L VIN Z
Knock Sensor: Description and Operation
1994 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Description and Operation
Knock Sensor (KS) Circuit Diagram:
NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example. Refer to COMPUTERS AND CONTROL SYSTEMS/SCHEMATIC AND ROUTING DIAGRAMS for specific schematic applications.
PURPOSE:
The knock sensor is located in the engine block and sends a signal to the control module to retard ignition timing during a spark knock condition. When the knock sensor senses no more knocking the control module advances timing in small increments. This allows the control module to maintain maximum timing advance under various conditions.
RENDER: 1.0x
NO RELATED
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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.