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 MANUALSCHEVROLET2004EXPRESS 1500 RWD V6-4.3L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORSERVICE AND REPAIR
2004 Chevrolet Express 1500 RWD V6-4.3L VIN X
Knock Sensor: Service and Repair
2004 Chevrolet Express 1500 RWD V6-4.3L VIN XSECTION Service and Repair
KNOCK SENSOR (KS) REPLACEMENT
REMOVAL PROCEDURE
The knock sensor (KS) is located at the top rear of the engine.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Disconnect the KS harness connector (3).
4. Remove the KS bolt (1).
5. Remove the KS (2).
INSTALLATION PROCEDURE
NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.
1. Install the knock sensor (2) and bolt (1).
Tighten
Tighten the knock sensor bolt to 25 N.m (18 lb ft).
2. Connect the KS harness connector (3).
3. Install the engine cover.
REMOVAL PROCEDURE
The knock sensor (KS) is located at the top rear of the engine.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Disconnect the KS harness connector (3).
4. Remove the KS bolt (1).
5. Remove the KS (2).
INSTALLATION PROCEDURE
NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.
1. Install the knock sensor (2) and bolt (1).
Tighten
Tighten the knock sensor bolt to 25 N.m (18 lb ft).
2. Connect the KS harness connector (3).
3. Install the engine cover.
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.