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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 43 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 5.7L.)ENGINE SENSORS & SWITCHESKNOCK SENSOR
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Knock Sensor
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Knock Sensor
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 1996 GMC Yukon, 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Suburban, and 1996 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect knock sensor harness connector. Using an ohmmeter, measure knock sensor resistance between sensor terminal and engine block. Resistance should be 3300-4500 ohms. Connect voltmeter between sensor terminal and ground. Set voltmeter to 2-volt AC scale.
- Start and idle engine. Tap on engine block near sensor. A signal should be indicated on voltmeter. If no signal is indicated, replace knock sensor. Also see TIMING CONTROL SYSTEMS under IGNITION SYSTEM and TESTS W/CODES - 5.7L article.
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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.