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 MANUALSCHEVROLET1995CHEVY VAN G30, VAN CARGO EXTENDED, 6.5 YREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 7.4LIGNITION SYSTEMTIMING CONTROL SYSTEMS (C-4 & C-5)C-5, KNOCK SENSOR CIRCUIT (MODELS USING KNOCK SENSOR WITH INTERNAL SPARK CONTROLLER MODULE)
1995 Chevrolet Chevy Van G30, Van Cargo Extended, 6.5 Y
C-5, Knock Sensor Circuit (Models Using Knock Sensor With Internal Spark Controller Module)
1995 Chevrolet Chevy Van G30, Van Cargo Extended, 6.5 YSECTION C-5, Knock Sensor Circuit (Models Using Knock Sensor With Internal Spark Controller Module)
- An open or short circuit on knock sensor wire to ECM/PCM/VCM will set a related trouble code. A false detonation signal will not cause ECM/PCM/VCM to set a code.
- If a scan tester is available, connect it to Data Link Connector (DLC). Tap on engine next to knock sensor and note "knock" parameter. Knock should be indicated on scan tester.
- If a scan tester is not available, connect tachometer to engine. Start engine and hold RPM above idle. Using a metal object, tap on engine close to knock sensor. A noticeable decrease in engine RPM should occur. If no RPM decrease occurred, check knock sensor to ECM/PCM/VCM circuit.
- On vehicles equipped with automatic transmission, it may be necessary to place transmission in Drive for timing change to occur. See KNOCK SENSOR under ENGINE SENSORS & SWITCHES.
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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.