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.
2000 Chevrolet Express 3/4 Ton Van V8-305 5.0L VIN M SFIFACTORY OEM SERVICE PROCEDURE
Ignition 1 on
YES/NO:
The ignition 1 ON parameter indicates when the VCM is detecting Ignition voltage. The normal ignition voltage is approximately 13.8 volts, but may vary between 11-16 volts. The VCM monitors the ignition voltage to compensate for low voltage operation of the injectors and to increase the dwell time of the ignition coil.
The ignition 1 ON parameter indicates when the VCM is detecting Ignition voltage. The normal ignition voltage is approximately 13.8 volts, but may vary between 11-16 volts. The VCM monitors the ignition voltage to compensate for low voltage operation of the injectors and to increase the dwell time of the ignition coil.
Factory Service Tools
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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.
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