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
EGR Duty Cycle
RANGE (0-100 PERCENT):
The EGR duty cycle determines the percentage of time the EGR valves control circuit has 12 volts applied to it. This is a method to control the current applied to the valve motor. As duty cycle increases, so does current which forces the valve to open further and allow more exhaust gas to enter the intake. One hundred percent duty cycle would indicate a fully opened valve.
The EGR duty cycle determines the percentage of time the EGR valves control circuit has 12 volts applied to it. This is a method to control the current applied to the valve motor. As duty cycle increases, so does current which forces the valve to open further and allow more exhaust gas to enter the intake. One hundred percent duty cycle would indicate a fully opened valve.
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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