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 MANUALSCHEVROLET1985CHEVY VAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (EGR FUNCTION TESTING - GENERAL MOTORS TRUCKS)EGR FUNCTION TESTING - GENERAL MOTORS TRUCKSTEST 2LINEAR EGR
1985 Chevrolet Chevy Van G20, 6.2 C, Standard
Linear EGR
1985 Chevrolet Chevy Van G20, 6.2 C, StandardSECTION Linear EGR
WARNING: This page is about a different variant/trim than selected.
- Install scan tool. Ensure P/N switch is operating properly. With engine at normal operating temperature, command EGR pintle position to zero percent. Increase engine speed to 2000 RPM. If scan tool reads actual EGR pintle position at greater than 3 percent, EGR valve is stuck open. Replace EGR valve.
- If scan tool reads actual EGR pintle position at 3 percent or less, command a 25 percent position step increase (i.e., 0-25 percent, 25-50 percent, 50-75 percent, etc.). Observe MAP sensor reading and actual EGR pintle position for 3 seconds. EGR should increase by about 25 percent and MAP reading should also increase.
- If actual EGR pintle position is stable and within 10 percent position of desired EGR pintle position command after 2 seconds, go to next step. If actual EGR pintle position is not as specified, go to step 5.
- MAP reading should have increased when EGR pintle responded. If MAP did not respond, check EGR passages and EGR valve for blockage. If MAP responded, set desired EGR pintle position to 100 percent. If EGR pintle position sets to 100 percent, EGR is okay. If not, replace EGR valve.
- Turn engine off. Check EGR electrical circuit and connecting components. Turn ignition on, check 5-volt reference voltage on harness connector terminal "D" (Gray wire). If 5-volt reference voltage is not present, check ECM. If circuits are okay, replace EGR valve.
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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.