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 MANUALSCHEVROLET1986CHEVY VAN G10, 4.3 N, AUTOMATIC, 475/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (EGR FUNCTION TESTING)EGR FUNCTION TESTINGDIESEL EGR
1986 Chevrolet Chevy Van G10, 4.3 N, Automatic, 475/M40
Diesel EGR
1986 Chevrolet Chevy Van G10, 4.3 N, Automatic, 475/M40SECTION Diesel EGR
WARNING: This page does not describe the selected car, but rather 196 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, 1995 GMC Yukon, and 1995 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
- Turn engine off. Disconnect vacuum hose to EGR valve. Connect a hand-held vacuum pump to EGR valve and apply 10 in. Hg. EGR pintle should move up and stay up for at least 20 seconds. If not, replace EGR valve.
- To check vacuum pump operation, connect vacuum gauge to vacuum inlet (small fitting). DO NOT plug or disconnect outlet fitting. With engine idling, vacuum should be at least 18 in Hg one minute after start. If not, check for belt slippage, vacuum leaks or other obvious defects. If vacuum reading is as specified, 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.