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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 5.0L)EMISSION SYSTEMS & SUB-SYSTEMSEXHAUST GAS RECIRCULATIONEXHAUST GAS RECIRCULATION (EGR) SYSTEM CHECK
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Exhaust Gas Recirculation (EGR) System Check
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Exhaust Gas Recirculation (EGR) System Check
WARNING: This page is about a different car, the 1998 GMC Savana, 1998 Chevrolet Chevy Van, and 1998 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES - 5.0L article.
- Remove heated oxygen sensor. Install exhaust backpressure tester in place of oxygen sensor. Start engine and let idle. If pressure reading is not 1.25 psi or greater, go to next step. If pressure reading is within specification, go to step 4).
- Increase engine speed to 2000 RPM on all engines. If pressure reading is greater than 3 psi (.2 kg/cm2 ) on all engines, go to next step. If pressure reading is not within specification, go to step 6).
- Check exhaust system for crushed pipe, internal muffler damage or heat distress. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 6).
- Replace catalytic converter and go to next step.
- Operate vehicle within conditions under which original symptom was noted. If system operate properly, system is okay at this time. If system does not operate properly, go to step 2).
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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.